Transforms
The AffineTransform
class can transform a shape (or coordinate system) by translating,
scaling, rotating, or shearing it, using any combination of these
individual transformation types. Figure 12-5 illustrates the
results of various types of coordinate-system transformations on the
appearance of one shape, drawn multiple times. Example 12-7 shows the Java code
that generates the figure.
Figure 12-5. Transformed shapes
An affine transformation is a linear
transformation that has two important properties: all straight lines
remain straight, and all parallel lines remain parallel. The AffineTransform class can perform a great
variety of transformations, but it can’t produce nonlinear effects,
such as distorting a figure as through a fisheye lens. That kind of
effect can be achieved only with image-processing techniques. For a
further discussion of transformations and the linear algebra behind
the AffineTransform class, see
Chapter 4 of Java
Foundation Classes in a Nutshell.
Example 12-7. Transforms.java
package je3.graphics; import java.awt.*; import java.awt.geom.*; /** A demonstration of Java2D transformations */ public class Transforms implements GraphicsExample { public String getName( ) { return "Transforms"; } // From GraphicsExample public int getWidth( ) { return 750; } // From GraphicsExample public int getHeight( ) { return 250; } // From GraphicsExample Shape shape; ...Get Java Examples in a Nutshell, 3rd Edition now with the O’Reilly learning platform.
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