65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
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package patterns
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo/canvas"
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import "git.tebibyte.media/sashakoshka/tomo/artist"
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type Border struct {
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canvas.Canvas
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artist.Inset
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}
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func (pattern Border) Draw (destination canvas.Canvas, clip image.Rectangle) {
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bounds := clip.Canon().Intersect(destination.Bounds())
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if bounds.Empty() { return }
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srcSections := nonasect(pattern.Bounds(), pattern.Inset)
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srcTextures := [9]Texture { }
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for index, section := range srcSections {
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srcTextures[index] = Texture {
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Canvas: canvas.Cut(pattern, section),
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}
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}
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dstSections := nonasect(destination.Bounds(), pattern.Inset)
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for index, section := range dstSections {
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srcTextures[index].Draw(canvas.Cut(destination, section), clip)
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}
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}
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func nonasect (bounds image.Rectangle, inset artist.Inset) [9]image.Rectangle {
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center := inset.Apply(bounds)
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return [9]image.Rectangle {
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// top
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image.Rectangle {
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bounds.Min,
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center.Min },
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image.Rect (
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center.Min.X, bounds.Min.Y,
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center.Max.X, center.Min.Y),
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image.Rect (
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center.Max.X, bounds.Min.Y,
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bounds.Max.X, center.Min.Y),
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// center
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image.Rect (
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bounds.Min.X, center.Min.Y,
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center.Min.X, center.Max.Y),
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center,
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image.Rect (
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center.Max.X, center.Min.Y,
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bounds.Max.X, center.Max.Y),
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// bottom
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image.Rect (
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bounds.Min.X, center.Max.Y,
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center.Min.X, bounds.Max.Y),
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image.Rect (
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center.Min.X, center.Max.Y,
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center.Max.X, bounds.Max.Y),
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image.Rect (
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center.Max.X, center.Max.Y,
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bounds.Max.X, bounds.Max.Y),
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}
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}
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