63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// Copyright 2010 The draw2d Authors. All rights reserved.
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// created: 06/12/2010 by Laurent Le Goff
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package path
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import (
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"github.com/llgcode/draw2d/curve"
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)
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type PathConverter struct {
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converter LineBuilder
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ApproximationScale float64
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}
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func NewPathConverter(converter LineBuilder) *PathConverter {
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return &PathConverter{converter, 1, 0, 0, 0, 0}
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}
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// may not been in path instead put it in a troke package thing
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func (c *PathConverter) Interpret(liner LineBuilder, scale float64, paths ...*Path) {
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// First Point
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var startX, startY float64 = 0, 0
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// Current Point
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var x, y float64 = 0, 0
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for _, path := range paths {
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i := 0
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for _, cmd := range path.Components {
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switch cmd {
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case MoveToCmp:
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x, y = path.Points[i], path.Points[i+1]
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startX, startY = x, y
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if i != 0 {
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liner.End()
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}
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liner.MoveTo(x, y)
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i += 2
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case LineToCmp:
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x, y = path.Points[i], path.Points[i+1]
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liner.LineTo(x, y)
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liner.LineJoin()
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i += 2
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case QuadCurveToCmp:
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curve.TraceQuad(liner, path.Points[i-2:], 0.5)
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x, y = path.Points[i+2], path.Points[i+3]
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liner.LineTo(x, y)
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i += 4
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case CubicCurveToCmp:
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curve.TraceCubic(liner, path.Points[i-2:], 0.5)
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x, y = path.Points[i+4], path.Points[i+5]
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liner.LineTo(x, y)
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i += 6
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case ArcToCmp:
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x, y = arc(liner, path.Points[i], path.Points[i+1], path.Points[i+2], path.Points[i+3], path.Points[i+4], path.Points[i+5], scale)
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liner.LineTo(x, y)
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i += 6
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case CloseCmp:
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liner.LineTo(startX, startY)
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liner.Close()
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}
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}
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liner.End()
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}
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}
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