canvas

package
v0.1.0 Latest Latest
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 Go to latest Published: Jul 24, 2024 License: BSD-3-Clause Imports: 43 Imported by: 0

README

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Cogent Canvas is a Cogent Core based SVG vector drawing program, with design based on Inkscape.

Behavior

  • multiple select actions keep doing down even inside groups, so it is easy to operate inside groups but group is the "default"

  • Alt on control knobs -> rotate instead of clicking again to get rotation knobs -- this is compatible with above and better :)

Install

The simple Go install command should work:

$ go install cogentcore.org/cogent/canvas/cmd/canvas@main

Exporting PNG and PDF depends on https://inkscape.org -- on the Mac you need to make a link to /usr/local/bin and likewise for Linux:

$ sudo ln -s /Applications/Inkscape.app/Contents/MacOS/inkscape /usr/local/bin/

Design

Similar to inkscape in overall layout, and read / write inkscape compatible SVG files.

  • Main horiz toolbar(s) across top -- top one is static, bottom one is dynamic based on selection / tool mode.

  • Left vert toolbar with drawing tools

  • Left panel with drawing structure. This is just like GiEditor tree -- provides direct access as needed. In particular this provides layer-level organization -- always have a layer group by default, and can drag items into different layers, and also have view and freeze flags on layers. usu only show layer level, and selection there determines which layer things are added to!

  • Main middle panel with drawing. Grid underlay is a separate image that is drawn first, updated with any changes.

  • Right tab panel with all the controls, just like gide in terms of tab & Inkscape overall. tabs are easier to find vs. inkscape.

  • code in main grid package provides all the editors for right tabs.

Status

Basic functionality now in place:

  • create: rect, ellipse, line, text, import image

  • full basic paint settings (gradients, markers, etc), and text properties, editing

  • dynamic guide alignment, Align panel

  • basic node editor -- can move the main points, not the extra control points

  • full undo / redo for everything.

  • Settings

TODO:

  • double-click on text brings up text bar and text panel

  • add more layer logic -- if layers, everything should be in a layer?

  • import svg -- same as marker

  • add group / ungroup to context menu (conditional on selection n etc)

  • implement the full transform panel

  • render gradient icons

  • show selected path node in diff color.. red? node sel map

  • rest of line properties -- easy

  • dropper = grab style from containsnode, apply to selection -- don't affect selection!

  • svg.Node ToPath -- convert any node to a path

  • node editor -- big job but needed for making basic bezier curves..

  • esc aborts new el drag

  • add distribute to Align

  • svg.Text align Center, etc affects different tspans within overall text block

  • Text edit panel -- finish toolbar

  • cut / paste not updating tree reliably. more tree update debugging fun!

  • use grid itself to render all new icons!

  • figure out mask clipping eventually.

Inkscape special flags

https://wiki.inkscape.org/wiki/index.php/Inkscape_SVG_vs._plain_SVG

Documentation

Overview

Package canvas implements a 2D vector graphics program.

Index

Constants

This section is empty.

Variables

View Source 
var (
	HandleSpriteScale = float32(18)
	HandleSizeMin     = 4
	HandleBorderMin   = 2
)
View Source 
var (
	LineSpriteScale = float32(8)
	LineSizeMin     = 3
	LineBorderMin   = 1
)
View Source 
var ActionHelpMap = map[Actions]string{
	Move:    "<b>Alt</b> = move without snapping, <b>Ctrl</b> = constrain to axis with smallest delta",
	Reshape: "<b>Alt</b> = rotate, <b>Ctrl</b> = constraint to axis with smallest delta",
}

ActionHelpMap contains a set of help strings for different actions which are the names given e.g., in the ActStart, SaveUndo etc.

View Source 
var AlignIcons = map[Aligns]icons.Icon{AlignRightAnchor: cicons.AlignRightAnchor, AlignLeft: cicons.AlignLeft, AlignCenter: cicons.AlignCenter, AlignRight: cicons.AlignRight, AlignLeftAnchor: cicons.AlignLeftAnchor, AlignBaselineHoriz: cicons.AlignBaselineHoriz, AlignBottomAnchor: cicons.AlignBottomAnchor, AlignTop: cicons.AlignTop, AlignMiddle: cicons.AlignMiddle, AlignBottom: cicons.AlignBottom, AlignTopAnchor: cicons.AlignTopAnchor, AlignBaselineVert: cicons.AlignBaselineVert}
View Source 
var AllDashIcons []icons.Icon

AllDashIcons contains all of the available dash names as Icons -- for chooser.

View Source 
var AllDashNames []string

AllDashNames contains all of the available dash names. it is initialized from StdDashNames.

View Source 
var AllDashesMap map[string][]float64

AllDashesMap contains all of the available Dashes. it is initialized from StdDashesMap

View Source 
var AllMarkerIcons []icons.Icon

AllMarkerIcons contains all of the available marker names as Icons -- for chooser. All names have marker- prefix in addition to regular marker names.

View Source 
var AllMarkerNames []string

AllMarkerNames contains all of the available marker names. it is initialized from StdMarkerNames.

View Source 
var AllMarkersSVGMap map[string]*svg.Marker

AllMarkersSVGMap contains all of the available Markers as *svg.Marker elements that have been converted from the XML source.

View Source 
var AllMarkersXMLMap map[string]string

AllMarkersXMLMap contains all of the available Markers as XML source. It is initialized from StdMarkersMap

View Source 
var AvailableSplitNames []string

AvailableSplitNames are the names of the current AvailableSplits -- used for some choosers

View Source 
var AvailableSplitsChanged = false

AvailableSplitsChanged is used to update toolbars via following menu, toolbar properties update methods -- not accurate if editing any other map but works for now..

View Source 
var DashIconsInited = false

DashIconsInited records whether the dashes have been initialized into Icons for use in selectors: see DashIconsInit()

View Source 
var MarkerIconsInited = false

MarkerIconsInited records whether the dashes have been initialized into Icons for use in selectors: see MarkerIconsInit()

View Source 
var Settings = &SettingsData{
	SettingsBase: core.SettingsBase{
		Name: "Canvas",
		File: filepath.Join(core.TheApp.DataDir(), "Cogent Canvas", "settings.toml"),
	},
}

Settings are the overall Code settings

View Source 
var SplitsSettingsFilename = "splits-settings.json"

SplitsSettingsFilename is the name of the settings file in App prefs directory for saving / loading the default AvailSplits

View Source 
var SpriteNames = map[Sprites]string{
	SpBBoxUpL: "up-l",
	SpBBoxUpC: "up-c",
	SpBBoxUpR: "up-r",
	SpBBoxDnL: "dn-l",
	SpBBoxDnC: "dn-c",
	SpBBoxDnR: "dn-r",
	SpBBoxLfM: "lf-m",
	SpBBoxRtM: "rt-m",

	SpReshapeBBox: "reshape-bbox",

	SpSelBBox: "sel-bbox",

	SpNodePoint: "node-point",
	SpNodeCtrl:  "node-ctrl",

	SpRubberBand: "rubber-band",

	SpAlignMatch: "align-match",
}

SpriteNames are name strings to use for naming sprites

View Source 
var StandardDashNames = []string{
	"dash-solid",
	"dash-1-1",
	"dash-1-2",
	"dash-1-3",
	"dash-1-4",
	"dash-1-6",
	"dash-1-8",
	"dash-1-12",
	"dash-1-24",
	"dash-1-48",
	"dash-empty",
	"dash-2-1",
	"dash-3-1",
	"dash-4-1",
	"dash-6-1",
	"dash-8-1",
	"dash-12-1",
	"dash-24-1",
	"dash-2-2",
	"dash-3-3",
	"dash-4-4",
	"dash-6-6",
	"dash-8-8",
	"dash-12-12",
	"dash-24-24",
	"dash-2-4",
	"dash-4-2",
	"dash-2-6",
	"dash-6-2",
	"dash-4-8",
	"dash-8-4",
	"dash-2-1-012-1",
	"dash-4-2-1-2",
	"dash-8-2-1-2",
	"dash-012-012",
	"dash-014-014",
	"dash-0110-0110",
}

StandardDashNames are standard dash patterns

View Source 
var StandardDashesMap = map[string][]float64{
	"dash-solid":     {},
	"dash-1-1":       {1, 1},
	"dash-1-2":       {1, 2},
	"dash-1-3":       {1, 3},
	"dash-1-4":       {1, 4},
	"dash-1-6":       {1, 6},
	"dash-1-8":       {1, 8},
	"dash-1-12":      {1, 12},
	"dash-1-24":      {1, 24},
	"dash-1-48":      {1, 48},
	"dash-empty":     {0, 11},
	"dash-2-1":       {2, 1},
	"dash-3-1":       {3, 1},
	"dash-4-1":       {4, 1},
	"dash-6-1":       {6, 1},
	"dash-8-1":       {8, 1},
	"dash-12-1":      {12, 1},
	"dash-24-1":      {24, 1},
	"dash-2-2":       {2, 2},
	"dash-3-3":       {3, 3},
	"dash-4-4":       {4, 4},
	"dash-6-6":       {6, 6},
	"dash-8-8":       {8, 8},
	"dash-12-12":     {12, 12},
	"dash-24-24":     {24, 24},
	"dash-2-4":       {2, 4},
	"dash-4-2":       {4, 2},
	"dash-2-6":       {2, 6},
	"dash-6-2":       {6, 2},
	"dash-4-8":       {4, 8},
	"dash-8-4":       {8, 4},
	"dash-2-1-012-1": {2, 1, 0.5, 1},
	"dash-4-2-1-2":   {4, 2, 1, 2},
	"dash-8-2-1-2":   {8, 2, 1, 2},
	"dash-012-012":   {0.5, 0.5},
	"dash-014-014":   {0.25, 0.25},
	"dash-0110-0110": {0.1, 0.1},
}

StandardDashesMap are standard dash patterns

View Source 
var StandardMarkerNames = []string{
	"-",

	"Arrow1Sstart",
	"Arrow1Send",
	"Arrow1Mstart",
	"Arrow1Mend",
	"Arrow1Lstart",
	"Arrow1Lend",

	"Arrow2Sstart",
	"Arrow2Send",
	"Arrow2Mstart",
	"Arrow2Mend",
	"Arrow2Lstart",
	"Arrow2Lend",

	"Tail",

	"DistanceStart",
	"DistanceEnd",

	"DotS",
	"DotM",
	"DotL",

	"SquareS",
	"SquareM",
	"SquareL",

	"DiamondS",
	"DiamondM",
	"DiamondL",

	"DiamondSstart",
	"DiamondSend",
	"DiamondMstart",
	"DiamondMend",
	"DiamondLstart",
	"DiamondLend",

	"EmptyDiamondS",
	"EmptyDiamondM",
	"EmptyDiamondL",

	"EmptyDiamondSstart",
	"EmptyDiamondSend",
	"EmptyDiamondMstart",
	"EmptyDiamondMend",
	"EmptyDiamondLstart",
	"EmptyDiamondLend",

	"TriangleInS",
	"TriangleInM",
	"TriangleInL",

	"TriangleOutS",
	"TriangleOutM",
	"TriangleOutL",

	"EmptyTriangleInS",
	"EmptyTriangleInM",
	"EmptyTriangleInL",

	"EmptyTriangleOutS",
	"EmptyTriangleOutM",
	"EmptyTriangleOutL",

	"StopS",
	"StopM",
	"StopL",

	"SemiCircleIn",
	"SemiCircleOut",

	"CurveIn",
	"CurveOut",
	"CurvyCross",

	"Scissors",
	"Legs",
	"Torso",
	"Club",
	"RazorWire",

	"InfiniteLineStart",
	"InfiniteLineEnd",
}

StandardMarkerNames is an ordered list of marker names

View Source 
var StandardMarkersMap = map[string]string{
	"-": "",
	"Arrow1Lstart": `<marker style="overflow:visible" id="Arrow1Lstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Lstart">
      <path transform="scale(0.8) translate(12.5,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,
	"Arrow1Lend": `<marker style="overflow:visible;" id="Arrow1Lend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Lend">
      <path transform="scale(0.8) rotate(180) translate(12.5,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt;" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,

	"Arrow1Mstart": `<marker style="overflow:visible" id="Arrow1Mstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Mstart">
      <path transform="scale(0.4) translate(10,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,
	"Arrow1Mend": `<marker style="overflow:visible;" id="Arrow1Mend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Mend">
      <path transform="scale(0.4) rotate(180) translate(10,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt;" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,

