castRay
inline fun castRay(fromX: Int, fromY: Int, toX: Int, toY: Int, rayCanPass: (Int, Int) -> Boolean): Boolean
Cast a ray from a point to another point and checks if each point along the way can be passed via the rayCanPass parameter.
https://github.com/deepnight/deepnightLibs/blob/master/src/dn/Bresenham.hx