cardinal(pt1: Vec2, m1: Vec2, m2: Vec2, pt2: Vec2, tension: number): Vec2
A second order function returning an evaluator for the given 2D Cardinal curve.
parampt1- Previous point.
paramm1- First point.
paramm2- Second point.
parampt2- Next point.
paramtension- The tension of the curve, [0..1] from round to tight.
returnsA function which gives the value on the 2D Cardinal curve at t.
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