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A curve is defined in terms of four points. There is a formula to determine the coordinates of all points on a spline in terms of these four points. The formula uses two parameterized cubic equations. These equations determine the x and y coordinates of a point on the curve. By finding the points corresponding to various parameters, it is possible to approximate the spline as closely as necessary. See below for the equations.</P>
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Splines may be created by drawing curves which