func renderMandelbrot() (err error) {
flag.Parse()
c := canvas.NewCanvas(width, height)
for x := 0; x < c.Bounds().Size().X; x++ {
for y := 0; y < c.Bounds().Size().Y; y++ {
c.Set(x, y, color.RGBA{0, 0, 0, 255})
}
}
switch colorScheme {
case "smooth":
f := fractal.Fractal{
Src: c.RGBA,
Iter: iterations,
Center: complex(centerReal, centerImag),
Zoom: zoom,
}
mandel.Smooth(&f)
case "random":
mandel.Draw(c.RGBA, zoom, complex(centerReal, centerImag), iterations, fractal.NewRandomGradient(iterations))
case "pretty":
mandel.Draw(c.RGBA, zoom, complex(centerReal, centerImag), iterations, fractal.NewPrettyGradient(iterations))
case "pedagogical":
mandel.Draw(c.RGBA, zoom, complex(centerReal, centerImag), iterations, fractal.PedagogicalGradient)
case "orbit":
// f, err := os.Open("z.png")
// if err != nil {
// return err
// }
// defer f.Close()
// src, err := png.Decode(f)
// if err != nil {
// return err
// }
// mandel.DrawOrbit(src, c.RGBA, zoom, complex(centerReal, centerImag), iterations)
case "julia":
// mandel.DrawJulia(src, c.RGBA, zoom, complex(centerReal, centerImag), iterations)
default:
log.Fatalln(errutil.Newf("undefined color scheme: %s", colorScheme))
}
err = c.Save(filename)
if err != nil {
return errutil.Err(err)
}
return nil
}
// loadResources loads the background and foreground images.
func loadResources() (err error) {
c := canvas.NewCanvas(width, height)
for x := 0; x < c.Bounds().Size().X; x++ {
for y := 0; y < c.Bounds().Size().Y; y++ {
c.Set(x, y, color.RGBA{0, 0, 0, 255})
}
}
f := fractal.Fractal{
Src: c.RGBA,
Iter: iterations,
Center: complex(centerReal, centerImag),
Zoom: zoom,
}
mandel.Smooth(&f)
// Load background image.
fractalImg, err = win.ReadImage(f.Src)
if err != nil {
return err
}
return nil
}