Spine.SkeletonBounds.IntersectsSegment C# (CSharp) Method

		public bool IntersectsSegment (Polygon polygon, float x1, float y1, float x2, float y2) {
			float[] vertices = polygon.Vertices;
			int nn = polygon.Count;

			float width12 = x1 - x2, height12 = y1 - y2;
			float det1 = x1 * y2 - y1 * x2;
			float x3 = vertices[nn - 2], y3 = vertices[nn - 1];
			for (int ii = 0; ii < nn; ii += 2) {
				float x4 = vertices[ii], y4 = vertices[ii + 1];
				float det2 = x3 * y4 - y3 * x4;
				float width34 = x3 - x4, height34 = y3 - y4;
				float det3 = width12 * height34 - height12 * width34;
				float x = (det1 * width34 - width12 * det2) / det3;
				if (((x >= x3 && x <= x4) || (x >= x4 && x <= x3)) && ((x >= x1 && x <= x2) || (x >= x2 && x <= x1))) {
					float y = (det1 * height34 - height12 * det2) / det3;
					if (((y >= y3 && y <= y4) || (y >= y4 && y <= y3)) && ((y >= y1 && y <= y2) || (y >= y2 && y <= y1))) return true;
				}
				x3 = x4;
				y3 = y4;
			}
			return false;
		}