	"Arrow1Sstart": `<marker style="overflow:visible" id="Arrow1Sstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Sstart">
      <path transform="scale(0.2) translate(6,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,
	"Arrow1Send": `<marker style="overflow:visible;" id="Arrow1Send" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow1Send">
      <path transform="scale(0.2) rotate(180) translate(6,0)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt;" d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "/>
    </marker>`,

	"Arrow2Lstart": `<marker style="overflow:visible" id="Arrow2Lstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Lstart">
      <path transform="scale(1.1) translate(1,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round"/>
    </marker>`,
	"Arrow2Lend": `<marker style="overflow:visible;" id="Arrow2Lend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Lend">
      <path transform="scale(1.1) rotate(180) translate(1,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round;"/>
    </marker>`,

	"Arrow2Mstart": `<marker style="overflow:visible" id="Arrow2Mstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Mstart">
      <path transform="scale(0.6) translate(0,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round"/>
    </marker>`,
	"Arrow2Mend": `<marker style="overflow:visible;" id="Arrow2Mend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Mend">
      <path transform="scale(0.6) rotate(180) translate(0,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round;"/>
    </marker>`,

	"Arrow2Sstart": `<marker style="overflow:visible" id="Arrow2Sstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Sstart">
      <path transform="scale(0.3) translate(-2.3,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round"/>
    </marker>`,
	"Arrow2Send": `<marker style="overflow:visible;" id="Arrow2Send" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Arrow2Send">
      <path transform="scale(0.3) rotate(180) translate(-2.3,0)" d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z " style="fill-rule:evenodd;fill:context-stroke;stroke-width:0.62500000;stroke-linejoin:round;"/>
    </marker>`,

	"Tail": `<marker style="overflow:visible" id="Tail" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Tail">
      <g transform="scale(-1.2)">
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -3.8048674,-3.9585227 L 0.54352094,0"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -1.2866832,-3.9585227 L 3.0617053,0"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M 1.3053582,-3.9585227 L 5.6537466,0"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -3.8048674,4.1775838 L 0.54352094,0.21974226"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M -1.2866832,4.1775838 L 3.0617053,0.21974226"/>
        <path style="fill:none;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.8;stroke-linecap:round" d="M 1.3053582,4.1775838 L 5.6537466,0.21974226"/>
      </g>
    </marker>`,

	"DistanceStart": `<marker inkscape:stockid="DistanceStart" orient="auto" refY="0.0" refX="0.0" id="DistanceStart" style="overflow:visible">
      <g id="g2300">
        <path id="path2306" d="M 0,0 L 2,0" style="fill:none;stroke:context-fill;stroke-width:1.15;stroke-linecap:square"/>
        <path id="path2302" d="M 0,0 L 13,4 L 9,0 13,-4 L 0,0 z " style="fill:context-stroke;fill-rule:evenodd;stroke:none"/>
        <path id="path2304" d="M 0,-4 L 0,40" style="fill:none;stroke:context-stroke;stroke-width:1;stroke-linecap:square"/>
      </g>
    </marker>`,
	"DistanceEnd": `<marker inkscape:stockid="DistanceEnd" orient="auto" refY="0.0" refX="0.0" id="DistanceEnd" style="overflow:visible">
      <g id="g2301">
        <path id="path2316" d="M 0,0 L -2,0" style="fill:none;stroke:context-fill;stroke-width:1.15;stroke-linecap:square"/>
        <path id="path2312" d="M 0,0 L -13,4 L -9,0 -13,-4 L 0,0 z " style="fill:context-stroke;fill-rule:evenodd;stroke:none"/>
        <path id="path2314" d="M 0,-4 L 0,40" style="fill:none;stroke:context-stroke;stroke-width:1;stroke-linecap:square"/>
      </g>
    </marker>`,

	"DotL": `<marker style="overflow:visible" id="DotL" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DotL">
      <path transform="scale(0.8) translate(7.4, 1)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -2.5,-1.0 C -2.5,1.7600000 -4.7400000,4.0 -7.5,4.0 C -10.260000,4.0 -12.5,1.7600000 -12.5,-1.0 C -12.5,-3.7600000 -10.260000,-6.0 -7.5,-6.0 C -4.7400000,-6.0 -2.5,-3.7600000 -2.5,-1.0 z "/>
    </marker>`,
	"DotM": `<marker style="overflow:visible" id="DotM" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DotM">
      <path transform="scale(0.4) translate(7.4, 1)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -2.5,-1.0 C -2.5,1.7600000 -4.7400000,4.0 -7.5,4.0 C -10.260000,4.0 -12.5,1.7600000 -12.5,-1.0 C -12.5,-3.7600000 -10.260000,-6.0 -7.5,-6.0 C -4.7400000,-6.0 -2.5,-3.7600000 -2.5,-1.0 z "/>
    </marker>`,
	"DotS": `<marker style="overflow:visible" id="DotS" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DotS">
      <path transform="scale(0.2) translate(7.4, 1)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -2.5,-1.0 C -2.5,1.7600000 -4.7400000,4.0 -7.5,4.0 C -10.260000,4.0 -12.5,1.7600000 -12.5,-1.0 C -12.5,-3.7600000 -10.260000,-6.0 -7.5,-6.0 C -4.7400000,-6.0 -2.5,-3.7600000 -2.5,-1.0 z "/>
    </marker>`,

	"SquareL": `<marker style="overflow:visible" id="SquareL" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="SquareL">
      <path transform="scale(0.8)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -5.0,-5.0 L -5.0,5.0 L 5.0,5.0 L 5.0,-5.0 L -5.0,-5.0 z "/>
    </marker>`,
	"SquareM": `<marker style="overflow:visible" id="SquareM" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="SquareM">
      <path transform="scale(0.4)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -5.0,-5.0 L -5.0,5.0 L 5.0,5.0 L 5.0,-5.0 L -5.0,-5.0 z "/>
    </marker>`,
	"SquareS": `<marker style="overflow:visible" id="SquareS" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="SquareS">
      <path transform="scale(0.2)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M -5.0,-5.0 L -5.0,5.0 L 5.0,5.0 L 5.0,-5.0 L -5.0,-5.0 z "/>
    </marker>`,

	"DiamondL": `<marker style="overflow:visible" id="DiamondL" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="DiamondL">       
      <path transform="scale(0.8)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:1.0pt" d="M 0,-7.0710768 L -7.0710894,0 L 0,7.0710589 L 7.0710462,0 L 0,-7.0710768 z "/>
    </marker>`,
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        <path style="fill:#ff0000;fill-opacity:0.75000000;fill-rule:evenodd;stroke:context-stroke;stroke-width:1.0000000pt" d="M 16.779951 -28.685045 A 0.60731727 0.60731727 0 1 0 15.565317,-28.685045 A 0.60731727 0.60731727 0 1 0 16.779951 -28.685045 z" transform="matrix(0,-1.109517,1.109517,0,25.96648,19.71619)"/>
        <path style="fill:#ff0000;fill-opacity:0.75000000;fill-rule:evenodd;stroke:context-stroke;stroke-width:1.0000000pt" d="M 16.779951 -28.685045 A 0.60731727 0.60731727 0 1 0 15.565317,-28.685045 A 0.60731727 0.60731727 0 1 0 16.779951 -28.685045 z" transform="matrix(0,-1.109517,1.109517,0,26.82450,16.99126)"/>
      </g>
    </marker>`,

	"Club": `<marker style="overflow:visible" id="Club" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Club">
      <path transform="scale(0.6)" style="fill-rule:evenodd;fill:context-stroke;stroke:context-stroke;stroke-width:0.74587913pt" d="M -1.5971367,-7.0977635 C -3.4863874,-7.0977635 -5.0235187,-5.5606321 -5.0235187,-3.6713813 C -5.0235187,-3.0147015 -4.7851656,-2.4444556 -4.4641095,-1.9232271 C -4.5028609,-1.8911157 -4.5437814,-1.8647646 -4.5806531,-1.8299921 C -5.2030765,-2.6849849 -6.1700514,-3.2751330 -7.3077730,-3.2751330 C -9.1970245,-3.2751331 -10.734155,-1.7380016 -10.734155,0.15124914 C -10.734155,2.0404999 -9.1970245,3.5776313 -7.3077730,3.5776313 C -6.3143268,3.5776313 -5.4391540,3.1355702 -4.8137404,2.4588126 C -4.9384274,2.8137041 -5.0235187,3.1803000 -5.0235187,3.5776313 C -5.0235187,5.4668819 -3.4863874,7.0040135 -1.5971367,7.0040135 C 0.29211394,7.0040135 1.8292454,5.4668819 1.8292454,3.5776313 C 1.8292454,2.7842354 1.5136868,2.0838028 1.0600576,1.5031550 C 2.4152718,1.7663868 3.7718375,2.2973711 4.7661444,3.8340272 C 4.0279463,3.0958289 3.5540908,1.7534117 3.5540908,-0.058529361 L 2.9247554,-0.10514681 L 3.5074733,-0.12845553 C 3.5074733,-1.9403966 3.9580199,-3.2828138 4.6962183,-4.0210121 C 3.7371277,-2.5387813 2.4390549,-1.9946496 1.1299838,-1.7134486 C 1.5341802,-2.2753578 1.8292454,-2.9268556 1.8292454,-3.6713813 C 1.8292454,-5.5606319 0.29211394,-7.0977635 -1.5971367,-7.0977635 z "/>
    </marker>`,

	"RazorWire": `<marker style="overflow:visible" orient="auto" refY="0" refX="0" id="RazorWire" inkscape:stockid="RazorWire">
      <path d="M 0.022727273,-0.74009011 L 0.022727273,0.69740989 L -7.7585227,3.0099099 L 10.678977,3.0099099 L 3.4914773,0.69740989 L 3.4914773,-0.74009011 L 10.741477,-2.8963401 L -7.7272727,-2.8963401 L 0.022727273,-0.74009011 z " style="fill:#808080;fill-opacity:1;fill-rule:evenodd;stroke:context-stroke;stroke-width:0.1pt" transform="scale(0.8,0.8)"/>
    </marker>`,

	"InfiniteLineEnd": `<marker orient="auto" refY="0" refX="0" id="InfiniteLineEnd" inkscape:stockid="InfiniteLineEnd" style="overflow:visible">
      <g style="fill:context-stroke">
        <circle cx="3" cy="0" r="0.8"/>
        <circle cx="6.5" cy="0" r="0.8"/>
        <circle cx="10" cy="0" r="0.8"/>
      </g>
    </marker>`,
	"InfiniteLineStart": `<marker orient="auto" refY="0" refX="0" id="InfiniteLineStart" inkscape:stockid="InfiniteLineStart" style="overflow:visible">
      <g transform="translate(-13,0)" style="fill:context-stroke">
        <circle cx="3" cy="0" r="0.8"/>
        <circle cx="6.5" cy="0" r="0.8"/>
        <circle cx="10" cy="0" r="0.8"/>
      </g>
    </marker>`,
}

StandardMarkersMap is a map of the standard markers

View Source 
var StandardSizesMap = map[StandardSizes]*StandardSizeValues{
	Img1280x720:  {units.UnitPx, 1280, 720},
	Img1920x1080: {units.UnitPx, 1920, 1080},
	Img3840x2160: {units.UnitPx, 3840, 2160},
	Img7680x4320: {units.UnitPx, 7680, 4320},
	Img1024x768:  {units.UnitPx, 1024, 768},
	Img720x480:   {units.UnitPx, 720, 480},
	Img640x480:   {units.UnitPx, 640, 480},
	Img320x240:   {units.UnitPx, 320, 240},
	A4:           {units.UnitMm, 210, 297},
	USLetter:     {units.UnitPt, 612, 792},
	USLegal:      {units.UnitPt, 612, 1008},
	A0:           {units.UnitMm, 841, 1189},
	A1:           {units.UnitMm, 594, 841},
	A2:           {units.UnitMm, 420, 594},
	A3:           {units.UnitMm, 297, 420},
	A5:           {units.UnitMm, 148, 210},
	A6:           {units.UnitMm, 105, 148},
	A7:           {units.UnitMm, 74, 105},
	A8:           {units.UnitMm, 52, 74},
	A9:           {units.UnitMm, 37, 52},
	A10:          {units.UnitMm, 26, 37},
}

StandardSizesMap is the map of size values for each standard size

View Source 
var StandardSplits = Splits{
	{"Code", "2 text views, tabs", []float32{.1, .325, .325, .25}},
	{"Small", "1 text view, tabs", []float32{.1, .5, 0, .4}},
	{"BigTabs", "1 text view, big tabs", []float32{.1, .3, 0, .6}},
	{"Debug", "big command panel for debugging", []float32{0.1, 0.3, 0.3, 0.3}},
}

StandardSplits is the original compiled-in set of standard named splits.

