MaxInterview - checking a point is in polygon

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1function insidePoly(poly, pointx, pointy) {
2    var i, j;
3    var inside = false;
4    for (i = 0, j = poly.length - 1; i < poly.length; j = i++) {
5        if(((poly[i].y > pointy) != (poly[j].y > pointy)) && (pointx < (poly[j].x-poly[i].x) * (pointy-poly[i].y) / (poly[j].y-poly[i].y) + poly[i].x) ) inside = !inside;
6    }
7    return inside;
8}
9

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