testPoint = (x, y, w, h, v) => {
// number of times to iterate
// through the test. a bounded
// point will end up with a value
// of 255, which causes the pixel
// representation to be fully black
let k = 0;
let maxIterations = 255;
// initilize the point x,y values
let p = {
x:0,
y:0
};
// scale the x and y coordinates from screen space
let c = {
x: v.x+x/v.s,
y: v.y+y/v.s
}
// keep iterating on the point until
// it hits the max iterations or the
// we determine it is unbounded
while ((k<maxIterations) && (p.x*p.x + p.y*p.y<4)) {
p = {
x: (p.x*p.x) - (p.y*p.y) + c.x,
y: 2 * p.x*p.y + c.y
};
++k;
}
return k;
}
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