Javascript Collision Detection between circle and polygon?

You may consider splitting your pipe into triangles and then finding triangle - circle intersection area. If they do intersect the intersection will always be a convex polygon (area is easy to calculate by splitting into triangles again) and a segment (area is easy to calculate too - http://en.wikipedia.org/wiki/Circular_segment ). The other case is the triangle itself, in case it lies inside the circle completely (a simple case again).

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