Functions

func AddNewDash 

func AddNewDash(dary []float64) string

AddNewDash adds new dash pattern to available list, creating name based on pattern, which is returned. the given array is copied before storing, just in case.

func BBoxReshapeDelta 

func BBoxReshapeDelta(bb *math32.Box2, delta float32, bbX, bbY BBoxPoints)

BBoxReshapeDelta moves given target dimensions by delta amounts

func DashIconsInit 

func DashIconsInit()

DashIconsInit ensures that the dashes have been turned into icons for selectors, with same name (dash- prefix). Call this after startup, when configuring a gui element that needs it.

func DashMatchArray 

func DashMatchArray(lwidth float64, dary []float64) (bool, string)

DashMatchArray returns the matching dash pattern for given array and line width. divides array and matches with wide tolerance. returns true if no match and thus new dash pattern was added, else false.

func DashMulWidth 

func DashMulWidth(lwidth float64, dary []float64) []float64

DashMulWidth returns the dash array multiplied by the line width -- what is actually set

func DashString 

func DashString(dary []float64) string

DashString returns string of dash array values

func DrawAlignMatchHoriz 

func DrawAlignMatchHoriz(sp *core.Sprite, trgsz image.Point)

DrawAlignMatchHoriz renders a horizontal alignment line

func DrawAlignMatchVert 

func DrawAlignMatchVert(sp *core.Sprite, trgsz image.Point)

DrawAlignMatchVert renders a vertical alignment line

func DrawRubberBandHoriz 

func DrawRubberBandHoriz(sp *core.Sprite, trgsz image.Point)

DrawRubberBandHoriz renders a horizontal rubber band line

func DrawRubberBandVert 

func DrawRubberBandVert(sp *core.Sprite, trgsz image.Point)

DrawRubberBandVert renders a vertical rubber band line

func DrawSpriteNodeCtrl 

func DrawSpriteNodeCtrl(sp *core.Sprite, subtyp Sprites)

DrawSpriteNodeCtrl renders a NodePoint sprite handle

func DrawSpriteNodePoint 

func DrawSpriteNodePoint(sp *core.Sprite, bbtyp Sprites)

DrawSpriteNodePoint renders a NodePoint sprite handle

func DrawSpriteReshape 

func DrawSpriteReshape(sp *core.Sprite, bbtyp Sprites)

DrawSpriteReshape renders a Reshape sprite handle

func DrawSpriteSelect 

func DrawSpriteSelect(sp *core.Sprite, bbtyp Sprites)

DrawSpriteSelect renders a Select sprite handle -- smaller

func HandleSpriteSize 

func HandleSpriteSize(scale float32) (int, image.Point)

HandleSpriteSize returns the border size and overall size of handle-type sprites, with given scaling factor

func IconToMarkerName 

func IconToMarkerName(icnm any) string

IconToMarkerName converts a icons.Icon (as an interface{}) to a marker name suitable for use (removes marker- prefix)

func InactivateSprites 

func InactivateSprites(ctx core.Widget, typ Sprites)

InactivateSprites inactivates sprites of given type

func LayerIsLocked 

func LayerIsLocked(kn tree.Node) bool

LayerIsLocked returns true if layer is locked (insensitive = true)

func LayerIsVisible 

func LayerIsVisible(kn tree.Node) bool

LayerIsVisible returns true if layer is visible

func LineSpriteSize 

func LineSpriteSize() (int, int)

LineSpriteSize returns the border size and overall size of line-type sprites

func MarkerDeleteCtxtColors 

func MarkerDeleteCtxtColors(mk *svg.Marker)

MarkerDeleteCtxtColors deletes context-* color names from standard code

func MarkerIconsInit 

func MarkerIconsInit()

MarkerIconsInit ensures that the markers have been turned into icons for selectors, with marker- preix. Call this after startup, when configuring a gui element that needs it. It also initializes the AllMarkersSVGMap.

func MarkerNameToIcon 

func MarkerNameToIcon(nm string) icons.Icon

MarkerNameToIcon converts a marker name to a icons.Icon

func MarkerSetColors 

func MarkerSetColors(mk *svg.Marker, fill, stroke string)

MarkerSetColors sets color properties in each element

func MarkerSetProp 

func MarkerSetProp(sg *svg.SVG, sii svg.Node, prop, name string, mc MarkerColors)

MarkerSetProp sets marker property for given node to given marker name (canonical)

func MarkerUpdateColorProp 

func MarkerUpdateColorProp(sg *svg.SVG, sii svg.Node, prop string)

MarkerUpdateColorProp updates marker color for given marker property

func NewMarker 

func NewMarker(sg *svg.SVG, name string, id int) *svg.Marker

NewMarker makes a new marker of given name and id in given svg, copying from existing one in AllMarkersSVGMap.

func NewMarkerFromXML 

func NewMarkerFromXML(name, xml string) *svg.Marker

NewMarkerFromXML makes a new marker from given XML source.

func NewSVGElement 

func NewSVGElement[T tree.NodeValue](sv *SVG) *T

NewSVGElement makes a new SVG element of the given type. It uses the current active layer if it is set.

func NewSVGElementDrag 

func NewSVGElementDrag[T tree.NodeValue](sv *SVG, start, end image.Point) *T

NewSVGElementDrag makes a new SVG element of the given type during the drag operation.

func NodeIsLayer 

func NodeIsLayer(kn tree.Node) bool

NodeIsLayer returns true if given node is a layer

func NodeIsMetaData 

func NodeIsMetaData(kn tree.Node) bool

NodeIsMetaData returns true if given node is a MetaData

func NodeParentLayer 

func NodeParentLayer(n tree.Node) tree.Node

NodeParentLayer returns the parent group that is a layer -- nil if none

func ProportionalBBox 

func ProportionalBBox(bb, orig math32.Box2) math32.Box2

func RecycleMarker 

func RecycleMarker(sg *svg.SVG, sii svg.Node, name string, id int, mc MarkerColors) *svg.Marker

RecycleMarker ensures that given marker name and id exists in SVG, making a new one, copying from standard markers if not. if mc is MarkerCopyColor then sets marker colors to node colors.

func SetSpritePos 

func SetSpritePos(sp *core.Sprite, pos image.Point)

SetSpritePos sets sprite position, taking into account relative offsets

func SetSpriteProperties 

func SetSpriteProperties(sp *core.Sprite, typ, subtyp Sprites, idx int)

SetSpriteProperties sets sprite properties

func SnapToIncr 

func SnapToIncr(val, off, incr float32) (float32, bool)

SnapToIncr snaps value to given increment, first subtracting given offset. Tolerance is determined by settings, which is in screen pixels. Returns true if snapped.

func SnapToPt 

func SnapToPt(val, snap float32) (float32, bool)

SnapToPt snaps value to given potential snap point, in screen pixel units. Tolerance is determined by settings. Returns true if snapped.

func SplitsView 

func SplitsView(pt *Splits)

SplitsView opens a view of a splits table

func Sprite 

func Sprite(ctx core.Widget, typ, subtyp Sprites, idx int, trgsz image.Point, init func(sp *core.Sprite)) *core.Sprite

Sprite returns the given sprite in the context of the given widget, making it if not yet made. trgsz is the target size (e.g., for rubber band boxes). Init function is called on new sprites.

func SpriteByName 

func SpriteByName(ctx core.Widget, typ, subtyp Sprites, idx int) (*core.Sprite, bool)

SpriteByName returns the given sprite in the context of the given widget, returning nil, false if not yet made.

func SpriteName 

func SpriteName(typ, subtyp Sprites, idx int) string

SpriteName returns the unique name of the sprite based on main type, subtype (e.g., bbox) if relevant, and index if relevant

func SquareBBox 

func SquareBBox(bb math32.Box2) math32.Box2

func ToolDoesBasicSelect 

func ToolDoesBasicSelect(tl Tools) bool

ToolDoesBasicSelect returns true if tool should do select for clicks

Types

type Actions 

type Actions int32 //enums:enum

const (
	NoAction Actions = iota
	Move
	Reshape
	Rotate
	BoxSelect
	SetStrokeColor
	SetFillColor
	NewElement
	NewText
	NewPath
)
const ActionsN Actions = 10

ActionsN is the highest valid value for type Actions, plus one.

func ActionsValues 

func ActionsValues() []Actions

ActionsValues returns all possible values for the type Actions.

func (Actions) Desc 

func (i Actions) Desc() string

Desc returns the description of the Actions value.

func (Actions) Int64 

func (i Actions) Int64() int64

Int64 returns the Actions value as an int64.

func (Actions) MarshalText 

func (i Actions) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Actions) SetInt64 

func (i *Actions) SetInt64(in int64)

SetInt64 sets the Actions value from an int64.

func (*Actions) SetString 

func (i *Actions) SetString(s string) error

SetString sets the Actions value from its string representation, and returns an error if the string is invalid.

func (Actions) String 

func (i Actions) String() string

String returns the string representation of this Actions value.

func (*Actions) UnmarshalText 

func (i *Actions) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Actions) Values 

func (i Actions) Values() []enums.Enum

Values returns all possible values for the type Actions.

type AlignAnchors 

type AlignAnchors int32 //enums:enum

AlignAnchors are ways of anchoring alignment 

const (
	AlignFirst AlignAnchors = iota
	AlignLast
	AlignDrawing
	AlignSelectBox
)
const AlignAnchorsN AlignAnchors = 4

AlignAnchorsN is the highest valid value for type AlignAnchors, plus one.

func AlignAnchorsValues 

func AlignAnchorsValues() []AlignAnchors

AlignAnchorsValues returns all possible values for the type AlignAnchors.

func (AlignAnchors) Desc 

func (i AlignAnchors) Desc() string

Desc returns the description of the AlignAnchors value.

func (AlignAnchors) Int64 

func (i AlignAnchors) Int64() int64

Int64 returns the AlignAnchors value as an int64.

func (AlignAnchors) MarshalText 

func (i AlignAnchors) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*AlignAnchors) SetInt64 

func (i *AlignAnchors) SetInt64(in int64)

SetInt64 sets the AlignAnchors value from an int64.

func (*AlignAnchors) SetString 

func (i *AlignAnchors) SetString(s string) error

SetString sets the AlignAnchors value from its string representation, and returns an error if the string is invalid.

func (AlignAnchors) String 

func (i AlignAnchors) String() string

String returns the string representation of this AlignAnchors value.

func (*AlignAnchors) UnmarshalText 

func (i *AlignAnchors) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (AlignAnchors) Values 

func (i AlignAnchors) Values() []enums.Enum

Values returns all possible values for the type AlignAnchors.

type AlignView 

type AlignView struct {
	core.Frame

	// Anchor is the alignment anchor
	Anchor AlignAnchors

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

AlignView provides a range of alignment actions on selected objects.

func NewAlignView 

func NewAlignView(parent ...tree.Node) *AlignView

NewAlignView returns a new AlignView with the given optional parent: AlignView provides a range of alignment actions on selected objects.

func (*AlignView) Init 

func (av *AlignView) Init()

func (*AlignView) SetAnchor 

func (t *AlignView) SetAnchor(v AlignAnchors) *AlignView

SetAnchor sets the [AlignView.Anchor]: Anchor is the alignment anchor

func (*AlignView) SetCanvas 

func (t *AlignView) SetCanvas(v *Canvas) *AlignView

SetCanvas sets the [AlignView.Canvas]: the parent Canvas

type Aligns 

type Aligns int32 //enums:enum -transform kebab

Aligns are ways of aligning items 

const (
	// align right edges to left edge of anchor item
	AlignRightAnchor Aligns = iota

	// align left edges
	AlignLeft

	// align horizontal centers
	AlignCenter

	// align right edges
	AlignRight

	// align left edges to right edge of anchor item
	AlignLeftAnchor

	// align left text baseline edges
	AlignBaselineHoriz

	// align bottom edges to top edge of anchor item
	AlignBottomAnchor

	// align top edges
	AlignTop

	// align middle vertical point
	AlignMiddle

	// align bottom edges
	AlignBottom

	// align top edges to bottom edge of anchor item
	AlignTopAnchor

	// align baseline points vertically
	AlignBaselineVert
)
const AlignsN Aligns = 12

AlignsN is the highest valid value for type Aligns, plus one.

func AlignsValues 

func AlignsValues() []Aligns

AlignsValues returns all possible values for the type Aligns.

