svg

package
v0.6.1 Latest Latest
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 Go to latest Published: Dec 23, 2022 License: MIT Imports: 8 Imported by: 0

Documentation

Overview

Example 
package main

import (
	"encoding/xml"
	"image"
	"image/color"
	"log"
	"os"

	"github.com/owulveryck/wardleyToGo/internal/svg"
)

func main() {
	s := svg.SVG{
		Width:               "100%",
		Height:              "100%",
		PreserveAspectRatio: "xMidYMid meet",
		ViewBox:             "0 0 1050 1050",
	}.StartSVG()
	enc := xml.NewEncoder(os.Stdout)
	enc.Indent("", "    ")
	enc.EncodeToken(s)
	enc.Encode(svg.Rectangle{
		R:    image.Rect(0, 0, 1050, 1050),
		Fill: svg.Color{color.Gray{Y: 128}},
	})
	enc.Encode(svg.Defs{
		Gradient: svg.LinearGradient{
			ID: "wardleyGradient",
			X1: "0%", Y1: "0%", X2: "100%", Y2: "0%",
			Stops: []svg.Stop{
				{
					Offset:    "0%",
					StopColor: svg.Color{color.RGBA{196, 196, 196, 255}},
				},
				{
					Offset:    "30%",
					StopColor: svg.White,
				},
				{
					Offset:    "70%",
					StopColor: svg.White,
				},
				{
					Offset:    "100%",
					StopColor: svg.Color{color.RGBA{196, 196, 196, 255}},
				},
			},
		},
		Markers: []svg.Marker{
			{
				ID:           "arrow",
				RefX:         15,
				RefY:         0,
				MarkerWidth:  12,
				MarkerHeight: 12,
				ViewBox:      "0 -5 10 10",
				Path: &svg.Path{
					D:    "M0,-5L10,0L0,5",
					Fill: svg.Red,
				},
			},
			{
				ID:           "graphArrow",
				RefX:         9,
				RefY:         0,
				MarkerWidth:  12,
				MarkerHeight: 12,
				ViewBox:      "0 -5 10 10",
				Path: &svg.Path{
					D:    "M0,-5L10,0L0,5",
					Fill: svg.Color{color.Black}},
			},
		},
	})
	enc.Encode(svg.Rectangle{
		R:     image.Rect(25, 25, 1000, 1000),
		Style: "fill:url(#wardleyGradient)",
	})

	enc.Encode(svg.Transform{
		Rotate:    270,
		Translate: image.Point{25, 1025},
		Components: []interface{}{
			svg.Line{
				F:           image.Point{0, 0},
				T:           image.Point{1000, 0},
				Stroke:      svg.Color{color.Black},
				StrokeWidth: "1",
				MarkerEnd:   "url(#graphArrow)",
			},
			svg.Line{
				F:               image.Point{0, 173},
				T:               image.Point{1000, 173},
				Stroke:          svg.Gray(0xb8),
				StrokeWidth:     "1",
				StrokeDashArray: []int{2, 2},
			},
			svg.Line{
				F:               image.Point{0, 400},
				T:               image.Point{1000, 400},
				Stroke:          svg.Gray(0xb8),
				StrokeWidth:     "1",
				StrokeDashArray: []int{2, 2},
			},
			svg.Line{
				F:               image.Point{0, 700},
				T:               image.Point{1000, 700},
				Stroke:          svg.Gray(0xb8),
				StrokeWidth:     "1",
				StrokeDashArray: []int{2, 2},
			},
			svg.Text{
				P:          image.Point{5, -10},
				Text:       []byte(`Invisible`),
				TextAnchor: svg.TextAnchorStart,
			},
			svg.Text{
				P:          image.Point{995, -10},
				Text:       []byte(`Visible`),
				TextAnchor: svg.TextAnchorEnd,
			},
			svg.Text{
				P:          image.Point{500, -10},
				Text:       []byte(`Value Chain`),
				TextAnchor: svg.TextAnchorMiddle,
				FontWeight: "bold",
			},
		},
	})
	enc.Encode(svg.Line{
		F:         image.Point{25, 1025},
		T:         image.Point{1025, 1025},
		Stroke:    svg.Color{color.Black},
		MarkerEnd: "url(#graphArrrow)",
	})
	enc.Encode(svg.Text{
		P:          image.Point{32, 40},
		FontWeight: "bold",
		FontSize:   "11px",
		Text:       []byte(`Uncharted`),
		TextAnchor: svg.TextAnchorStart,
	})
	enc.Encode(svg.Text{
		P:          image.Point{1020, 40},
		FontWeight: "bold",
		FontSize:   "11px",
		Text:       []byte(`Industrialised`),
		TextAnchor: svg.TextAnchorEnd,
	})
	enc.Encode(svg.Text{
		P:    image.Point{25, 1040},
		Text: []byte(`Genesis`),
	})
	enc.Encode(svg.Text{
		P:    image.Point{198, 1040},
		Text: []byte(`Custom-Built`),
	})
	enc.Encode(svg.Text{
		P:    image.Point{425, 1040},
		Text: []byte(`Product (+rental)`),
	})
	enc.Encode(svg.Text{
		P:    image.Point{725, 1040},
		Text: []byte(`Commodity (+utility)`),
	})
	enc.Encode(svg.Text{
		P:          image.Point{1025, 1040},
		TextAnchor: svg.TextAnchorEnd,
		FontWeight: "bold",
		Text:       []byte(`Evolution`),
	})
	err := enc.EncodeToken(s.End())
	if err != nil {
		log.Fatal(err)
	}
	enc.Flush()
}

