detect if two line segments intersect each other javascript
function isIntersecting(p1, p2, p3, p4) {
function CCW(p1, p2, p3) {
return (p3.y - p1.y) * (p2.x - p1.x) > (p2.y - p1.y) * (p3.x - p1.x);
}
return (CCW(p1, p3, p4) != CCW(p2, p3, p4)) && (CCW(p1, p2, p3) != CCW(p1, p2, p4));
}
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