func (Aligns) Desc 

func (i Aligns) Desc() string

Desc returns the description of the Aligns value.

func (Aligns) Int64 

func (i Aligns) Int64() int64

Int64 returns the Aligns value as an int64.

func (Aligns) MarshalText 

func (i Aligns) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Aligns) SetInt64 

func (i *Aligns) SetInt64(in int64)

SetInt64 sets the Aligns value from an int64.

func (*Aligns) SetString 

func (i *Aligns) SetString(s string) error

SetString sets the Aligns value from its string representation, and returns an error if the string is invalid.

func (Aligns) String 

func (i Aligns) String() string

String returns the string representation of this Aligns value.

func (*Aligns) UnmarshalText 

func (i *Aligns) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Aligns) Values 

func (i Aligns) Values() []enums.Enum

Values returns all possible values for the type Aligns.

type BBoxPoints 

type BBoxPoints int32 //enums:enum

BBoxPoints are the different control points within a bounding box 

const (
	BBLeft BBoxPoints = iota
	BBCenter
	BBRight
	BBTop
	BBMiddle
	BBBottom
)
const BBoxPointsN BBoxPoints = 6

BBoxPointsN is the highest valid value for type BBoxPoints, plus one.

func BBoxPointsValues 

func BBoxPointsValues() []BBoxPoints

BBoxPointsValues returns all possible values for the type BBoxPoints.

func ReshapeBBoxPoints 

func ReshapeBBoxPoints(reshape Sprites) (bbX, bbY BBoxPoints)

ReshapeBBoxPoints returns the X and Y BBoxPoints for given sprite Reshape control point.

func (BBoxPoints) Desc 

func (i BBoxPoints) Desc() string

Desc returns the description of the BBoxPoints value.

func (BBoxPoints) Dim 

func (ev BBoxPoints) Dim() math32.Dims

Dim returns the relevant dimension for this point

func (BBoxPoints) Int64 

func (i BBoxPoints) Int64() int64

Int64 returns the BBoxPoints value as an int64.

func (BBoxPoints) MarshalText 

func (i BBoxPoints) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (BBoxPoints) MoveDelta 

func (ev BBoxPoints) MoveDelta(bb *math32.Box2, delta float32)

MoveDelta moves overall bbox (Max and Min) by delta (X or Y depending on pt)

func (BBoxPoints) PointBox 

func (ev BBoxPoints) PointBox(bb math32.Box2) math32.Vector2

PointBox returns the relevant point for a given bounding box, where relevant dimension is from ValRect and other is midpoint -- for drawing lines. BBox is an image.Rectangle

func (BBoxPoints) PointRect 

func (ev BBoxPoints) PointRect(bb image.Rectangle) math32.Vector2

PointRect returns the relevant point for a given bounding box, where relevant dimension is from ValRect and other is midpoint -- for drawing lines. BBox is an image.Rectangle

func (*BBoxPoints) SetInt64 

func (i *BBoxPoints) SetInt64(in int64)

SetInt64 sets the BBoxPoints value from an int64.

func (*BBoxPoints) SetString 

func (i *BBoxPoints) SetString(s string) error

SetString sets the BBoxPoints value from its string representation, and returns an error if the string is invalid.

func (BBoxPoints) SetValueBox 

func (ev BBoxPoints) SetValueBox(bb *math32.Box2, val float32)

SetValueBox sets the relevant value for a given bounding box as a math32.Box2

func (BBoxPoints) String 

func (i BBoxPoints) String() string

String returns the string representation of this BBoxPoints value.

func (*BBoxPoints) UnmarshalText 

func (i *BBoxPoints) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (BBoxPoints) ValueBox 

func (ev BBoxPoints) ValueBox(bb math32.Box2) float32

ValueBox returns the relevant value for a given bounding box as a math32.Box2

func (BBoxPoints) ValueRect 

func (ev BBoxPoints) ValueRect(bb image.Rectangle) float32

ValueRect returns the relevant value for a given bounding box as an image.Rectangle

func (BBoxPoints) Values 

func (i BBoxPoints) Values() []enums.Enum

Values returns all possible values for the type BBoxPoints.

type Canvas 

type Canvas struct {
	core.Frame

	// full path to current drawing filename
	Filename core.Filename `extension:".svg" set:"-"`

	// current edit state
	EditState EditState `set:"-"`
}

Canvas is the main widget of the Cogent Canvas SVG vector graphics program.

func NewCanvas 

func NewCanvas(parent ...tree.Node) *Canvas

NewCanvas returns a new Canvas with the given optional parent: Canvas is the main widget of the Cogent Canvas SVG vector graphics program.

func NewDrawing 

func NewDrawing(sz PhysSize) *Canvas

NewDrawing opens a new drawing window

func NewWindow 

func NewWindow(fnm string) *Canvas

NewWindow returns a new Canvas in a new window loading given file if non-empty.

func (*Canvas) AddImage 

func (cv *Canvas) AddImage(fname core.Filename, width, height float32) error

AddImage adds a new image node set to the given image

func (*Canvas) AddLayer 

func (vv *Canvas) AddLayer()

AddLayer adds a new layer

func (*Canvas) Align 

func (vv *Canvas) Align(aa AlignAnchors, al Aligns)

func (*Canvas) AlignAnchorBBox 

func (vv *Canvas) AlignAnchorBBox(aa AlignAnchors) (image.Rectangle, svg.Node)

AlignAnchorBBox returns the bounding box for given type of align anchor and the anchor node if non-nil

func (*Canvas) AlignCenter 

func (vv *Canvas) AlignCenter(aa AlignAnchors, dim math32.Dims, act string)

func (*Canvas) AlignMax 

func (vv *Canvas) AlignMax(aa AlignAnchors, dim math32.Dims, act string)

func (*Canvas) AlignMaxAnchor 

func (vv *Canvas) AlignMaxAnchor(aa AlignAnchors, dim math32.Dims, act string)

func (*Canvas) AlignMin 

func (vv *Canvas) AlignMin(aa AlignAnchors, dim math32.Dims, act string)

AlignMin aligns to min coordinate (Left, Top) in bbox

func (*Canvas) AlignMinAnchor 

func (vv *Canvas) AlignMinAnchor(aa AlignAnchors, dim math32.Dims, act string)

func (*Canvas) AutoSave 

func (vv *Canvas) AutoSave() error

AutoSave does the autosave -- safe to call in a separate goroutine

func (*Canvas) AutoSaveCheck 

func (vv *Canvas) AutoSaveCheck() bool

AutoSaveCheck checks if an autosave file exists -- logic for dealing with it is left to larger app -- call this before opening a file

func (*Canvas) AutoSaveDelete 

func (vv *Canvas) AutoSaveDelete()

AutoSaveDelete deletes any existing autosave file

func (*Canvas) AutoSaveFilename 

func (vv *Canvas) AutoSaveFilename() string

AutoSaveFilename returns the autosave filename

func (*Canvas) ChangeMade 

func (vv *Canvas) ChangeMade()

ChangeMade should be called after any change is completed on the drawing. Calls autosave.

func (*Canvas) ClearCurLayer 

func (vv *Canvas) ClearCurLayer(lay string)

ClearCurLayer clears the current layer for creating items if it was set to the given layer name

func (*Canvas) CopySelected 

func (gv *Canvas) CopySelected()

CopySelected copies selected items in SVG view, using Tree methods

func (*Canvas) CutSelected 

func (gv *Canvas) CutSelected()

CutSelected cuts selected items in SVG view, using Tree methods

func (*Canvas) DefaultGradient 

func (vv *Canvas) DefaultGradient() string

DefaultGradient returns the default gradient to use for setting stops

func (*Canvas) DeleteSelected 

func (gv *Canvas) DeleteSelected()

DeleteSelected deletes selected items in SVG view, using Tree methods

func (*Canvas) DuplicateSelected 

func (gv *Canvas) DuplicateSelected()

DuplicateSelected duplicates selected items in SVG view, using Tree methods

func (*Canvas) EditRecents 

func (vv *Canvas) EditRecents()

RecentsEdit opens a dialog editor for deleting from the recents project list

func (*Canvas) ExportPDF 

func (cv *Canvas) ExportPDF(dpi float32) error

ExportPDF exports drawing to a PDF file (auto-names to same name with .pdf suffix). Calls inkscape -- needs to be on the PATH. specify DPI of resulting image for effects rendering. Renders full current page -- do ResizeToContents to render just current contents.

func (*Canvas) ExportPNG 

func (cv *Canvas) ExportPNG(width, height float32) error

ExportPNG exports drawing to a PNG image (auto-names to same name with .png suffix). Calls inkscape -- needs to be on the PATH. specify either width or height of resulting image, or nothing for physical size as set. Renders full current page -- do ResizeToContents to render just current contents.

func (*Canvas) FirstLayerIndex 

func (vv *Canvas) FirstLayerIndex() int

FirstLayerIndex returns index of first layer group in svg

func (*Canvas) HBox 

func (cv *Canvas) HBox() *core.Frame

func (*Canvas) HelpWiki 

func (vv *Canvas) HelpWiki()

HelpWiki opens wiki page for grid on github

func (*Canvas) Init 

func (cv *Canvas) Init()

func (*Canvas) InitSelectButton 

func (vc *Canvas) InitSelectButton(w core.Widget)

InitSelectButton sets the given widget to only be enabled when there is an item selected.

func (*Canvas) IsCurLayer 

func (vv *Canvas) IsCurLayer(lay string) bool

IsCurLayer returns true if given layer is the current layer for creating items

func (*Canvas) LayerTree 

func (cv *Canvas) LayerTree() *core.Frame

func (*Canvas) LayerView 

func (vv *Canvas) LayerView() *core.Table

func (*Canvas) LayerViewSigs 

func (vv *Canvas) LayerViewSigs(lyv *core.Table)

func (*Canvas) MakeNodeToolbar 

func (vv *Canvas) MakeNodeToolbar(p *tree.Plan)

func (*Canvas) MakeSelectToolbar 

func (vc *Canvas) MakeSelectToolbar(p *tree.Plan)

MakeSelectToolbar adds the select toolbar to the given plan.

func (*Canvas) MakeTextToolbar 

func (vc *Canvas) MakeTextToolbar(p *tree.Plan)

func (*Canvas) MakeToolbar 

func (vv *Canvas) MakeToolbar(p *tree.Plan)

func (*Canvas) MakeTools 

func (vc *Canvas) MakeTools(p *tree.Plan)

func (*Canvas) ManipAction 

func (vv *Canvas) ManipAction(act Actions, data string, manip bool, fun func(sii svg.Node))

ManipAction manages all the updating etc associated with performing an action that includes an ongoing manipulation with a final non-manip update. runs given function to actually do the update.

func (*Canvas) ManipActionFun 

func (vv *Canvas) ManipActionFun(sii svg.Node, fun func(itm svg.Node))

func (*Canvas) ModalToolbar 

func (cv *Canvas) ModalToolbar() *core.Toolbar

func (*Canvas) NewDrawing 

func (cv *Canvas) NewDrawing(sz PhysSize) *Canvas

NewDrawing creates a new drawing of the given size

func (*Canvas) NodeEnableFunc 

func (vv *Canvas) NodeEnableFunc(act *core.Button)

NodeEnableFunc is an ActionUpdateFunc that inactivates action if no node selected

func (*Canvas) NodeSetXPos 

func (vv *Canvas) NodeSetXPos(xp float32)

func (*Canvas) NodeSetYPos 

func (vv *Canvas) NodeSetYPos(yp float32)

func (*Canvas) OpenDrawing 

func (cv *Canvas) OpenDrawing(fnm core.Filename) error

OpenDrawing opens a new .svg drawing

func (*Canvas) OpenDrawingFile 

func (cv *Canvas) OpenDrawingFile(fnm core.Filename) error

OpenDrawingFile opens a new .svg drawing file -- just the basic opening

func (*Canvas) OpenRecent 

func (vv *Canvas) OpenRecent(filename core.Filename)

OpenRecent opens a recently used file

func (*Canvas) PaintView 

func (vv *Canvas) PaintView() *PaintView

func (*Canvas) PasteAvailFunc 

func (vv *Canvas) PasteAvailFunc(bt *core.Button)

PasteAvailFunc is an ActionUpdateFunc that inactivates action if no paste avail

func (*Canvas) PasteClip 

func (gv *Canvas) PasteClip()

PasteClip pastes clipboard, using cur layer etc

func (*Canvas) PromptPhysSize 

func (cv *Canvas) PromptPhysSize()

