Java Examples in a Nutshell, 3rd Edition

Drawing and Filling Shapes

Example 12-6 lists a GraphicsExample implementation that shows how various Shape objects can be defined, drawn, and filled. The example produces the output shown in Figure 12-4. Although the Java 2D API allows basic shapes to be drawn and filled using the methods demonstrated in Example 12-1, this example uses a different approach. It defines each shape as a Shape object, using various classes, mostly from java.awt.geom.

Each Shape is drawn using the draw( ) method of the Graphics2D class and filled using the fill( ) method. Note that each Shape object is defined with one corner at (or near) the origin, rather than at the location where it is displayed on the screen. This creates position-independent objects that can easily be reused. To draw the shapes at particular locations, the example uses the translate( ) method of Graphics2D to move the origin of the coordinate system. Finally, the call to setStroke( ) specifies that drawing be done with a two-pixel-wide line, while the call to setRenderingHint( ) requests that drawing be done using antialiasing.

Figure 12-4. Drawing and filling shapes with the Java 2D API

Example 12-6. Shapes.java

package je3.graphics; import java.awt.*; import java.awt.geom.*; import java.awt.font.*; import java.awt.image.*; /** A demonstration of Java2D shapes */ public class Shapes implements GraphicsExample { static final ...