map square to circle code example

Example 1: map a square to a circle

function map(x, y) {
	return [
    	x * Math.sqrt(1 - y * y / 2),
        y * Math.sqrt(1 - x * x / 2)];
}

Example 2: map square to circle

function map(x, y) {
    return [
        x * Math.sqrt(1 - y * y / 2), 
        y * Math.sqrt(1 - x * x / 2)];
}