91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
package artist
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
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// Paste transfers one canvas onto another, offset by the specified point.
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func Paste (
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destination tomo.Canvas,
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source tomo.Canvas,
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offset image.Point,
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) (
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updatedRegion image.Rectangle,
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) {
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dstData, dstStride := destination.Buffer()
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srcData, srcStride := source.Buffer()
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sourceBounds :=
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source.Bounds().Canon().
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Intersect(destination.Bounds().Sub(offset))
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if sourceBounds.Empty() { return }
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updatedRegion = sourceBounds.Add(offset)
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for y := sourceBounds.Min.Y; y < sourceBounds.Max.Y; y ++ {
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for x := sourceBounds.Min.X; x < sourceBounds.Max.X; x ++ {
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dstData[x + offset.X + (y + offset.Y) * dstStride] =
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srcData[x + y * srcStride]
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}}
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return
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}
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// FillRectangle draws a filled rectangle with the specified pattern.
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func FillRectangle (
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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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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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return
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}
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// StrokeRectangle draws the outline of a rectangle with the specified line
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// weight and pattern.
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func StrokeRectangle (
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destination tomo.Canvas,
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source Pattern,
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weight int,
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bounds image.Rectangle,
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) {
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bounds = bounds.Canon()
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insetBounds := bounds.Inset(weight)
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if insetBounds.Empty() {
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FillRectangle(destination, source, bounds)
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return
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}
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// top
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FillRectangle (destination, source, image.Rect (
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bounds.Min.X, bounds.Min.Y,
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bounds.Max.X, insetBounds.Min.Y))
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// bottom
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FillRectangle (destination, source, image.Rect (
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bounds.Min.X, insetBounds.Max.Y,
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bounds.Max.X, bounds.Max.Y))
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// left
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FillRectangle (destination, source, image.Rect (
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bounds.Min.X, insetBounds.Min.Y,
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insetBounds.Min.X, insetBounds.Max.Y))
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// right
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FillRectangle (destination, source, image.Rect (
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insetBounds.Max.X, insetBounds.Min.Y,
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bounds.Max.X, insetBounds.Max.Y))
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}
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