beautifulmist.java

时间控制 模拟星空演示程序

/**程序线程通过使用Timer类控制动画
 *Timer类是通过固定频率调用actionPerformed方法
 *注意：如果你的编译器是j2sdk1.5.0版本，没有这样的效果
 *只能使用j2sdk1.4.x版本。
 */
import java.awt.Graphics;
import java.awt.Color;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.Timer;
import java.awt.Dimension;
import java.awt.event.*;

public class BeautifulMist extends JFrame  implements ActionListener
{
  protected static Color color = null;
  protected static Dimension dimension = null;
  protected static int location_x = 0;
  protected static int location_y = 0;
  protected static int red = 0;
  protected static int green = 0;
  protected static int blue = 0;
   
  protected Timer timer = null;
  // 构造方法
  public BeautifulMist()
  {  	
    getContentPane().add(new RectPanel());
    
    // 创建一个Timer对象，该对象以1毫秒的频率调用actionPerformed方法
    timer = new Timer(1,this);
  	timer.start();
  }

  public void actionPerformed(ActionEvent e)
  {
  	repaint();
  }

  // Main 方法
  public static void main(String[] args)
  {
    JFrame.setDefaultLookAndFeelDecorated(true);
    BeautifulMist frame = new BeautifulMist();
    frame.setTitle("星空晚霞");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400,400);
    frame.setVisible(true);
  }
  
    //面板类
	class RectPanel extends JPanel    
	{			
   		public void paintComponent(Graphics g)
   		{ 		
     		// 使用随机数产生点的坐标
     		dimension = getSize();	
     		location_x = (int) (Math.random() * dimension.width);
     		location_y = (int) (Math.random() * dimension.height);	

     		// 在面板的底部颜色最红
     		red = (int) (location_y * 255 / dimension.height);
     		// 在面板的右上角颜色最蓝
     		blue = (int) (((dimension.height - location_y) * 255 / dimension.height + location_x *255 / dimension.width) / 2);
    		// 在面板的左上角颜色最绿
    		green = (int) (((dimension.height - location_y) * 255 / dimension.height + (dimension.width - location_x) * 255 / dimension.width) / 2);
    		// 设置颜色
    		g.setColor(new Color(red, green, blue));
    		
    		// 画点		
     		g.drawLine(location_x,location_y,location_x,location_y);

   		}
	}
}