35 lines
877 B
Go
35 lines
877 B
Go
package artist
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import "math"
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
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// FillEllipse draws a filled ellipse with the specified pattern.
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func FillEllipse (
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destination tomo.Canvas,
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source Pattern,
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bounds image.Rectangle,
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) (
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updatedRegion image.Rectangle,
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) {
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data, stride := destination.Buffer()
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realWidth, realHeight := bounds.Dx(), bounds.Dy()
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bounds = bounds.Canon().Intersect(destination.Bounds()).Canon()
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if bounds.Empty() { return }
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updatedRegion = bounds
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width, height := bounds.Dx(), bounds.Dy()
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for y := 0; y < height; y ++ {
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for x := 0; x < width; x ++ {
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xf := float64(x) / float64(width) - 0.5
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yf := float64(y) / float64(height) - 0.5
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if math.Sqrt(xf * xf + yf * yf) <= 0.5 {
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data[x + bounds.Min.X + (y + bounds.Min.Y) * stride] =
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source.AtWhen(x, y, realWidth, realHeight)
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}
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}}
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return
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}
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// TODO: StrokeEllipse
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