java开发实战1200（II）-----------079雪花飘落动画

package Test;

import java.awt.BorderLayout; import java.awt.Cursor; import java.awt.Image; import java.awt.Point; import java.awt.Toolkit; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent;

import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.SwingUtilities;

public class MainFrame extends JFrame { private BackgroundPanel backgroundPanel=null; public static void main(String args[]){ SwingUtilities.invokeLater(new Runnable(){ public void run(){ MainFrame frame=new MainFrame(); frame.setVisible(true); } }); } public MainFrame(){ super(); setTitle("雪花飘落动画"); setSize(628,411); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Image image=new ImageIcon(getClass().getResource("/image/cursor.png")).getImage(); Cursor cursor=getToolkit().createCustomCursor(image, new Point(), "魔棒"); setCursor(cursor); setResizable(false); backgroundPanel=new BackgroundPanel(); backgroundPanel.setImage(new ImageIcon(getClass().getResource("/image/bg.jpg")).getImage()); backgroundPanel.addMouseMotionListener(new MouseAdapter(){ public void mouseMoved(MouseEvent e){ SnowFlakeLabel snow=new SnowFlakeLabel(); Point point=e.getPoint(); snow.setLocation(point); backgroundPanel.add(snow); } }); getContentPane().setLayout(new BorderLayout()); getContentPane().add(backgroundPanel,BorderLayout.CENTER); }

}

package Test;

import java.awt.Container; import java.awt.Dimension; import java.awt.Point;

import javax.swing.ImageIcon; import javax.swing.JLabel;

public class SnowFlakeLabel extends JLabel implements Runnable { private final static ImageIcon snow=new ImageIcon(SnowFlakeLabel.class.getResource("/image/snowflake.png")); private int width=snow.getIconWidth(); private int height=snow.getIconHeight(); public SnowFlakeLabel(){ setSize(new Dimension(width,height)); setIcon(snow); new Thread(this).start(); } @Override public void run() { // TODO Auto-generated method stub Container parent=getParent(); Point myPoint=getLocation(); while(true){ if(parent==null){ try { Thread.sleep(50); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } myPoint=getLocation(); parent=getParent(); }else{ break; } } int sx=myPoint.x; int sy=myPoint.y; int stime=(int)(Math.random()*30+10); int parentHeight=parent.getHeight(); while(parent.isVisible()&&sy<parent.getHeight()-height){ setLocation(sx,sy); try { Thread.sleep(stime); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } sy+=2; } }

}