A point on a path, expressed as an array of three coordinate arrays: the anchor point, left direction point, and right direction point. For paths that are straight segments (not curved), the coordinates of all three points are the same. For curved segments, the coordinates are different. The difference between the anchor point and the left or right direction points determines the arc of the curve. You use the left direction point to bend the curve "outward" or make it convex; you use the right direction point to bend the curve "inward" or make it concave.
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