Java基础之在窗口中绘图——填充星型（StarApplet 2 filled stars）

Applet程序。

 import javax.swing.*;
 import java.awt.*;
 import java.awt.geom.GeneralPath;

 @SuppressWarnings("serial")
 public class StarApplet extends JApplet {
   // Initialize the applet
   @Override
   public void init() {
     StarPane pane = new StarPane();                                    // Pane containing stars
     getContentPane().add(pane);                                        // BorderLayout.CENTER is default position
   }

   // Class defining a pane on which to draw
   class StarPane extends JComponent {
     @Override
     public void paint(Graphics g) {
       Graphics2D g2D = (Graphics2D)g;
       float delta = 60;                                                // Increment between stars
       float starty = 0;                                                // Starting y position

       // Draw 3 rows of 4 stars
       GeneralPath star = null;
       for(int yCount = 0 ; yCount < 3 ; yCount++) {
         starty += delta;                                               // Increment row position
         float startx = 0;                                              // Start x position in a row

         // Draw a row of 4 stars
         for(int xCount = 0 ; xCount < 4 ; xCount++) {
           star = Star.starAt(startx += delta, starty);
           g2D.setPaint(Color.GREEN);                                   // Color for fill is green
           g2D.fill(star);                                              // Fill the star
           g2D.setPaint(Color.BLUE);                                    // Drawing color blue
           g2D.draw(star);
         }
       }
     }
   }
 }

其他与上一例同。
注意:在填充后才绘制边界是很重要的，否则填充就会覆盖边界。如果仅仅调用fill()方法，在填充形状后就不再绘制边界。