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Click to define the four control points. Then click the `Divide'
button and select the yellow dot where you wish to subdivide the
curve. Repeat this procedure to subdivide the curve as many times as
you like. Note how the control points become a good polyline
approximation to the curve after only a few subdivisions. Note also
how the curve is unchanged as you subdivide, although the larger
number of control points offers greater freedom for fine-tuning. Try
to fine-tune the curve by clicking and dragging control points, and
note the difficulty in maintaining a continuous first derivative.
Author: Department of Electronic Engineering and Computer Science,
Faculty of Engineering, Kinki University, Japan. | 