Output:

	<svg width="100%" height="100%" viewBox="0 0 1050 1050" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" preserveAspectRatio="xMidYMid meet">
    <rect x="0" y="0" width="1050" height="1050" fill="rgb(128,128,128)" fill-opacity="1.0"></rect>
    <defs>
        <linearGradient id="wardleyGradient" x1="0%" y1="0%" x2="100%" y2="0%">
            <stop offset="0%" stop-color="rgb(196,196,196)"></stop>
            <stop offset="30%" stop-color="rgb(255,255,255)"></stop>
            <stop offset="70%" stop-color="rgb(255,255,255)"></stop>
            <stop offset="100%" stop-color="rgb(196,196,196)"></stop>
        </linearGradient>
        <marker id="arrow" refX="15" refY="0" markerWidth="12" markerHeight="12" viewBox="0 -5 10 10">
            <path d="M0,-5L10,0L0,5" fill="rgb(255,0,0)"></path>
        </marker>
        <marker id="graphArrow" refX="9" refY="0" markerWidth="12" markerHeight="12" viewBox="0 -5 10 10">
            <path d="M0,-5L10,0L0,5" fill="rgb(0,0,0)"></path>
        </marker>
    </defs>
    <rect x="25" y="25" width="975" height="975" style="fill:url(#wardleyGradient)"></rect>
    <g transform=" translate(25,1025) rotate(270)">
        <line x1="0" y1="0" x2="1000" y2="0" stroke-width="1" marker-end="url(#graphArrow)" stroke="rgb(0,0,0)" stroke-opacity="1.0"></line>
        <line x1="0" y1="173" x2="1000" y2="173" stroke-width="1" stroke-dasharray="2 2" stroke="rgb(184,184,184)" stroke-opacity="1.0"></line>
        <line x1="0" y1="400" x2="1000" y2="400" stroke-width="1" stroke-dasharray="2 2" stroke="rgb(184,184,184)" stroke-opacity="1.0"></line>
        <line x1="0" y1="700" x2="1000" y2="700" stroke-width="1" stroke-dasharray="2 2" stroke="rgb(184,184,184)" stroke-opacity="1.0"></line>
        <text x="5" y="-10" text-anchor="start">Invisible</text>
        <text x="995" y="-10" text-anchor="end">Visible</text>
        <text x="500" y="-10" font-weight="bold" text-anchor="middle">Value Chain</text>
    </g>
    <line x1="25" y1="1025" x2="1025" y2="1025" marker-end="url(#graphArrrow)" stroke="rgb(0,0,0)" stroke-opacity="1.0"></line>
    <text x="32" y="40" font-weight="bold" font-size="11px" text-anchor="start">Uncharted</text>
    <text x="1020" y="40" font-weight="bold" font-size="11px" text-anchor="end">Industrialised</text>
    <text x="25" y="1040">Genesis</text>
    <text x="198" y="1040">Custom-Built</text>
    <text x="425" y="1040">Product (+rental)</text>
    <text x="725" y="1040">Commodity (+utility)</text>
    <text x="1025" y="1040" font-weight="bold" text-anchor="end">Evolution</text>
</svg>

