// MapImageTo maps one picture through an IFS onto another.
func (o Affine) MapImageTo(src *canvas.Canvas, dest *canvas.Canvas, k int, done chan int) {
for i := 0; i < src.Width; i++ {
x := float64(i) / src.FWidth
for j := 0; j < src.Height; j++ {
r, g, b := src.Get(i, j)
if r > 0 || g > 0 || b > 0 {
y := float64(j) / src.FHeight
x2, y2 := o.Apply(x, y)
dest.FSet(x2, y2, canvas.RGB(r, g, b))
}
}
}
done <- k
}
