74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
// Copyright 2010 The draw2d Authors. All rights reserved.
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// created: 13/12/2010 by Laurent Le Goff
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package draw2d
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import (
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"code.google.com/p/freetype-go/freetype/raster"
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"github.com/llgcode/draw2d/path"
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)
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type VertexAdder struct {
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adder raster.Adder
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}
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func NewVertexAdder(adder raster.Adder) *VertexAdder {
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return &VertexAdder{adder}
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}
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func (vertexAdder *VertexAdder) MoveTo(x, y float64) {
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vertexAdder.adder.Start(raster.Point{raster.Fix32(x * 256), raster.Fix32(y * 256)})
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}
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func (vertexAdder *VertexAdder) LineTo(x, y float64) {
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vertexAdder.adder.Add1(raster.Point{raster.Fix32(x * 256), raster.Fix32(y * 256)})
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}
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func (vertexAdder *VertexAdder) LineJoin() {
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}
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func (vertexAdder *VertexAdder) Close() {
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}
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func (vertexAdder *VertexAdder) End() {
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}
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type PathAdder struct {
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adder raster.Adder
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firstPoint raster.Point
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ApproximationScale float64
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}
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func NewPathAdder(adder raster.Adder) *PathAdder {
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return &PathAdder{adder, raster.Point{0, 0}, 1}
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}
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func (pathAdder *PathAdder) Convert(paths ...*path.Path) {
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for _, apath := range paths {
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j := 0
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for _, cmd := range apath.Components {
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switch cmd {
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case path.MoveToCmp:
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pathAdder.firstPoint = raster.Point{raster.Fix32(apath.Points[j] * 256), raster.Fix32(apath.Points[j+1] * 256)}
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pathAdder.adder.Start(pathAdder.firstPoint)
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j += 2
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case path.LineToCmp:
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pathAdder.adder.Add1(raster.Point{raster.Fix32(apath.Points[j] * 256), raster.Fix32(apath.Points[j+1] * 256)})
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j += 2
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case path.QuadCurveToCmp:
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pathAdder.adder.Add2(raster.Point{raster.Fix32(apath.Points[j] * 256), raster.Fix32(apath.Points[j+1] * 256)}, raster.Point{raster.Fix32(apath.Points[j+2] * 256), raster.Fix32(apath.Points[j+3] * 256)})
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j += 4
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case path.CubicCurveToCmp:
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pathAdder.adder.Add3(raster.Point{raster.Fix32(apath.Points[j] * 256), raster.Fix32(apath.Points[j+1] * 256)}, raster.Point{raster.Fix32(apath.Points[j+2] * 256), raster.Fix32(apath.Points[j+3] * 256)}, raster.Point{raster.Fix32(apath.Points[j+4] * 256), raster.Fix32(apath.Points[j+5] * 256)})
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j += 6
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case path.ArcToCmp:
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lastPoint := arcAdder(pathAdder.adder, apath.Points[j], apath.Points[j+1], apath.Points[j+2], apath.Points[j+3], apath.Points[j+4], apath.Points[j+5], pathAdder.ApproximationScale)
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pathAdder.adder.Add1(lastPoint)
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j += 6
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case path.CloseCmp:
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pathAdder.adder.Add1(pathAdder.firstPoint)
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}
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}
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}
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}
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