rnentjes/kotlin-webgl-fractal
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Mandelbrot

Browse Source
This commit is contained in:
rnentjes
2016-05-22 11:10:52 +02:00
parent b9a2210d31
commit dbd486a4de
3 changed files with 64 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
src/MandelBrot.kt
View File

@@ -41,6 +41,25 @@ class HTMLElements {
canvas.setAttribute("style", "position: absolute; left: 0px; top: 0px; z-index: 5; width: ${windowWidth}px; height: ${windowHeight}px;" )
}
fun getColor(mu: Double) {
var clr1 = mu.toInt()
var t2 = mu - clr1
var t1 = 1 - t2
clr1 = clr1 % 768
// int clr1 = (int)mu;
// double t2 = mu - clr1;
// double t1 = 1 - t2;
// clr1 = clr1 % Colors.Count;
// int clr2 = (clr1 + 1) % Colors.Count;
//
// byte r = (byte)(Colors[clr1].R * t1 + Colors[clr2].R * t2);
// byte g = (byte)(Colors[clr1].G * t1 + Colors[clr2].G * t2);
// byte b = (byte)(Colors[clr1].B * t1 + Colors[clr2].B * t2);
//
// return Color.FromArgb(255, r, g, b);
}
fun drawMandel() {
/*
For each pixel (Px, Py) on the screen, do:
@@ -61,25 +80,28 @@ class HTMLElements {
plot(Px, Py, color)
}*/
var xs: Float
var ys: Float
var xx: Float
var yy: Float
var xt: Float
var xs: Double
var ys: Double
var xx: Double
var yy: Double
var xt: Double
var iteration: Int
var max_iteration: Int = 511
var halfWindowHeight = windowHeight / 2
val max_iteration: Int = 767
val halfWindowHeight = windowHeight / 2
var red: Int
var green: Int
var blue: Int
var fillStyle: String
var mu: Double
println("Window width: $windowWidth, height: $windowHeight, half: $halfWindowHeight")
for (x in 0..windowWidth) {
for (y in 0..halfWindowHeight) {
xs = (3.5f / windowWidth.toFloat()) * x - 2.5f
ys = 1f - ((1f / halfWindowHeight) * y)
xs = (4.0 / windowWidth.toFloat()) * x - 2.0
ys = 2.0 - ((2.0 / halfWindowHeight) * y)
xx = 0f
yy = 0f
xx = 0.0
yy = 0.0
iteration = 0
while(xx*xx + yy*yy < 4 && iteration < max_iteration) {
xt = xx*xx - yy*yy + xs
@@ -87,11 +109,18 @@ class HTMLElements {
xx = xt
iteration++
}
fillStyle = "rgb(${(iteration * 2) % 256}, ${(iteration * 3) % 256}, ${(iteration) % 256})"
if (iteration == max_iteration) {
fillStyle = "rgb(0, 0, 0)"
} else {
mu = iteration + 1 -
Math.log(Math.log(xx*xx + yy*yy)) / Math.log(2.0);
iteration = (iteration * 13) % 768
red = Math.min(iteration, 255)
green = Math.max(0, Math.min(iteration, 511) - 256)
blue = Math.max(0, Math.min(iteration, 767) - 512)
fillStyle = "rgb($red, $green, $blue)"
}
//red =
canvas2d.fillStyle = fillStyle
canvas2d.fillRect(x.toDouble(), y.toDouble(), 1.0, 1.0)
canvas2d.fillRect(x.toDouble(), windowHeight - y.toDouble(), 1.0, 1.0)