func GenerateFractal(im *image.Gray) {
z := &cn{}
c := &cn{}
g := color.Gray{}
for x := 0; x < 1000; x++ {
for y := 0; y < 1000; y++ {
c.r = (*width * float64(x) / float64(1000)) - *width/float64(2)
c.i = (*height * float64(y) / float64(1000)) - *height/float64(2)
c.r += *centerx
c.i += *centery
z.r = 0
z.i = 0
zrsqr := z.r * z.r
zisqr := z.i * z.i
var i uint8 = 0
for zrsqr+zisqr < 4.0 && i < 255 {
i++
z.i = square(z.r+z.i) - zrsqr - zisqr
z.i += c.i
z.r = zrsqr - zisqr + c.r
zrsqr = square(z.r)
zisqr = square(z.i)
}
g.Y = i
im.SetGray(x, y, g)
}
}
}
func (entity *Entity) reproduce(other *Entity) *Entity {
newRects := make([]ShadedRectangle, len(entity.rects))
for i := 0; i < len(entity.rects); i++ {
if rand.Intn(2) == 0 {
newRects[i] = entity.rects[i]
} else {
newRects[i] = other.rects[i]
}
newRects[i].color.Y += uint8(2 * mutationFactor * (rand.Float64() - 0.5) * 256)
newRects[i].bounds.Min.X += int(2 * mutationFactor * (rand.Float64() - 0.5) * float64(entity.width))
newRects[i].bounds.Max.X += int(2 * mutationFactor * (rand.Float64() - 0.5) * float64(entity.width))
newRects[i].bounds.Min.Y += int(2 * mutationFactor * (rand.Float64() - 0.5) * float64(entity.height))
newRects[i].bounds.Max.Y += int(2 * mutationFactor * (rand.Float64() - 0.5) * float64(entity.height))
newRects[i].bounds.Min.X = clip(newRects[i].bounds.Min.X, 0, entity.width)
newRects[i].bounds.Max.X = clip(newRects[i].bounds.Max.X, 0, entity.width)
newRects[i].bounds.Min.Y = clip(newRects[i].bounds.Min.Y, 0, entity.height)
newRects[i].bounds.Max.Y = clip(newRects[i].bounds.Max.Y, 0, entity.height)
newRects[i].bounds = newRects[i].bounds.Canon()
/* enforce max size */
if newRects[i].bounds.Max.X-newRects[i].bounds.Min.X > rectMaxSize {
overage := newRects[i].bounds.Max.X - newRects[i].bounds.Min.X - rectMaxSize
newRects[i].bounds.Max.X -= overage / 2
newRects[i].bounds.Min.X += overage / 2
}
if newRects[i].bounds.Max.Y-newRects[i].bounds.Min.Y > rectMaxSize {
overage := newRects[i].bounds.Max.Y - newRects[i].bounds.Min.Y - rectMaxSize
newRects[i].bounds.Max.Y -= overage / 2
newRects[i].bounds.Min.Y += overage / 2
}
}
var newBgColor color.Gray
if rand.Intn(2) == 0 {
newBgColor = entity.bgColor
} else {
newBgColor = other.bgColor
}
newBgColor.Y += uint8(2 * mutationFactor * (rand.Float64() - 0.5) * 256)
return &Entity{entity.width, entity.height, newBgColor, newRects}
}
func (bilinear) Gray(src *image.Gray, x, y float64) color.Gray {
p := findLinearSrc(src.Bounds(), x, y)
// Array offsets for the surrounding pixels.
off00 := offGray(src, p.low.X, p.low.Y)
off01 := offGray(src, p.high.X, p.low.Y)
off10 := offGray(src, p.low.X, p.high.Y)
off11 := offGray(src, p.high.X, p.high.Y)
var fc float64
fc += float64(src.Pix[off00]) * p.frac00
fc += float64(src.Pix[off01]) * p.frac01
fc += float64(src.Pix[off10]) * p.frac10
fc += float64(src.Pix[off11]) * p.frac11
var c color.Gray
c.Y = uint8(fc + 0.5)
return c
}