func New(gradient *Gradient) *Fractal {
var f = new(Fractal)
f.width = 256
f.height = 256
f.gradient = gradient
f.Iterations = 12
f.Center = cx.New(0, 0)
f.Z0 = cx.New(0, 0)
f.Zoom = cx.New(3.5, 1.0)
f.Precision = 64
return f
}
//move vector in texcoords
func (f *Fractal) MoveCenter(v *Vec2) {
var c = cx.NewFromVec2(v)
var pointFive = cx.New(.5, .5)
defer c.Clear()
defer pointFive.Clear()
c.Subi(pointFive)
c.MuliComponents(f.Zoom)
f.Center.Addi(c)
}
func (f *Fractal) CreateTexture() *texture.Texture {
f.reloadPrecision()
var ratio = cx.NewFloat(f.Ratio())
f.Zoom.SetY(f.Zoom.X)
f.Zoom.MulY(ratio)
var halfToUpperRight = f.Zoom.MulsDouble(.5)
var lowerLeft = f.Center.Sub(halfToUpperRight)
var wh = cx.New(Double(f.width), Double(f.height))
var fxy = f.Zoom.DivComponents(wh)
var coord = lowerLeft.Copy()
defer func() {
ratio.Clear()
halfToUpperRight.Clear()
lowerLeft.Clear()
wh.Clear()
fxy.Clear()
coord.Clear()
}()
var sum Double = 0.0
var col *Color24 = NewColor24(0, 0, 0)
var intensity Double
Printf("Idle time: ")
util.Ts()
cx.SetIterations(f.Iterations)
for y := 0; y < f.height; y++ {
coord.SetX(lowerLeft.X)
coord.AddY(fxy.Y)
for x := 0; x < f.width; x++ {
coord.AddX(fxy.X)
intensity = Double(f.Z0.DoMandel(coord)) / Double(f.Iterations)
//intensity = intensity.Sqrt()
f.gradient.Interpolate(col, intensity)
f.grid.SetPixel24(x, y, col)
}
sum += intensity
}
Printf(">>>>>>>>>>>>>>>> Math time: ")
util.Ts()
f.renewTexture()
Printf("GL time: ")
util.Ts()
Println("Intensity sum:", sum, col)
return f.tex
}