I represent a collection of Points through which a cubic spline curve is fitted.

	displaying
	computeCurve displayOn:at:clippingBox:rule:fillColor: displayOn:transformation:clippingBox:rule:fillColor:

	private
	derivs:first:second:third:

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	coefficients Answer an eight-element Array of Arrays each of which is the length of the receiver. The first four arrays are the values, first, second and third derivatives, respectively, for the parametric spline in x. The last four elements are for y.

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	computeCurve Compute an array for the coefficients.
	displayOn:at:clippingBox:rule:fillColor: Display the receiver, a spline curve, approximated by straight line segments.
	displayOn:transformation:clippingBox:rule:fillColor: Get the scaled and translated path of newKnots.

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	derivs:first:second:third: Compute the first, second and third derivitives (in coefficients) from the Points in this Path (coefficients at: 1 and coefficients at: 5).

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	example Designate points on the Path by clicking the red button. Terminate by pressing any other button. A curve will be displayed, through the selected points, using a long black form.