81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
package draw2dimg
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import (
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"image"
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"image/draw"
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"code.google.com/p/freetype-go/freetype/raster"
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"code.google.com/p/freetype-go/freetype/truetype"
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"github.com/llgcode/draw2d"
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"github.com/llgcode/draw2d/draw2dbase"
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)
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type Drawer struct {
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matrix draw2d.Matrix
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img draw.Image
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painter Painter
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fillRasterizer *raster.Rasterizer
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strokeRasterizer *raster.Rasterizer
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glyphBuf *truetype.GlyphBuf
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}
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func NewDrawer(img *image.RGBA) *Drawer {
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width, height := img.Bounds().Dx(), img.Bounds().Dy()
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return &Drawer{
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draw2d.NewIdentityMatrix(),
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img,
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raster.NewRGBAPainter(img),
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raster.NewRasterizer(width, height),
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raster.NewRasterizer(width, height),
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truetype.NewGlyphBuf(),
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}
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}
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func (d *Drawer) Matrix() *draw2d.Matrix {
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return &d.matrix
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}
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func (d *Drawer) Fill(path *draw2d.Path, style draw2d.FillStyle) {
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switch fillStyle := style.(type) {
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case draw2d.SolidFillStyle:
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d.fillRasterizer.UseNonZeroWinding = fillStyle.FillRule == draw2d.FillRuleWinding
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d.painter.SetColor(fillStyle.Color)
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default:
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panic("FillStyle not supported")
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}
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flattener := draw2dbase.Transformer{d.matrix, draw2dbase.FtLineBuilder{d.fillRasterizer}}
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draw2dbase.Flatten(path, flattener, d.matrix.GetScale())
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d.fillRasterizer.Rasterize(d.painter)
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d.fillRasterizer.Clear()
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}
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func (d *Drawer) Stroke(path *draw2d.Path, style draw2d.StrokeStyle) {
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d.strokeRasterizer.UseNonZeroWinding = true
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stroker := draw2dbase.NewLineStroker(style.LineCap, style.LineJoin, draw2dbase.Transformer{d.matrix, draw2dbase.FtLineBuilder{d.strokeRasterizer}})
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stroker.HalfLineWidth = style.Width / 2
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var liner draw2dbase.Flattener
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if style.Dash != nil && len(style.Dash) > 0 {
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liner = draw2dbase.NewDashConverter(style.Dash, style.DashOffset, stroker)
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} else {
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liner = stroker
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}
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draw2dbase.Flatten(path, liner, d.matrix.GetScale())
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d.painter.SetColor(style.Color)
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d.strokeRasterizer.Rasterize(d.painter)
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d.strokeRasterizer.Clear()
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}
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func (d *Drawer) Text(text string, x, y float64, style draw2d.TextStyle) {
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}
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func (d *Drawer) Image(image image.Image, x, y float64, scaling draw2d.ImageScaling) {
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}
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