driver.java

Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套 代码

import javax.swing.JFrame;
import java.awt.*;

/** Program to display a Sierpinski Gasket (Figure 14.23)
 *  Author: David Riley
 *  Date: January, 2005
 */
public class Driver  {
	private JFrame win;

	public Driver()   {
		win = new JFrame("Sierpinski Gasket");
		win.setBounds(10, 10, 600, 620);
		win.setVisible(true);
		win.setLayout(null);
		displayGaskets(300, 0, 600, 5);
		win.repaint();
	}
	
	/**	pre:	lev > 0    
	 *	post:	Sierpinski gaskets of level lev are drawn on win
	 *			within a triangle with upper apex at (x, y)
	 *			and height of h   
	 */
	private void displayGaskets( int x, int y, int h,  int lev )   {
		DownTriangle gasket;
		gasket = new DownTriangle(x, y, h);
		win.add(gasket, 0);
		if (lev > 1)   {
			displayGaskets(x, y, h/2, lev-1);
			displayGaskets(x-h/4, y+h/2, h/2, lev-1);
			displayGaskets(x+h/4, y+h/2, h/2, lev-1);
		}
	}
}