PromptPhysSize prompts for the physical size of the drawing and sets it

func (*Canvas) Redo 

func (vv *Canvas) Redo() string

Redo redoes the previously undone action

func (*Canvas) ResizeToContents 

func (cv *Canvas) ResizeToContents()

ResizeToContents resizes the drawing to just fit the current contents, including moving everything to start at upper-left corner, preserving the current grid offset, so grid snapping is preserved.

func (*Canvas) SSVG 

func (vv *Canvas) SSVG() *svg.SVG

SSVG returns the underlying svg.SVG.

func (*Canvas) SVG 

func (vv *Canvas) SVG() *SVG

SVG returns the SVG.

func (*Canvas) SaveDrawing 

func (cv *Canvas) SaveDrawing() error

SaveDrawing saves .svg drawing to current filename

func (*Canvas) SaveDrawingAs 

func (cv *Canvas) SaveDrawingAs(fname core.Filename) error

SaveDrawingAs saves .svg drawing to given filename

func (*Canvas) SelectFlipHorizontal 

func (gv *Canvas) SelectFlipHorizontal()

SelectFlipHorizontal flips the selection horizontally

func (*Canvas) SelectFlipVertical 

func (gv *Canvas) SelectFlipVertical()

SelectFlipVertical flips the selection vertically

func (*Canvas) SelectGroup 

func (gv *Canvas) SelectGroup()

SelectGroup groups items together

func (*Canvas) SelectLower 

func (gv *Canvas) SelectLower()

SelectLower lowers the selection by one level in the layer

func (*Canvas) SelectLowerBottom 

func (gv *Canvas) SelectLowerBottom()

SelectLowerBottom lowers the selection to the bottom of the layer

func (*Canvas) SelectNodeInSVG 

func (vv *Canvas) SelectNodeInSVG(kn tree.Node, mode events.SelectModes)

SelectNodeInSVG selects given svg node in SVG drawing

func (*Canvas) SelectNodeInTree 

func (gv *Canvas) SelectNodeInTree(kn tree.Node, mode events.SelectModes)

SelectNodeInTree selects given node in Tree

func (*Canvas) SelectRaise 

func (gv *Canvas) SelectRaise()

SelectRaise raises the selection by one level in the layer

func (*Canvas) SelectRaiseTop 

func (gv *Canvas) SelectRaiseTop()

SelectRaiseTop raises the selection to the top of the layer

func (*Canvas) SelectRotate 

func (gv *Canvas) SelectRotate(deg float32)

func (*Canvas) SelectRotateLeft 

func (gv *Canvas) SelectRotateLeft()

SelectRotateLeft rotates the selection 90 degrees counter-clockwise

func (*Canvas) SelectRotateRight 

func (gv *Canvas) SelectRotateRight()

SelectRotateRight rotates the selection 90 degrees clockwise

func (*Canvas) SelectScale 

func (gv *Canvas) SelectScale(scx, scy float32)

func (*Canvas) SelectSetHeight 

func (gv *Canvas) SelectSetHeight(ht float32)

func (*Canvas) SelectSetWidth 

func (gv *Canvas) SelectSetWidth(wd float32)

func (*Canvas) SelectSetXPos 

func (gv *Canvas) SelectSetXPos(xp float32)

func (*Canvas) SelectSetYPos 

func (gv *Canvas) SelectSetYPos(yp float32)

func (*Canvas) SelectUnGroup 

func (gv *Canvas) SelectUnGroup()

SelectUnGroup ungroups items from each other

func (*Canvas) SelectedAsTrees 

func (gv *Canvas) SelectedAsTrees() []core.Treer

SelectedAsTrees returns the currently selected items from SVG as Tree nodes

func (*Canvas) SetColorNode 

func (vv *Canvas) SetColorNode(sii svg.Node, prop string, prev, pt PaintTypes, sp string)

SetColorNode sets the color properties of Node based on previous and current PaintType

func (*Canvas) SetCurLayer 

func (vv *Canvas) SetCurLayer(lay string)

SetCurLayer sets the current layer for creating items to given one

func (*Canvas) SetDashNode 

func (vv *Canvas) SetDashNode(sii svg.Node, dary []float64)

SetDashNode sets the stroke-dasharray property of Node. multiplies dash values by the line width in dots.

func (*Canvas) SetDashProperties 

func (vv *Canvas) SetDashProperties(dary []float64)

SetDashProperties sets the dash properties

func (*Canvas) SetDefaultStyle 

func (vv *Canvas) SetDefaultStyle()

func (*Canvas) SetFill 

func (vv *Canvas) SetFill(prev, pt PaintTypes, fp string)

SetFill sets the fill properties of selected items based on previous and current PaintType

func (*Canvas) SetFillColor 

func (vv *Canvas) SetFillColor(fp string, manip bool)

SetFillColor sets the fill color for selected items manip means currently being manipulated -- don't save undo.

func (*Canvas) SetMarkerNode 

func (vv *Canvas) SetMarkerNode(sii svg.Node, start, mid, end string, sc, mc, ec MarkerColors)

SetMarkerNode sets the marker properties of Node.

func (*Canvas) SetMarkerProperties 

func (vv *Canvas) SetMarkerProperties(start, mid, end string, sc, mc, ec MarkerColors)

SetMarkerProperties sets the marker properties

func (*Canvas) SetPhysSize 

func (cv *Canvas) SetPhysSize(sz *PhysSize)

SetPhysSize sets physical size of drawing

func (*Canvas) SetStatus 

func (cv *Canvas) SetStatus(msg string)

SetStatus updates the status bar text with the given message, along with other status info

func (*Canvas) SetStroke 

func (vv *Canvas) SetStroke(prev, pt PaintTypes, sp string)

SetStroke sets the stroke properties of selected items based on previous and current PaintType

func (*Canvas) SetStrokeColor 

func (vv *Canvas) SetStrokeColor(sp string, manip bool)

SetStrokeColor sets the stroke color for selected items. manip means currently being manipulated -- don't save undo.

func (*Canvas) SetStrokeWidth 

func (vv *Canvas) SetStrokeWidth(wp string, manip bool)

SetStrokeWidth sets the stroke width property for selected items manip means currently being manipulated -- don't save undo.

func (*Canvas) SetStrokeWidthNode 

func (vv *Canvas) SetStrokeWidthNode(sii svg.Node, wp string)

SetStrokeWidthNode sets the stroke width of Node

func (*Canvas) SetText 

func (gv *Canvas) SetText(txt string)

SetText sets the text of selected Text node

func (*Canvas) SetTextNode 

func (gv *Canvas) SetTextNode(sii svg.Node, txt string) bool

SetTextNode sets the text of given Text node

func (*Canvas) SetTextProperties 

func (gv *Canvas) SetTextProperties(tps map[string]string)

SetTextProperties sets the text properties of selected Text nodes

func (*Canvas) SetTextPropertiesNode 

func (gv *Canvas) SetTextPropertiesNode(sii svg.Node, tps map[string]string)

SetTextPropertiesNode sets the text properties of given Text node

func (*Canvas) SetTitle 

func (vv *Canvas) SetTitle()

func (*Canvas) SetTool 

func (vc *Canvas) SetTool(tl Tools)

SetTool sets the current active tool

func (*Canvas) Splits 

func (cv *Canvas) Splits() *core.Splits

func (*Canvas) SplitsEdit 

func (vv *Canvas) SplitsEdit()

SplitsEdit opens the SplitsView editor to customize saved splitter settings

func (*Canvas) SplitsSave 

func (vv *Canvas) SplitsSave(split SplitName)

SplitsSave saves current splitter settings to named splitter settings under existing name, and saves to prefs file

func (*Canvas) SplitsSaveAs 

func (vv *Canvas) SplitsSaveAs(name, desc string)

SplitsSaveAs saves current splitter settings to new named splitter settings, and saves to prefs file

func (*Canvas) SplitsSetView 

func (vv *Canvas) SplitsSetView(split SplitName)

SplitsSetView sets split view splitters to given named setting

func (*Canvas) StatusBar 

func (vv *Canvas) StatusBar() *core.Frame

StatusBar returns the status bar widget

func (*Canvas) StatusText 

func (vv *Canvas) StatusText() *core.Text

StatusText returns the status bar text widget

func (*Canvas) SyncLayers 

func (vv *Canvas) SyncLayers()

func (*Canvas) Tab 

func (gv *Canvas) Tab(name string) *core.Frame

Tab returns the tab with the given name

func (*Canvas) Tabs 

func (vv *Canvas) Tabs() *core.Tabs

func (*Canvas) Tools 

func (cv *Canvas) Tools() *core.Toolbar

func (*Canvas) Tree 

func (vv *Canvas) Tree() *Tree

func (*Canvas) Undo 

func (vv *Canvas) Undo() string

Undo undoes the last action

func (*Canvas) UpdateAll 

func (vv *Canvas) UpdateAll()

UpdateAll updates the display

func (*Canvas) UpdateDisp 

func (vv *Canvas) UpdateDisp()

func (*Canvas) UpdateGradients 

func (vv *Canvas) UpdateGradients()

UpdateGradients updates gradients from EditState

func (*Canvas) UpdateLayerView 

func (vv *Canvas) UpdateLayerView()

func (*Canvas) UpdateMarkerColors 

func (vv *Canvas) UpdateMarkerColors(sii svg.Node)

UpdateMarkerColors updates the marker colors, when setting fill or stroke

func (*Canvas) UpdateNodeToolbar 

func (vv *Canvas) UpdateNodeToolbar()

UpdateNodeToolbar updates the node toolbar based on current nodeion

func (*Canvas) UpdateSelectToolbar 

func (vc *Canvas) UpdateSelectToolbar()

UpdateSelectToolbar updates the select toolbar based on current selection

func (*Canvas) UpdateTabs 

func (vv *Canvas) UpdateTabs()

func (*Canvas) UpdateTextToolbar 

func (gv *Canvas) UpdateTextToolbar()

UpdateTextToolbar updates the select toolbar based on current selection

func (*Canvas) UpdateTree 

func (vv *Canvas) UpdateTree()

type EditState 

type EditState struct {

	// current tool in use
	Tool Tools

	// current action being performed, for undo labeling
	Action Actions

	// action data set at start of action
	ActData string

	// list of layers
	Layers Layers

	// current layer -- where new objects are inserted
	CurLayer string

	// current shared gradients, referenced by obj-specific gradients
	Gradients []*Gradient

	// current text styling info
	Text TextStyle

	// the undo manager
	Undos undo.Stack

	// contents have changed
	Changed bool `display:"inactive"`

	// action mutex, protecting start / end of actions
	ActMu sync.Mutex `copier:"-" json:"-" xml:"-" display:"-"`

	// selected item(s)
	Selected map[svg.Node]*SelectedState `copier:"-" json:"-" xml:"-" display:"-"`

	// selection just happened on press, and no drag happened in between
	SelectNoDrag bool

	// true if a new text item was made while dragging
	NewTextMade bool

	// point where dragging started, mouse coords
	DragStartPos image.Point

	// current dragging position, mouse coords
	DragCurPos image.Point

	// current selection bounding box
	SelectBBox math32.Box2

	// number of current selectbox sprites
	NSelectSprites int

	// last select action position -- continued clicks in same area lead to deeper selection
	LastSelectPos image.Point

	// recently selected item(s) -- within the same selection position
	RecentlySelected map[svg.Node]*SelectedState `copier:"-" json:"-" xml:"-" display:"-"`

	// bbox at start of dragging
	DragSelectStartBBox math32.Box2

	// current bbox during dragging -- non-snapped version
	DragSelectCurrentBBox math32.Box2

	// current effective bbox during dragging -- snapped version
	DragSelectEffectiveBBox math32.Box2

	// potential points of alignment for dragging
	AlignPts [BBoxPointsN][]math32.Vector2

	// number of current node sprites in use
	NNodeSprites int

	// currently manipulating path object
	ActivePath *svg.Path

	// current path node points
	PathNodes []*PathNode

	// selected path nodes
	PathSelect map[int]struct{}

	// current path command indexes within PathNodes -- where the commands start
	PathCommands []int

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

EditState has all the current edit state information

func (*EditState) ActDone 

func (es *EditState) ActDone()

ActDone finishes an action, resetting action

func (*EditState) ActStart 

func (es *EditState) ActStart(act Actions, data string)

ActStart starts an action, locking the mutex so only one can start

func (*EditState) ActUnlock 

func (es *EditState) ActUnlock()

ActUnlock unlocks the action mutex -- after done doing all action starting steps

func (*EditState) ConfigDefaultGradient 

func (es *EditState) ConfigDefaultGradient()

