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tomo-old/artist/shapes/rectangle.go

122 lines
3.4 KiB
Go

package shapes
import "image"
import "image/color"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/shatter"
// TODO: return updatedRegion for all routines in this package
// FillRectangle draws the content of one canvas onto another. The offset point
// defines where the origin point of the source canvas is positioned in relation
// to the origin point of the destination canvas. To prevent the entire source
// canvas from being drawn, it must be cut with canvas.Cut().
func FillRectangle (
destination canvas.Canvas,
source canvas.Canvas,
offset image.Point,
) (
updatedRegion image.Rectangle,
) {
dstData, dstStride := destination.Buffer()
srcData, srcStride := source.Buffer()
sourceBounds :=
source.Bounds().Canon().
Intersect(destination.Bounds().Sub(offset))
if sourceBounds.Empty() { return }
updatedRegion = sourceBounds.Add(offset)
for y := sourceBounds.Min.Y; y < sourceBounds.Max.Y; y ++ {
for x := sourceBounds.Min.X; x < sourceBounds.Max.X; x ++ {
dstData[x + offset.X + (y + offset.Y) * dstStride] =
srcData[x + y * srcStride]
}}
return
}
// StrokeRectangle is similar to FillRectangle, but it draws an inset outline of
// the source canvas onto the destination canvas. To prevent the entire source
// canvas's bounds from being used, it must be cut with canvas.Cut().
func StrokeRectangle (
destination canvas.Canvas,
source canvas.Canvas,
offset image.Point,
weight int,
) {
bounds := source.Bounds()
insetBounds := bounds.Inset(weight)
if insetBounds.Empty() {
FillRectangle(destination, source, offset)
return
}
FillRectangleShatter(destination, source, offset, insetBounds)
}
// FillRectangleShatter is like FillRectangle, but it does not draw in areas
// specified in "rocks".
func FillRectangleShatter (
destination canvas.Canvas,
source canvas.Canvas,
offset image.Point,
rocks ...image.Rectangle,
) {
tiles := shatter.Shatter(source.Bounds().Sub(offset), rocks...)
for _, tile := range tiles {
FillRectangle(destination, canvas.Cut(source, tile), offset)
}
}
// FillColorRectangle fills a rectangle within the destination canvas with a
// solid color.
func FillColorRectangle (
destination canvas.Canvas,
color color.RGBA,
bounds image.Rectangle,
) (
updatedRegion image.Rectangle,
) {
dstData, dstStride := destination.Buffer()
bounds = bounds.Canon().Intersect(destination.Bounds())
if bounds.Empty() { return }
updatedRegion = bounds
for y := bounds.Min.Y; y < bounds.Max.Y; y ++ {
for x := bounds.Min.X; x < bounds.Max.X; x ++ {
dstData[x + y * dstStride] = color
}}
return
}
// FillColorRectangleShatter is like FillColorRectangle, but it does not draw in
// areas specified in "rocks".
func FillColorRectangleShatter (
destination canvas.Canvas,
color color.RGBA,
bounds image.Rectangle,
rocks ...image.Rectangle,
) {
tiles := shatter.Shatter(bounds, rocks...)
for _, tile := range tiles {
FillColorRectangle(destination, color, tile)
}
}
// StrokeColorRectangle is similar to FillColorRectangle, but it draws an inset
// outline of the given rectangle instead.
func StrokeColorRectangle (
destination canvas.Canvas,
color color.RGBA,
bounds image.Rectangle,
weight int,
) {
insetBounds := bounds.Inset(weight)
if insetBounds.Empty() {
FillColorRectangle(destination, color, bounds)
return
}
FillColorRectangleShatter(destination, color, bounds, insetBounds)
}