> (1)Does Java's Graphics provide some strategy for skewing (or perspective
> transformation)?
The 2D API supports only affine transformations which preserve the parallel
property of lines. It can be defined generally by a 2x3 matrix.
Perspective transforms can transform parallel lines into non-parallel
lines. A perspective transform requires a 3x3 matrix for a complete
definition.
> (2)Another question is that whether AffineTransform class can be used to
> realize "zoom in" and "zoom out" function? (Changing "1" in the matrix
> to other overall scalling).
The AffineTransform class has a scale method for performing just this
operation. The Graphics2D class has a utility method for scaling its
built-in transform also. See:
java.awt.geom.AffineTransform.scale(double scalex, double scaley);
java.awt.Graphics2D.scale(double scalex, double scaley);
in the class documentation.
...jim
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