ConfigDefaultGradient configures a new default gradient

func (*EditState) DragNodeStart 

func (es *EditState) DragNodeStart(pos image.Point)

DragNodeStart captures the current state at start of node dragging. position is starting position.

func (*EditState) DragReset 

func (es *EditState) DragReset()

DragReset resets drag state information

func (*EditState) DragSelStart 

func (es *EditState) DragSelStart(pos image.Point)

DragSelStart captures the current state at start of dragging manipulation with selected items. position is starting position.

func (*EditState) FirstSelectedNode 

func (es *EditState) FirstSelectedNode() svg.Node

FirstSelectedNode returns the first selected node, that is not a Group (recurses into groups)

func (*EditState) FirstSelectedPath 

func (es *EditState) FirstSelectedPath() *svg.Path

FirstSelectedPath returns the first selected Path, that is not a Group (recurses into groups)

func (*EditState) HasSelected 

func (es *EditState) HasSelected() bool

HasSelected returns true if there are selected items

func (*EditState) InAction 

func (es *EditState) InAction() bool

InAction reports whether we currently doing an action

func (*EditState) Init 

func (es *EditState) Init(vv *Canvas)

Init initializes the edit state -- e.g. after opening a new file

func (*EditState) IsSelected 

func (es *EditState) IsSelected(itm svg.Node) bool

IsSelected returns the selected status of given slice index

func (*EditState) NewRecents 

func (es *EditState) NewRecents()

func (*EditState) NewSelected 

func (es *EditState) NewSelected()

NewSelected makes a new Selected list

func (*EditState) PosInLastSelect 

func (es *EditState) PosInLastSelect(pos image.Point) bool

PosInLastSelect returns true if position is within tolerance of last selection point

func (*EditState) ResetSelected 

func (es *EditState) ResetSelected()

ResetSelected resets the selection list, including recents

func (*EditState) SanitizeSelected 

func (es *EditState) SanitizeSelected()

SanitizeSelected ensures that the current selected list makes sense. E.g., it prevents having a group and a child both in the selected list (removes the parent group).

func (*EditState) Select 

func (es *EditState) Select(itm svg.Node)

Select selects given item (if not already selected) -- updates select status of index text

func (*EditState) SelectAction 

func (es *EditState) SelectAction(n svg.Node, mode events.SelectModes, pos image.Point)

SelectAction is called when a select action has been received (e.g., a mouse click) -- translates into selection updates -- gets selection mode from mouse event (ExtendContinuous, ExtendOne)

func (*EditState) SelectedList 

func (es *EditState) SelectedList(descendingSort bool) []svg.Node

SelectedList returns list of selected items, sorted either ascending or descending according to order of selection

func (*EditState) SelectedListDepth 

func (es *EditState) SelectedListDepth(sv *SVG, descendingSort bool) []svg.Node

SelectedListDepth returns list of selected items, sorted either ascending or descending according to depth: ascending = deepest first, descending = highest first

func (*EditState) SelectedNames 

func (es *EditState) SelectedNames() []string

SelectedNames returns names of selected items, in order selected

func (*EditState) SelectedNamesString 

func (es *EditState) SelectedNamesString() string

SelectedNamesString returns names of selected items as a space-separated single string. If over 256 chars long, then truncated.

func (*EditState) SelectedToRecents 

func (es *EditState) SelectedToRecents()

func (*EditState) StartRecents 

func (es *EditState) StartRecents(pos image.Point)

StartRecents starts a new list of recently selected items

func (*EditState) Unselect 

func (es *EditState) Unselect(itm svg.Node)

Unselect unselects given idx (if selected)

func (*EditState) UpdateSelectBBox 

func (es *EditState) UpdateSelectBBox()

UpdateSelectBBox updates the current selection bbox surrounding all selected items

type GradStop 

type GradStop struct {

	// color -- alpha is ignored -- set opacity separately
	Color color.Color

	// opacity determines how opaque color is - used instead of alpha in color
	Opacity float64

	// offset position along the gradient vector: 0 = start, 1 = nominal end
	Offset float64
}

GradStop represents a single gradient stop

type Gradient 

type Gradient struct {

	// icon of gradient -- generated to display each gradient
	Ic core.SVG `edit:"-" table:"no-header" width:"5"`

	// name of gradient (id)
	Id string `edit:"-" width:"6"`

	// full name of gradient as SVG element
	Name string `display:"-"`

	// gradient stops
	Stops []*GradStop
}

Gradient represents a single gradient that defines stops (referenced in StopName of other gradients)

func (*Gradient) UpdateIcon 

func (gr *Gradient) UpdateIcon()

UpdateIcon updates icon

type Layer 

type Layer struct {
	Name string

	// visiblity toggle
	Vis bool

	// lock toggle
	Lck bool
}

Layer represents one layer group

func (*Layer) FromNode 

func (l *Layer) FromNode(k tree.Node)

FromNode copies state / prop values from given node

func (*Layer) ToNode 

func (l *Layer) ToNode(n tree.Node)

ToNode copies state / prop values to given node

type Layers 

type Layers []*Layer

Layers is the list of all layers

func (*Layers) LayerIndexByName 

func (ly *Layers) LayerIndexByName(nm string) int

func (*Layers) LayersUpdated 

func (ly *Layers) LayersUpdated(sv *SVG)

func (*Layers) SyncLayers 

func (ly *Layers) SyncLayers(sv *SVG)

type MarkerColors 

type MarkerColors int32 //enums:enum -trim-prefix Marker

MarkerColors are the drawing tools 

const (
	// use the default color of marker (typically black)
	MarkerDef MarkerColors = iota

	// copy color of object using marker (create separate marker object per element)
	MarkerCopy

	// marker has its own separate custom color
	MarkerCust
)
const MarkerColorsN MarkerColors = 3

MarkerColorsN is the highest valid value for type MarkerColors, plus one.

func MarkerColorsValues 

func MarkerColorsValues() []MarkerColors

MarkerColorsValues returns all possible values for the type MarkerColors.

func MarkerFromNodeProp 

func MarkerFromNodeProp(n tree.Node, prop string) (string, int, MarkerColors)

MarkerFromNodeProp returns the marker name (canonicalized -- no id) and id and color type

func (MarkerColors) Desc 

func (i MarkerColors) Desc() string

Desc returns the description of the MarkerColors value.

func (MarkerColors) Int64 

func (i MarkerColors) Int64() int64

Int64 returns the MarkerColors value as an int64.

func (MarkerColors) MarshalText 

func (i MarkerColors) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*MarkerColors) SetInt64 

func (i *MarkerColors) SetInt64(in int64)

SetInt64 sets the MarkerColors value from an int64.

func (*MarkerColors) SetString 

func (i *MarkerColors) SetString(s string) error

SetString sets the MarkerColors value from its string representation, and returns an error if the string is invalid.

func (MarkerColors) String 

func (i MarkerColors) String() string

String returns the string representation of this MarkerColors value.

func (*MarkerColors) UnmarshalText 

func (i *MarkerColors) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (MarkerColors) Values 

func (i MarkerColors) Values() []enums.Enum

Values returns all possible values for the type MarkerColors.

type PaintTypes 

type PaintTypes int32 //enums:enum -trim-prefix Paint

const (
	PaintOff PaintTypes = iota
	PaintSolid
	PaintLinear
	PaintRadial
	PaintInherit
)
const PaintTypesN PaintTypes = 5

PaintTypesN is the highest valid value for type PaintTypes, plus one.

func PaintTypesValues 

func PaintTypesValues() []PaintTypes

PaintTypesValues returns all possible values for the type PaintTypes.

func (PaintTypes) Desc 

func (i PaintTypes) Desc() string

Desc returns the description of the PaintTypes value.

func (PaintTypes) Int64 

func (i PaintTypes) Int64() int64

Int64 returns the PaintTypes value as an int64.

func (PaintTypes) MarshalText 

func (i PaintTypes) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*PaintTypes) SetInt64 

func (i *PaintTypes) SetInt64(in int64)

SetInt64 sets the PaintTypes value from an int64.

func (*PaintTypes) SetString 

func (i *PaintTypes) SetString(s string) error

SetString sets the PaintTypes value from its string representation, and returns an error if the string is invalid.

func (PaintTypes) String 

func (i PaintTypes) String() string

String returns the string representation of this PaintTypes value.

func (*PaintTypes) UnmarshalText 

func (i *PaintTypes) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (PaintTypes) Values 

func (i PaintTypes) Values() []enums.Enum

Values returns all possible values for the type PaintTypes.

type PaintView 

type PaintView struct {
	core.Frame

	// Active styles
	PaintStyle styles.Paint

	// paint type for stroke
	StrokeType PaintTypes

	// name of gradient with stops
	StrokeStops string

	// paint type for fill
	FillType PaintTypes

	// name of gradient with stops
	FillStops string

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
	// contains filtered or unexported fields
}

PaintView provides editing of basic Stroke and Fill painting parameters for selected items

func NewPaintView 

func NewPaintView(parent ...tree.Node) *PaintView

NewPaintView returns a new PaintView with the given optional parent: PaintView provides editing of basic Stroke and Fill painting parameters for selected items

func (*PaintView) FillProp 

func (pv *PaintView) FillProp() string

FillProp returns the fill property string according to current settings

func (*PaintView) Init 

func (pv *PaintView) Init()

func (*PaintView) IsFillOn 

func (pv *PaintView) IsFillOn() bool

IsFillOn returns true if Fill is active

func (*PaintView) IsStrokeOn 

func (pv *PaintView) IsStrokeOn() bool

IsStrokeOn returns true if stroke is active

func (*PaintView) MarkerProperties 

func (pv *PaintView) MarkerProperties() (start, mid, end string, sc, mc, ec MarkerColors)

MarkerProp returns the marker property string according to current settings along with color type to set.

func (*PaintView) SelectFillGrad 

func (pv *PaintView) SelectFillGrad()

func (*PaintView) SelectStrokeGrad 

func (pv *PaintView) SelectStrokeGrad()

func (*PaintView) SetCanvas 

func (t *PaintView) SetCanvas(v *Canvas) *PaintView

SetCanvas sets the [PaintView.Canvas]: the parent Canvas

func (*PaintView) SetFillStops 

func (t *PaintView) SetFillStops(v string) *PaintView

SetFillStops sets the [PaintView.FillStops]: name of gradient with stops

func (*PaintView) SetFillType 

func (t *PaintView) SetFillType(v PaintTypes) *PaintView

SetFillType sets the [PaintView.FillType]: paint type for fill

func (*PaintView) SetPaintStyle 

func (t *PaintView) SetPaintStyle(v styles.Paint) *PaintView

SetPaintStyle sets the [PaintView.PaintStyle]: Active styles

func (*PaintView) SetProperties 

func (pv *PaintView) SetProperties(sii svg.Node)

SetProperties sets the properties for given node according to current settings

func (*PaintView) SetStrokeStops 

func (t *PaintView) SetStrokeStops(v string) *PaintView

SetStrokeStops sets the [PaintView.StrokeStops]: name of gradient with stops

func (*PaintView) SetStrokeType 

func (t *PaintView) SetStrokeType(v PaintTypes) *PaintView

SetStrokeType sets the [PaintView.StrokeType]: paint type for stroke

func (*PaintView) StrokeDashProp 

func (pv *PaintView) StrokeDashProp() []float64

StrokeDashProp returns stroke-dasharray property as an array (nil = none) these values need to be multiplied by line widths for each item.

func (*PaintView) StrokeProp 

func (pv *PaintView) StrokeProp() string

StrokeProp returns the stroke property string according to current settings

func (*PaintView) StrokeWidthProp 

func (pv *PaintView) StrokeWidthProp() string

StrokeWidthProp returns stroke-width property

type PathNode 

type PathNode struct {

	// path command
	Cmd svg.PathCmds

	// previous path command
	PrevCmd svg.PathCmds

	// starting index of command
	CmdIndex int

	// index of points in data stream
	Index int

	// logical index of point within current command (0 = first point, etc)
	PtIndex int

	// local coords abs previous current point that is starting point for this command
	PCp math32.Vector2

	// local coords abs current point
	Cp math32.Vector2

	// main point coords in window (dot) coords
	WinPt math32.Vector2

	// control point coords in window (dot) coords (nil until manipulated)
	WinCtrls []math32.Vector2
}

PathNode is info about each node in a path that is being edited

type PhysSize 

type PhysSize struct {

	// select a standard size -- this will set units and size
	StandardSize StandardSizes

