Rational C^{2} Bezier Spline Applet
DIRECTIONS: In this applet, you create a rational
C2 Bezier spline by placing control points p_{i} = (x_{i},y_{i})
on the screen, which are stored as points in space as (1,x_{i},y_{i}).
The weights λ_{i} are initially set as 1, and are
modified by using the A and Z keys. The A key decreases the weight
and the Z key increases the weight. The algorithm for creating
the composite rational Bezier curve proceeds by constructing a
C1 Bezier spline in space with control points
(λ_{i},x_{i},y_{i}) and then perspectively
projecting this curve onto the plane (1,ξ,η).


