draw2dimg

README

draw2d/draw2dimg

draw2d implementation that generates raster images using https://github.com/golang/freetype package.

Documentation

Index

• func DrawImage(src image.Image, dest draw.Image, tr draw2d.Matrix, op draw.Op, ...)
• func LoadFromPngFile(filePath string) (image.Image, error)
• func SaveToPngFile(filePath string, m image.Image) error
• type FtLineBuilder
  • func (liner FtLineBuilder) Close()
  • func (liner FtLineBuilder) End()
  • func (liner FtLineBuilder) LineJoin()
  • func (liner FtLineBuilder) LineTo(x, y float64)
  • func (liner FtLineBuilder) MoveTo(x, y float64)
• type GraphicContext
  • func NewGraphicContext(img draw.Image) *GraphicContext
  • func NewGraphicContextWithPainter(img draw.Image, painter Painter) *GraphicContext
  • func (gc *GraphicContext) Clear()
  • func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int)
  • func (gc *GraphicContext) DrawImage(img image.Image)
  • func (gc *GraphicContext) Fill(paths ...*draw2d.Path)
  • func (gc *GraphicContext) FillString(text string) (width float64)
  • func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64)
  • func (gc *GraphicContext) FillStroke(paths ...*draw2d.Path)
  • func (gc *GraphicContext) Stroke(paths ...*draw2d.Path)
  • func (gc *GraphicContext) StrokeString(text string) (width float64)
  • func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float64)
• type ImageFilter
• type Painter

Functions

func DrawImage

func DrawImage(src image.Image, dest draw.Image, tr draw2d.Matrix, op draw.Op, filter ImageFilter)

DrawImage draws an image into dest using an affine transformation matrix, an op and a filter

func LoadFromPngFile

func LoadFromPngFile(filePath string) (image.Image, error)

LoadFromPngFile Open a png file

func SaveToPngFile

func SaveToPngFile(filePath string, m image.Image) error

SaveToPngFile create and save an image to a file using PNG format

Types

type FtLineBuilder

type FtLineBuilder struct {
	Adder raster.Adder
}

func (FtLineBuilder) Close

func (liner FtLineBuilder) Close()

func (FtLineBuilder) End

func (liner FtLineBuilder) End()

func (FtLineBuilder) LineJoin

func (liner FtLineBuilder) LineJoin()

func (FtLineBuilder) LineTo

func (liner FtLineBuilder) LineTo(x, y float64)

func (FtLineBuilder) MoveTo

func (liner FtLineBuilder) MoveTo(x, y float64)

type GraphicContext

type GraphicContext struct {
	*draw2dbase.StackGraphicContext
	// contains filtered or unexported fields
}

GraphicContext is the implementation of draw2d.GraphicContext for a raster image

func NewGraphicContext

func NewGraphicContext(img draw.Image) *GraphicContext

NewGraphicContext creates a new Graphic context from an image.

func NewGraphicContextWithPainter

func NewGraphicContextWithPainter(img draw.Image, painter Painter) *GraphicContext

NewGraphicContextWithPainter creates a new Graphic context from an image and a Painter (see Freetype-go)

func (*GraphicContext) Clear

func (gc *GraphicContext) Clear()

Clear fills the current canvas with a default transparent color

func (*GraphicContext) ClearRect

func (gc *GraphicContext) ClearRect(x1, y1, x2, y2 int)

ClearRect fills the current canvas with a default transparent color at the specified rectangle

func (*GraphicContext) DrawImage

func (gc *GraphicContext) DrawImage(img image.Image)

DrawImage draws the raster image in the current canvas

func (*GraphicContext) Fill

func (gc *GraphicContext) Fill(paths ...*draw2d.Path)

Fill fills the paths with the color specified by SetFillColor

func (*GraphicContext) FillString

func (gc *GraphicContext) FillString(text string) (width float64)

FillString draws the text at point (0, 0)

func (*GraphicContext) FillStringAt

func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64)

FillStringAt draws the text at the specified point (x, y)

func (*GraphicContext) FillStroke

func (gc *GraphicContext) FillStroke(paths ...*draw2d.Path)

FillStroke first fills the paths and than strokes them

func (*GraphicContext) Stroke

func (gc *GraphicContext) Stroke(paths ...*draw2d.Path)

Stroke strokes the paths with the color specified by SetStrokeColor

func (*GraphicContext) StrokeString

func (gc *GraphicContext) StrokeString(text string) (width float64)

StrokeString draws the contour of the text at point (0, 0)

func (*GraphicContext) StrokeStringAt

func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float64)

StrokeStringAt draws the contour of the text at point (x, y)

type ImageFilter

type ImageFilter int

ImageFilter defines the type of filter to use

const (
	// LinearFilter defines a linear filter
	LinearFilter ImageFilter = iota
	// BilinearFilter defines a bilinear filter
	BilinearFilter
	// BicubicFilter defines a bicubic filter
	BicubicFilter
)

type Painter

type Painter interface {
	raster.Painter
	SetColor(color color.Color)
}

Painter implements the freetype raster.Painter and has a SetColor method like the RGBAPainter