	// for standard size, use first number as width, second as height
	Portrait bool

	// default units to use, e.g., in line widths etc
	Units units.Units

	// drawing size, in Units
	Size math32.Vector2

	// grid spacing, in units of ViewBox size
	Grid float32
}

PhysSize specifies the physical size of the drawing, when making a new one

func (*PhysSize) Defaults 

func (ps *PhysSize) Defaults()

func (*PhysSize) SetFromSVG 

func (ps *PhysSize) SetFromSVG(sv *SVG)

SetFromSVG sets from svg

func (*PhysSize) SetStandardSize 

func (ps *PhysSize) SetStandardSize(std StandardSizes) error

SetStandardSize sets drawing to a standard size

func (*PhysSize) SetToSVG 

func (ps *PhysSize) SetToSVG(sv *SVG)

SetToSVG sets svg from us

func (*PhysSize) SetToStandardSize 

func (ps *PhysSize) SetToStandardSize() error

SetToStandardSize sets drawing to the current standard size value

func (*PhysSize) Update 

func (ps *PhysSize) Update()

type SVG 

type SVG struct {
	core.WidgetBase

	// SVG is the SVG drawing to display in this widget
	SVG *svg.SVG `set:"-"`

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-" set:"-"`

	// grid spacing, in native ViewBox units
	Grid float32 ` set:"-"`

	// effective grid spacing given Scale level
	GridEff float32 `edit:"-" set:"-"`
	// contains filtered or unexported fields
}

SVG is the element for viewing and interacting with the SVG.

func NewSVG 

func NewSVG(parent ...tree.Node) *SVG

NewSVG returns a new SVG with the given optional parent: SVG is the element for viewing and interacting with the SVG.

func (*SVG) BackgroundNeedsUpdate 

func (sv *SVG) BackgroundNeedsUpdate() bool

func (*SVG) ConstrainPoint 

func (sv *SVG) ConstrainPoint(st, rawpt math32.Vector2) (math32.Vector2, bool)

ConstrainPoint constrains movement of point relative to starting point to either X, Y or diagonal. returns constrained point, and whether the constraint is along the diagonal, which can then trigger reshaping the object to be along the diagonal as well. also adds constraint to AlignMatches.

func (*SVG) ContentsBBox 

func (sv *SVG) ContentsBBox() math32.Box2

ContentsBBox returns the object-level box of the entire contents

func (*SVG) DepthMap 

func (sv *SVG) DepthMap() map[tree.Node]int

DepthMap returns a map of all nodes and their associated depth count counting up from 0 as the deepest, first drawn node.

func (*SVG) DragMove 

func (sv *SVG) DragMove(e events.Event)

DragMove is when dragging a selection for moving

func (*SVG) EditNode 

func (sv *SVG) EditNode(n tree.Node)

EditNode opens a core.Form dialog on the given node.

func (*SVG) EditState 

func (sv *SVG) EditState() *EditState

EditState returns the EditState for this view

func (*SVG) GatherAlignPoints 

func (sv *SVG) GatherAlignPoints()

GatherAlignPoints gets all the potential points of alignment for objects not in selection group

func (*SVG) Gradients 

func (sv *SVG) Gradients() []*Gradient

Gradients returns the currently defined gradients with stops that are shared among obj-specific ones

func (*SVG) GridDots 

func (sv *SVG) GridDots() (float32, math32.Vector2)

GridDots returns the current grid spacing and offsets in dots.

func (*SVG) Init 

func (sv *SVG) Init()

func (*SVG) MakeNodeContextMenu 

func (sv *SVG) MakeNodeContextMenu(m *core.Scene, kn tree.Node)

MakeNodeContextMenu makes the menu of options for context right click

func (*SVG) ManipDone 

func (sv *SVG) ManipDone()

ManipDone happens when a manipulation has finished: resets action, does render

func (*SVG) ManipStart 

func (sv *SVG) ManipStart(act Actions, data string)

ManipStart is called at the start of a manipulation, saving the state prior to the action

func (*SVG) MetaData 

func (sv *SVG) MetaData(mknew bool) (main, grid *svg.MetaData)

MetaData returns the overall metadata and grid if present. if mknew is true, it will create new ones if not found.

func (*SVG) NewPath 

func (sv *SVG) NewPath(start, end image.Point) *svg.Path

NewPath makes a new SVG Path element during the drag operation

func (*SVG) NewText 

func (sv *SVG) NewText(start, end image.Point) svg.Node

NewText makes a new Text element with embedded tspan

func (*SVG) NodeContextMenuPos 

func (sv *SVG) NodeContextMenuPos(pos image.Point) image.Point

ContextMenuPos returns position to use for context menu, based on input position

func (*SVG) PathNodeSetOnePoint 

func (sv *SVG) PathNodeSetOnePoint(path *svg.Path, pts []*PathNode, pidx int, dv math32.Vector2, svoff math32.Vector2)

PathNodeMoveOnePoint moves given node index by given delta in window coords and all following points up to cmd = z or m are moved in the opposite direction to compensate, so only the one point is moved in effect. svoff is the window starting vector coordinate for view.

func (*SVG) PathNodeSetPoint 

func (sv *SVG) PathNodeSetPoint(path *svg.Path, pn *PathNode, npt math32.Vector2)

PathNodeSetPoint sets data point for path node to given new point value which is in *absolute* (but local) coordinates -- translates into relative coordinates as needed.

func (*SVG) PathNodes 

func (sv *SVG) PathNodes(path *svg.Path) ([]*PathNode, []int)

PathNodes returns the PathNode data for given path data, and a list of indexes where commands start

func (*SVG) ReadMetaData 

func (sv *SVG) ReadMetaData()

ReadMetaData reads meta data of drawing

func (*SVG) Redo 

func (sv *SVG) Redo() string

Redo redoes one step, returning the action that was redone

func (*SVG) RemoveNodeSprites 

func (sv *SVG) RemoveNodeSprites()

func (*SVG) RemoveSelSprites 

func (sv *SVG) RemoveSelSprites()

func (*SVG) Render 

func (sv *SVG) Render()

func (*SVG) RenderBackground 

func (sv *SVG) RenderBackground()

RenderBackground renders our background grid image

func (*SVG) RenderSVG 

func (sv *SVG) RenderSVG()

RenderSVG renders the SVG, typically called in a goroutine

func (*SVG) ResizeBg 

func (sv *SVG) ResizeBg(sz image.Point)

func (*SVG) ResizeToContents 

func (sv *SVG) ResizeToContents(grid_off bool)

ResizeToContents resizes the drawing to just fit the current contents, including moving everything to start at upper-left corner, optionally preserving the current grid offset, so grid snapping is preserved -- recommended.

func (*SVG) Root 

func (sv *SVG) Root() *svg.Root

Root returns the root svg.Root.

func (*SVG) SelectContainsPoint 

func (sv *SVG) SelectContainsPoint(pt image.Point, leavesOnly, excludeSel bool) svg.Node

SelectContainsPoint finds the first node whose BBox contains the given point in scene coordinates; nil if none. If leavesOnly is set then only nodes that have no nodes (leaves, terminal nodes) will be considered. if leavesOnly, only terminal leaves (no children) are included if excludeSel, any leaf nodes that are within the current edit selection are excluded,

func (*SVG) SelectWithinBBox 

func (sv *SVG) SelectWithinBBox(bbox image.Rectangle, leavesOnly bool) []svg.Node

SelectWithinBBox returns a list of all nodes whose BBox is fully contained within the given BBox. SVG version excludes layer groups.

func (*SVG) SetBBoxSpritePos 

func (sv *SVG) SetBBoxSpritePos(typ Sprites, idx int, bbox math32.Box2)

SetBBoxSpritePos sets positions of given type of sprites

func (*SVG) SetMetaData 

func (sv *SVG) SetMetaData()

SetMetaData sets meta data of drawing

func (*SVG) SetRubberBand 

func (sv *SVG) SetRubberBand(cur image.Point)

SetRubberBand updates the rubber band position.

func (*SVG) SetSVGName 

func (sv *SVG) SetSVGName(el svg.Node)

SetSVGName sets the name of the element to standard type + id name

func (*SVG) SetSelSpritePos 

func (sv *SVG) SetSelSpritePos()

func (*SVG) ShowAlignMatches 

func (sv *SVG) ShowAlignMatches(pts []image.Rectangle, typs []BBoxPoints)

ShowAlignMatches draws the align matches as given between BBox Min - Max. typs are corresponding bounding box sources.

func (*SVG) SizeFinal 

func (sv *SVG) SizeFinal()

func (*SVG) SnapBBox 

func (sv *SVG) SnapBBox(rawbb math32.Box2) math32.Box2

SnapBBox does snapping on given raw bbox according to settings, aligning movement of bbox edges / centers relative to other bboxes.. returns snapped bbox.

func (*SVG) SnapPoint 

func (sv *SVG) SnapPoint(rawpt math32.Vector2) math32.Vector2

SnapPoint does snapping on one raw point, given that point, in window coordinates. returns the snapped point.

func (*SVG) SnapPointToVector 

func (sv *SVG) SnapPointToVector(rawpt math32.Vector2) math32.Vector2

func (*SVG) SpriteReshapeDrag 

func (sv *SVG) SpriteReshapeDrag(sp Sprites, e events.Event)

SpriteReshapeDrag processes a mouse reshape drag event on a selection sprite

func (*SVG) SpriteRotateDrag 

func (sv *SVG) SpriteRotateDrag(sp Sprites, delta image.Point)

SpriteRotateDrag processes a mouse rotate drag event on a selection sprite

func (*SVG) TransformAllLeaves 

func (sv *SVG) TransformAllLeaves(trans math32.Vector2, scale math32.Vector2, rot float32, pt math32.Vector2)

TransformAllLeaves transforms all the leaf items in the drawing (not groups) uses ApplyDeltaTransform manipulation.

func (*SVG) Undo 

func (sv *SVG) Undo() string

Undo undoes one step, returning the action that was undone

func (*SVG) UndoSave 

func (sv *SVG) UndoSave(action, data string)

UndoSave save current state for potential undo

func (*SVG) UndoSaveReplace 

func (sv *SVG) UndoSaveReplace(action, data string)

UndoSaveReplace save current state to replace current

func (*SVG) UpdateGradients 

func (sv *SVG) UpdateGradients(gl []*Gradient)

UpdateGradients update SVG gradients from given gradient list

func (*SVG) UpdateGridEff 

func (sv *SVG) UpdateGridEff()

UpdateGridEff updates the GirdEff value based on current scale

func (*SVG) UpdateNodeSprites 

func (sv *SVG) UpdateNodeSprites()

func (*SVG) UpdateSelSprites 

func (sv *SVG) UpdateSelSprites()

func (*SVG) UpdateSelect 

func (sv *SVG) UpdateSelect()

UpdateSelect should be called whenever selection changes

func (*SVG) UpdateView 

func (sv *SVG) UpdateView(full bool)

UpdateView updates the view, optionally with a full re-render

func (*SVG) ZoomAt 

func (sv *SVG) ZoomAt(pt image.Point, delta float32)

ZoomAt updates the scale and translate parameters at given point by given delta: + means zoom in, - means zoom out, delta should always be < 1)

func (*SVG) ZoomToContents 

func (sv *SVG) ZoomToContents(width bool)

ZoomToContents sets the scale to fit the current contents into view

func (*SVG) ZoomToPage 

func (sv *SVG) ZoomToPage(width bool)

ZoomToPage sets the scale to fit the current viewbox

type SelectedState 

type SelectedState struct {

	// order item was selected
	Order int

	// initial geometry, saved when first selected or start dragging -- manipulations restore then transform from there
	InitGeom []float32
}

SelectedState is state for selected nodes

type SettingsData 

type SettingsData struct {
	core.SettingsBase

	// default physical size, when app is started without opening a file
	Size PhysSize

	// default shape styles
	ShapeStyle styles.Paint

	// default text styles
	TextStyle styles.Paint

	// default line styles
	PathStyle styles.Paint

	// default line styles
	LineStyle styles.Paint

	// turns on the grid display
	GridDisp bool

	// snap positions and sizes to underlying grid
	SnapGrid bool

	// snap positions and sizes to line up with other elements
	SnapGuide bool

	// snap node movements to align with guides
	SnapNodes bool

	// number of screen pixels around target point (in either direction) to snap
	SnapTol int `min:"1"`

	// named-split config in use for configuring the splitters
	SplitName SplitName

	// environment variables to set for this app -- if run from the command line, standard shell environment variables are inherited, but on some OS's (Mac), they are not set when run as a gui app
	EnvVars map[string]string
}

SettingsData is the overall Vector settings

func (*SettingsData) Apply 

func (se *SettingsData) Apply()

