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The class Rectangle
The class Rectangle represents the drawing primitive of a
parallelogram with optional rounded corners. When drawn interactively
the object is an axis aligned rectangle. After applying affine
transformations the rectangle may not be a rectangle anymore, but it
will remain a parallelogram. 
In Skencil, a rectangle is represented by the affine transformation
necessary to map the unit square (opposite corners (0, 0) and (1, 1)),
to the parallelogram. This is an elegant and convenient but also
somewhat unusual representation.
The transformation is of course stored as a devguide-7.htmltransformation object . 
The rounded corners are defined by two floating point numbers
radius1 and radius2. Both numbers define a radius of the
ellipses that make up the rounded corners of the unit square,
radius1 defines the horizontal radius and radius2 the
vertical radius. Valid values lie in the range 0.0 <= radius1,radius2
<= 0.5.
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