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Author: ctomni231 (posted 2014-05-27 00:33:08, viewed 71 times)

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class SnowExample extends JComponent implements Runnable{

   private JFrame window;
   private BufferedImage bimg;
   
   public static void main(String args[]){
      SnowExample cool = new SnowExample();
      cool.showWindow();
   }
   
   /** How often the snow is produced */
   public final int FREQUENCY = 500;
   /** The maximum amount of particles allowed */
   public final int MAX_PARTICLE = 100;
   
   /** The random number generator */
   public Random rand;
   /** The type of snow ball to draw */
   public int[] type;
   /** The x-axis position of the snow ball */
   public double[] posx;
   /** The y-axis position of the snow ball */
   public double[] posy;
   /** The flash of the snow ball */
   public boolean[] flash;
   /** Temporary variable */
   public int temp;
   
   public void init(){
      type = new int[MAX_PARTICLE];
      posx = new double[MAX_PARTICLE];
      posy = new double[MAX_PARTICLE];
      flash = new boolean[MAX_PARTICLE];
      rand = new Random();
      for(int i = 0; i < MAX_PARTICLE; i++)
         type[i] = -1;
   }
   
   public void updateRender(Graphics2D g, int w, int h){
      
      //Create new snow particles
      for(int i = 0; i < MAX_PARTICLE; i++){
         if(type[i] == -1 && rand.nextInt(FREQUENCY) == 0){
            type[i] = rand.nextInt(3);
            posx[i] = (rand.nextInt((w+100)/10)*10) - 100;
            posy[i] = -10;
            flash[i] = rand.nextBoolean();
            break;
         }
      }
      
      //Snow particle updates
      for(int i = 0; i < MAX_PARTICLE; i++){
         if(type[i] == -1)
            continue;
         
         if(type[i] == 2){
            posx[i] += 0.5;
         }
         posx[i] += 0.5;
         posy[i] += 2;
         flash[i] = !flash[i];
         
         //Destroy particles
         if(posy[i] > h)
            type[i] = -1;
      }
      
      //Render particles
      g.setColor(Color.WHITE);
      for(int i = 0; i < MAX_PARTICLE; i++){
         if(type[i] == -1)
            continue;
         if(type[i] == 0 && flash[i])
            g.fillOval((int)posx[i], (int)posy[i], 4, 4);
         else if(type[i] == 1 && flash[i])
            g.fillOval((int)posx[i], (int)posy[i], 6, 6);
         else if(type[i] == 2 && flash[i])
            g.fillOval((int)posx[i], (int)posy[i], 8, 8);
      }
   }
   
   /////////////////////////////////////
   //The infrastructure stuff under here...
   /////////////////////////////////////
   
   public SnowExample(){
       window = new JFrame("Basic Screen");
        window.setBackground(Color.BLACK);
        setBackground(Color.BLACK);
        init();
   }
   
   public void showWindow(){
       Thread looper = new Thread(this);
         looper.start();
       window.add(this, BorderLayout.CENTER);
       window.addWindowListener(new WindowAdapter() {
             @Override
              public void windowClosing(WindowEvent e) {
                  window.dispose();
                  System.exit(0);
              }
          });
        window.validate();
        window.setVisible(true);
        window.pack();
   }
   
   @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        createGraphics2D((Graphics2D)g, getSize().width, getSize().height);
        //Draws a non-flickering image
        g.drawImage(bimg, 0, 0, this);
    }
   
   private void createGraphics2D(Graphics2D g2, int w, int h) {
        if (bimg == null || bimg.getWidth() != w || bimg.getHeight() != h)
            bimg = (BufferedImage) createImage(w, h);

        g2 = bimg.createGraphics();
        g2.setColor(Color.BLACK);
        g2.fillRect(0, 0, w, h);
        
        updateRender(g2, w, h);
    }
   
   @Override
    public Dimension getPreferredSize(){
        return new Dimension(400, 300);
    }
   
   @Override
   public final void run() {
        try{           
            while(true){
                Thread.sleep(10);
                repaint();
            }
        }catch(Exception e){
            System.err.println(e.getMessage());
            System.exit(0);
        }
    }
}





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