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mandelbrot.html
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<body></body>
<script>
var c = document.createElement('canvas')
c.width = 360
c.height = 360
c.style.border = '1px solid black'
var g = c.getContext('2d')
function are_we_in_the_mandelbrot_set(x, y) {
var z = [0, 0]
var c = [x, y]
for (var i = 0; i < 255; i++) {
var z2 = [
z[0]*z[0] - z[1]*z[1],
z[0]*z[1] + z[1]*z[0]
]
z = [
z2[0] + c[0],
z2[1] + c[1]
]
if (z[0]*z[0] + z[1]*z[1] > 4) {
return i
}
}
return -1
}
var image_data = g.createImageData(360, 360)
for (var y = 0; y < 360; y++) {
for (var x = 0; x < 360; x++) {
var i = y * (360 * 4) + x * 4
var xx = (x / 360) * 4 - 2
var yy = (y / 360) * 4 - 2
var a = are_we_in_the_mandelbrot_set(xx, yy)
if (a == -1) {
image_data.data[i + 0] = 0
image_data.data[i + 1] = 0
image_data.data[i + 2] = 0
image_data.data[i + 3] = 255
} else {
image_data.data[i + 0] = 0
image_data.data[i + 1] = a
image_data.data[i + 2] = 0
image_data.data[i + 3] = 255
}
}
}
g.putImageData(image_data, 0, 0)
document.body.append(c)
console.log('hi!?')
</script>