106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
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package artist
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import "image"
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import "image/color"
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import "git.tebibyte.media/sashakoshka/tomo"
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// Paste transfers one image 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.Image,
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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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sourceBounds := source.Bounds().Canon()
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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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destination.SetRGBA (
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x + offset.X, y + offset.Y,
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source.RGBAAt(x, y))
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}}
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return
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}
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// Rectangle draws a rectangle with an inset border. If the border image is nil,
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// no border will be drawn. Likewise, if the fill image is nil, the rectangle
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// will have no fill.
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func Rectangle (
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destination tomo.Canvas,
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fill tomo.Image,
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stroke tomo.Image,
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weight int,
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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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bounds = bounds.Canon()
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updatedRegion = bounds
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fillBounds := bounds
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fillBounds.Min = fillBounds.Min.Add(image.Point { weight, weight })
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fillBounds.Max = fillBounds.Max.Sub(image.Point { weight, weight })
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fillBounds = fillBounds.Canon()
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for y := bounds.Min.Y; y < bounds.Max.Y; y ++ {
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for x := bounds.Min.X; x < bounds.Max.X; x ++ {
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var pixel color.RGBA
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if (image.Point { x, y }).In(fillBounds) {
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pixel = fill.RGBAAt(x, y)
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} else {
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pixel = stroke.RGBAAt(x, y)
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}
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destination.SetRGBA(x, y, pixel)
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}}
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return
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}
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// OffsetRectangle is the same as Rectangle, but offsets the border image to the
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// top left corner of the border and the fill image to the top left corner of
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// the fill.
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func OffsetRectangle (
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destination tomo.Canvas,
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fill tomo.Image,
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stroke tomo.Image,
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weight int,
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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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bounds = bounds.Canon()
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updatedRegion = bounds
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fillBounds := bounds
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fillBounds.Min = fillBounds.Min.Add(image.Point { weight, weight })
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fillBounds.Max = fillBounds.Max.Sub(image.Point { weight, weight })
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fillBounds = fillBounds.Canon()
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strokeImageMin := stroke.Bounds().Min
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fillImageMin := fill.Bounds().Min
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yy := 0
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for y := bounds.Min.Y; y < bounds.Max.Y; y ++ {
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xx := 0
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for x := bounds.Min.X; x < bounds.Max.X; x ++ {
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var pixel color.RGBA
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if (image.Point { x, y }).In(fillBounds) {
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pixel = fill.RGBAAt (
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xx - weight + fillImageMin.X,
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yy - weight + fillImageMin.Y)
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} else {
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pixel = stroke.RGBAAt (
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xx + strokeImageMin.X,
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yy + strokeImageMin.Y)
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}
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destination.SetRGBA(x, y, pixel)
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xx ++
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}
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yy ++
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}
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return
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}
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