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Flicker Free Drawing

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Submitted on: 9/3/2003 2:18:45 PM
By: Jayant Mukherjee  
Level: Intermediate
User Rating: Unrated
Compatibility:Java (JDK 1.1), Java (JDK 1.2)

Users have accessed this article 1015 times.
 
(About the author)
 
     This Applet displays Flicker free drawing thru Double Buffering technique. This article is an excerpt from the Complete Reference of JAVA. Have Fun. If you vote for me that would be great for me but it not at all necessary.

This article has accompanying files
 
 
Terms of Agreement:   
By using this article, you agree to the following terms...   
1) You may use this article in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.   
2) You MAY NOT redistribute this article (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.   
3) You may link to this article from another website, but ONLY if it is not wrapped in a frame. 
4) You will abide by any additional copyright restrictions which the author may have placed in the article or article's description.
/* A simple Double Buffering example by Jayant Mukherjee (courtesy: Complete Reference) */
/* Another way of doing the same is described by Wayne McKenzie on PSC */
import java.awt.*;
import java.applet.*;
import java.awt.image.*;
import java.awt.event.*;
public class DblBuffr extends Applet implements MouseMotionListener
    {
    int ax,ay;
    Dimension dSize;
    Image dblBuffImg; //Off Screen
    Graphics dblBuffer; //Off Screen Graphics
    public void init()
        { 
        dSize = this.getSize();
        dblBuffImg = this.createImage(dSize.width, dSize.height);
        dblBuffer = dblBuffImg.getGraphics();
        addMouseMotionListener(this);
        this.setBackground(Color.yellow);
    }

public void mouseDragged(MouseEvent em){} //Not used, but required public void mouseMoved(MouseEvent em) { ax = em.getX(); ay = em.getY(); this.paint(this.getGraphics()); //Fast repainting }
public void update(){} //Overriding, for Flicker Free Drawing public void paint(Graphics g) { dblBuffer.clearRect(0, 0, dSize.width, dSize.height); for(int i=0; i<=dSize.width; i=i+10) { dblBuffer.drawLine(ax,ay,i,0); //Top edge dblBuffer.drawLine(ax,ay,i,dSize.height); //Bottom edge }
for(int i=0; i<=dSize.height; i=i+10) { dblBuffer.drawLine(ax,ay,0,i); //Left edge dblBuffer.drawLine(ax,ay,dSize.width,i); //Right edge }
g.drawImage(dblBuffImg, 0, 0, null); }
}

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Terms of Agreement:   
By using this article, you agree to the following terms...   
1) You may use this article in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.   
2) You MAY NOT redistribute this article (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.   
3) You may link to this article from another website, but ONLY if it is not wrapped in a frame. 
4) You will abide by any additional copyright restrictions which the author may have placed in the article or article's description.


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