Apply settings updates things according with settings

func (*SettingsData) Defaults 

func (se *SettingsData) Defaults()

func (*SettingsData) EditSplits 

func (se *SettingsData) EditSplits()

EditSplits opens the SplitsView editor to customize saved splitter settings

func (*SettingsData) Open 

func (se *SettingsData) Open() error

func (*SettingsData) Save 

func (se *SettingsData) Save() error

func (*SettingsData) Update 

func (se *SettingsData) Update()

type Split 

type Split struct {

	// name of splitter config
	Name string

	// brief description
	Desc string

	// splitter panel proportions
	Splits []float32 `min:"0" max:"1" step:".05"` // TODO: convert to [4]float32 !!
}

Split is a named splitter configuration

func (Split) Label 

func (sp Split) Label() string

Label satisfies the Labeler interface

func (*Split) SaveSplits 

func (lt *Split) SaveSplits(sp []float32)

SaveSplits saves given splits to this setting -- must use copy!

type SplitName 

type SplitName string

SplitName has an associated ValueView for selecting from the list of available named splits

func (SplitName) Value 

func (sn SplitName) Value() core.Value

Value registers core.Chooser as the core.Value widget for SplitName

type Splits 

type Splits []*Split

Splits is a list of named splitter configurations 

var AvailableSplits Splits

AvailableSplits are available named splitter settings. can be loaded / saved / edited with settings. This is set to StandardSplits at startup.

func (*Splits) Add 

func (lt *Splits) Add(name, desc string, splits []float32) (*Split, int)

Add adds a new splitter setting, returns split and index

func (*Splits) CopyFrom 

func (lt *Splits) CopyFrom(cp Splits)

CopyFrom copies named splits from given other map

func (*Splits) FixLen 

func (lt *Splits) FixLen()

FixLen ensures that there are exactly 4 splits in each

func (*Splits) Names 

func (lt *Splits) Names() []string

Names returns a slice of current names

func (*Splits) Open 

func (lt *Splits) Open(filename core.Filename) error

Open opens named splits from a json-formatted file.

func (*Splits) OpenSettings 

func (lt *Splits) OpenSettings() error

OpenSettings opens Splits from App standard prefs directory, using PrefSplitsFilename

func (*Splits) Save 

func (lt *Splits) Save(filename core.Filename) error

Save saves named splits to a json-formatted file.

func (*Splits) SaveSettings 

func (lt *Splits) SaveSettings() error

SaveSettings saves Splits to App standard prefs directory, using PrefSplitsFilename

func (*Splits) SplitByName 

func (lt *Splits) SplitByName(name SplitName) (*Split, int, bool)

SplitByName returns a named split and index by name -- returns false and emits a message to stdout if not found

type Sprites 

type Sprites int32 //enums:enum

Sprites are the type of sprite 

const (
	// SpUnk is an unknown sprite type
	SpUnk Sprites = iota

	// SpReshapeBBox is a reshape bbox -- the overall active selection BBox
	// for active manipulation
	SpReshapeBBox

	// SpSelBBox is a selection bounding box -- display only
	SpSelBBox

	// SpNodePoint is a main coordinate point for path node
	SpNodePoint

	// SpNodeCtrl is a control coordinate point for path node
	SpNodeCtrl

	// SpRubberBand is the draggable sel box
	// subtyp = UpC, LfM, RtM, DnC for sides
	SpRubberBand

	// SpAlignMatch is an alignment match (n of these),
	// subtyp is actually BBoxPoints so we just hack cast that
	SpAlignMatch

	// Sprite bounding boxes are set as a "bbox" property on sprites
	SpBBoxUpL
	SpBBoxUpC
	SpBBoxUpR
	SpBBoxDnL
	SpBBoxDnC
	SpBBoxDnR
	SpBBoxLfM
	SpBBoxRtM
)
const SpritesN Sprites = 15

SpritesN is the highest valid value for type Sprites, plus one.

func SpriteProperties 

func SpriteProperties(sp *core.Sprite) (typ, subtyp Sprites, idx int)

SpriteProperties reads the sprite properties -- returns SpUnk if not one of our sprites.

func SpritesValues 

func SpritesValues() []Sprites

SpritesValues returns all possible values for the type Sprites.

func (Sprites) Desc 

func (i Sprites) Desc() string

Desc returns the description of the Sprites value.

func (Sprites) Int64 

func (i Sprites) Int64() int64

Int64 returns the Sprites value as an int64.

func (Sprites) MarshalText 

func (i Sprites) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Sprites) SetInt64 

func (i *Sprites) SetInt64(in int64)

SetInt64 sets the Sprites value from an int64.

func (*Sprites) SetString 

func (i *Sprites) SetString(s string) error

SetString sets the Sprites value from its string representation, and returns an error if the string is invalid.

func (Sprites) String 

func (i Sprites) String() string

String returns the string representation of this Sprites value.

func (*Sprites) UnmarshalText 

func (i *Sprites) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Sprites) Values 

func (i Sprites) Values() []enums.Enum

Values returns all possible values for the type Sprites.

type StandardSizeValues 

type StandardSizeValues struct {
	Units units.Units
	X     float32
	Y     float32
}

StandardSizeValues are values for standard sizes

type StandardSizes 

type StandardSizes int32 //enums:enum

StandardSizes are standard physical drawing sizes 

const (
	// CustomSize =  nonstandard
	CustomSize StandardSizes = iota

	// Image 1280x720 Px = 720p
	Img1280x720

	// Image 1920x1080 Px = 1080p HD
	Img1920x1080

	// Image 3840x2160 Px = 4K
	Img3840x2160

	// Image 7680x4320 Px = 8K
	Img7680x4320

	// Image 1024x768 Px = XGA
	Img1024x768

	// Image 720x480 Px = DVD
	Img720x480

	// Image 640x480 Px = VGA
	Img640x480

	// Image 320x240 Px = old CRT
	Img320x240

	// A4 = 210 x 297 mm
	A4

	// USLetter = 8.5 x 11 in = 612 x 792 pt
	USLetter

	// USLegal = 8.5 x 14 in = 612 x 1008 pt
	USLegal

	// A0 = 841 x 1189 mm
	A0

	// A1 = 594 x 841 mm
	A1

	// A2 = 420 x 594 mm
	A2

	// A3 = 297 x 420 mm
	A3

	// A5 = 148 x 210 mm
	A5

	// A6 = 105 x 148 mm
	A6

	// A7 = 74 x 105
	A7

	// A8 = 52 x 74 mm
	A8

	// A9 = 37 x 52
	A9

	// A10 = 26 x 37
	A10
)
const StandardSizesN StandardSizes = 22

StandardSizesN is the highest valid value for type StandardSizes, plus one.

func MatchStandardSize 

func MatchStandardSize(wd, ht float32, un units.Units) StandardSizes

func StandardSizesValues 

func StandardSizesValues() []StandardSizes

StandardSizesValues returns all possible values for the type StandardSizes.

func (StandardSizes) Desc 

func (i StandardSizes) Desc() string

Desc returns the description of the StandardSizes value.

func (StandardSizes) Int64 

func (i StandardSizes) Int64() int64

Int64 returns the StandardSizes value as an int64.

func (StandardSizes) MarshalText 

func (i StandardSizes) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*StandardSizes) SetInt64 

func (i *StandardSizes) SetInt64(in int64)

SetInt64 sets the StandardSizes value from an int64.

func (*StandardSizes) SetString 

func (i *StandardSizes) SetString(s string) error

SetString sets the StandardSizes value from its string representation, and returns an error if the string is invalid.

func (StandardSizes) String 

func (i StandardSizes) String() string

String returns the string representation of this StandardSizes value.

func (*StandardSizes) UnmarshalText 

func (i *StandardSizes) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (StandardSizes) Values 

func (i StandardSizes) Values() []enums.Enum

Values returns all possible values for the type StandardSizes.

type TextStyle 

type TextStyle struct {

	// current text to edit
	Text string

	// font family
	Font core.FontName `xml:"font-family"`

	// font size
	Size units.Value `xml:"font-size"`

	// prop: font-style = style -- normal, italic, etc
	Style styles.FontStyles `xml:"font-style" inherit:"true"`

	// prop: font-weight = weight: normal, bold, etc
	Weight styles.FontWeights `xml:"font-weight" inherit:"true"`

	// prop: font-stretch = font stretch / condense options
	Stretch styles.FontStretch `xml:"font-stretch" inherit:"true"`

	// prop: font-variant = normal or small caps
	Variant styles.FontVariants `xml:"font-variant" inherit:"true"`

	// prop: text-decoration = underline, line-through, etc -- not inherited
	Deco styles.TextDecorations `xml:"text-decoration"`

	// prop: baseline-shift = super / sub script -- not inherited
	Shift styles.BaselineShifts `xml:"baseline-shift"`

	// prop: text-align (inherited) = how to align text, horizontally. This *only* applies to the text within its containing element, and is typically relevant only for multi-line text: for single-line text, if element does not have a specified size that is different from the text size, then this has *no effect*.
	Align styles.Aligns `xml:"text-align" inherit:"true"`

	// font value view for font toolbar
	FontButton core.FontButton `display:"-"`

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

TextStyle is text styling info -- using Form to do text editor

func (*TextStyle) Defaults 

func (ts *TextStyle) Defaults()

func (*TextStyle) SetFromFontStyle 

func (ts *TextStyle) SetFromFontStyle(fs *styles.Font)

SetFromFontStyle sets from standard styles.Font style

func (*TextStyle) SetFromNode 

func (ts *TextStyle) SetFromNode(txt *svg.Text)

SetFromNode sets text style info from given svg.Text node

func (*TextStyle) TextProperties 

func (ts *TextStyle) TextProperties() map[string]string

TextProperties returns non-default text properties to set

func (*TextStyle) Update 

func (ts *TextStyle) Update()

type Tools 

type Tools int //enums:enum

Tools are the drawing tools 

const (
	SelectTool Tools = iota
	NodeTool
	RectTool
	EllipseTool
	BezierTool
	TextTool
)
const ToolsN Tools = 6

ToolsN is the highest valid value for type Tools, plus one.

func ToolsValues 

func ToolsValues() []Tools

ToolsValues returns all possible values for the type Tools.

func (Tools) Desc 

func (i Tools) Desc() string

Desc returns the description of the Tools value.

func (Tools) Int64 

func (i Tools) Int64() int64

Int64 returns the Tools value as an int64.

func (Tools) MarshalText 

func (i Tools) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface.

func (*Tools) SetInt64 

func (i *Tools) SetInt64(in int64)

SetInt64 sets the Tools value from an int64.

func (*Tools) SetString 

func (i *Tools) SetString(s string) error

SetString sets the Tools value from its string representation, and returns an error if the string is invalid.

func (Tools) String 

func (i Tools) String() string

String returns the string representation of this Tools value.

func (*Tools) UnmarshalText 

func (i *Tools) UnmarshalText(text []byte) error

UnmarshalText implements the encoding.TextUnmarshaler interface.

func (Tools) Values 

func (i Tools) Values() []enums.Enum

Values returns all possible values for the type Tools.

type Tree 

type Tree struct {
	core.Tree

	// the parent [Canvas]
	Canvas *Canvas `copier:"-" json:"-" xml:"-" display:"-"`
}

Tree is a core.Tree that interacts properly with Canvas.

func NewTree 

func NewTree(parent ...tree.Node) *Tree

NewTree returns a new Tree with the given optional parent: Tree is a core.Tree that interacts properly with Canvas.

func (*Tree) Init 

func (tv *Tree) Init()

func (*Tree) LayerClearCurrent 

func (tv *Tree) LayerClearCurrent()

LayerClearCurrent clears this layer as the current layer if it was set as such.

func (*Tree) LayerIsCurrent 

func (tv *Tree) LayerIsCurrent() bool

LayerIsCurrent returns true if layer is the current active one for creating

func (*Tree) LayerSetCurrent 

func (tv *Tree) LayerSetCurrent()

LayerSetCurrent sets this layer as the current layer name

func (*Tree) LayerToggleLock 

func (tv *Tree) LayerToggleLock()

LayerToggleLock toggles whether layer is locked or not

func (*Tree) LayerToggleVis 

func (tv *Tree) LayerToggleVis()

LayerToggleVis toggles visibility of the layer

func (*Tree) SelectSVG 

func (tv *Tree) SelectSVG()

SelectSVG

func (*Tree) SetCanvas 

func (t *Tree) SetCanvas(v *Canvas) *Tree

SetCanvas sets the [Tree.Canvas]: the parent Canvas

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