shapes.java

Java大学基础教程V6前五章源码

// Fig. 5.26: Shapes.java
// Demonstrates drawing different shapes.
import java.awt.Graphics;
import javax.swing.JPanel;

public class Shapes extends JPanel
{
   private int choice; // user's choice of which shape to draw
   
   // constructor sets the user's choice
   public Shapes( int userChoice )
   {
      choice = userChoice;
   } // end Shapes constructor
   
   // draws a cascade of shapes starting from the top left corner
   public void paintComponent( Graphics g )
   {
      super.paintComponent( g );
      
      for ( int i = 0; i < 10; i++ )
      {
         // pick the shape based on the user's choice
         switch ( choice )
         {
            case 1: // draw rectangles
               g.drawRect( 10 + i * 10, 10 + i * 10, 
                  50 + i * 10, 50 + i * 10 );
               break;
            case 2: // draw ovals
               g.drawOval( 10 + i * 10, 10 + i * 10, 
                  50 + i * 10, 50 + i * 10 );
               break;
         } // end switch
      } // end for
   } // end method paintComponent
} // end class Shapes


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