Alexander-0x80

function distance(p1, p2) {
    // Find the distance between two points
    return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2));
};

function intersect(c1, r1, c2, r2) {
    // Find the points of intersection for two circles
    // Based on: http://stackoverflow.com/a/3349134
    var d = distance(c1, c2);
    if (d > r1 + r2) // Circles do not overlap