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<![CDATA[UNKNOWN
//**************************************
// Name: Double Buffer
// Description:Demonstates the use of off screen graphics for smoother animation.
// By: Dave Smith
//
//
// Inputs:None
//
// Returns:None
//
//Assumes:None
//
//Side Effects:None
//This code is copyrighted and has limited warranties.
//Please see http://www.Planet-Source-Code.com/xq/ASP/txtCodeId.1862/lngWId.2/qx/vb/scripts/ShowCode.htm
//for details.
//**************************************
import java.applet.Applet;
import java.awt.*;
import java.lang.*;
public class DoubleBuffer extends Applet implements Runnable{
private Image offScreenImage;
int holdX[];
int holdY[];
int holdRad[];
Thread thisThread = new Thread(this);
int intThrow = 0;
int intSpeed = 1;
public void init() {
setBackground(Color.black);
offScreenImage = createImage(getSize().width, getSize().height);
holdX = new int[200];
holdY = new int[200];
holdRad = new int[200];
for (int count=0;count<200;count++) {
holdX[count] = (int)(getSize().width*Math.random());
holdY[count] = (int)(getSize().height*Math.random());
holdRad[count] = (int)(4*Math.random());
}
repaint();
thisThread.start();
}
public void update(Graphics g) {
Graphics offScreenGraphics = offScreenImage.getGraphics();
offScreenGraphics.setColor(Color.black);
offScreenGraphics.fillRect(0,0,getSize().width, getSize().height);
offScreenGraphics.setColor(Color.white);
for (int count=0;count<200;count++) {
offScreenGraphics.fillRect(holdX[count], holdY[count], holdRad[count], holdRad[count]);
holdX[count] += holdRad[count]+intSpeed;
if (holdRad[count] <= 1) {
offScreenGraphics.setColor(Color.white);
} else {
offScreenGraphics.setColor(Color.white);
}
if (holdX[count]>=getSize().width) {
holdX[count] = 1;
}
if (holdX[count] < 0) {
holdX[count] = getSize().width;
}
}
paint(offScreenGraphics);
g.drawImage(offScreenImage,0,0,this);
}
public void run() {
do {
repaint();
try {
Thread.currentThread().sleep(15);
} catch (Exception sleepProblem) { // Slow the bugger down a bit.
System.out.println(sleepProblem);
}
} while (intThrow==0);
}
public boolean keyDown(Event event, int keyCode) {
if (event.shiftDown()) {
intSpeed+=1;
}
if (event.controlDown()) {
intSpeed-=1;
}
return true;
}
}
]]>