Index

Examples

Constants

View Source 
const (
	TextAnchorUndefined int = iota
	TextAnchorStart
	TextAnchorMiddle
	TextAnchorEnd
)

Variables

View Source 
var (
	Black = Color{color.Black}
	Red   = Color{color.RGBA{0xff, 0x00, 0x00, 0xff}}
	White = Color{color.White}
)

Functions

func UpdateDefaultFont added in v0.6.0 

func UpdateDefaultFont(fontName string)

Types

type Circle 

type Circle struct {
	P           image.Point
	R           int
	Fill        Color
	Stroke      Color
	StrokeWidth string
}

func (Circle) MarshalXML 

func (c Circle) MarshalXML(e *xml.Encoder, start xml.StartElement) error

type Color 

type Color struct {
	color.Color
}

func Gray 

func Gray(Y uint8) Color

func (Color) MarshalXMLAttr 

func (c Color) MarshalXMLAttr(name xml.Name) (xml.Attr, error)

type Defs 

type Defs struct {
	XMLName  xml.Name `xml:"defs"`
	Gradient LinearGradient
	Markers  []Marker
}

type Line 

type Line struct {
	F, T            image.Point
	Stroke          Color
	StrokeWidth     string
	StrokeDashArray []int
	MarkerEnd       string
	Class           string
}

func (Line) MarshalXML 

func (l Line) MarshalXML(e *xml.Encoder, start xml.StartElement) error

type LinearGradient 

type LinearGradient struct {
	XMLName xml.Name `xml:"linearGradient" `
	ID      string   `xml:"id,attr,omitempty"`
	X1      string   `xml:"x1,attr"`
	Y1      string   `xml:"y1,attr"`
	X2      string   `xml:"x2,attr"`
	Y2      string   `xml:"y2,attr"`
	Stops   []Stop
}

type Marker 

type Marker struct {
	XMLName      xml.Name `xml:"marker"`
	ID           string   `xml:"id,attr"`
	RefX         int      `xml:"refX,attr"`
	RefY         int      `xml:"refY,attr"`
	MarkerWidth  int      `xml:"markerWidth,attr"`
	MarkerHeight int      `xml:"markerHeight,attr"`
	ViewBox      string   `xml:"viewBox,attr,omitempty"`
	Path         *Path    `xml:",omitempty"`
	Polygon      *Polygon `xml:",omitempty"`
}

type Path 

type Path struct {
	XMLName xml.Name `xml:"path"`
	D       string   `xml:"d,attr"`
	Fill    Color    `xml:"fill,attr"`
}

type Polygon 

type Polygon struct {
	XMLName     xml.Name `xml:"polygon"`
	Points      []image.Point
	Fill        Color
	Stroke      Color
	StrokeWidth int
}

func (*Polygon) MarshalXML 

func (p *Polygon) MarshalXML(e *xml.Encoder, start xml.StartElement) error

type Rectangle 

type Rectangle struct {
	R           image.Rectangle
	Rx, Ry      int
	Fill        Color
	Stroke      Color
	StrokeWidth string
	Style       string
}

func (Rectangle) MarshalXML 

func (r Rectangle) MarshalXML(e *xml.Encoder, start xml.StartElement) error

type SVG 

type SVG struct {
	Width               string
	Height              string
	Class               string
	PreserveAspectRatio string
	ViewBox             string
}

func (SVG) StartSVG 

func (s SVG) StartSVG() xml.StartElement

type Stop 

type Stop struct {
	XMLName   xml.Name `xml:"stop"`
	Offset    string   `xml:"offset,attr"`
	StopColor Color    `xml:"stop-color,attr"`
}

type Text 

type Text struct {
	P          image.Point
	Text       []byte
	Fill       Color
	TextAnchor int
	FontWeight string
	FontSize   string
	FontFamily string
}

func (Text) MarshalXML 

func (t Text) MarshalXML(e *xml.Encoder, start xml.StartElement) error

type Transform 

type Transform struct {
	Translate  image.Point
	Rotate     int
	Scale      float32
	Components []interface{}
}

func (Transform) MarshalXML 

func (t Transform) MarshalXML(e *xml.Encoder, start xml.StartElement) error

Source Files

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