76 lines
2.4 KiB
Go
76 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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"freetype-go.googlecode.com/hg/freetype/raster"
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)
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type VertexAdder struct {
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command VertexCommand
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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{VertexNoCommand, adder}
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}
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func (vertexAdder *VertexAdder) NextCommand(cmd VertexCommand) {
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vertexAdder.command = cmd
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}
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func (vertexAdder *VertexAdder) Vertex(x, y float64) {
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switch vertexAdder.command {
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case VertexStartCommand:
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vertexAdder.adder.Start(raster.Point{raster.Fix32(x * 256), raster.Fix32(y * 256)})
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default:
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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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vertexAdder.command = VertexNoCommand
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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 ...*PathStorage) {
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for _, path := range paths {
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j := 0
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for _, cmd := range path.commands {
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switch cmd {
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case MoveTo:
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pathAdder.firstPoint = raster.Point{raster.Fix32(path.vertices[j] * 256), raster.Fix32(path.vertices[j+1] * 256)}
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pathAdder.adder.Start(pathAdder.firstPoint)
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j += 2
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case LineTo:
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pathAdder.adder.Add1(raster.Point{raster.Fix32(path.vertices[j] * 256), raster.Fix32(path.vertices[j+1] * 256)})
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j += 2
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case QuadCurveTo:
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pathAdder.adder.Add2(raster.Point{raster.Fix32(path.vertices[j] * 256), raster.Fix32(path.vertices[j+1] * 256)}, raster.Point{raster.Fix32(path.vertices[j+2] * 256), raster.Fix32(path.vertices[j+3] * 256)})
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j += 4
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case CubicCurveTo:
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pathAdder.adder.Add3(raster.Point{raster.Fix32(path.vertices[j] * 256), raster.Fix32(path.vertices[j+1] * 256)}, raster.Point{raster.Fix32(path.vertices[j+2] * 256), raster.Fix32(path.vertices[j+3] * 256)}, raster.Point{raster.Fix32(path.vertices[j+4] * 256), raster.Fix32(path.vertices[j+5] * 256)})
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j += 6
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case ArcTo:
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lastPoint := arcAdder(pathAdder.adder, path.vertices[j], path.vertices[j+1], path.vertices[j+2], path.vertices[j+3], path.vertices[j+4], path.vertices[j+5], pathAdder.ApproximationScale)
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pathAdder.adder.Add1(lastPoint)
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j += 6
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case Close:
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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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