Total members 11632 |It is currently Sat Apr 29, 2017 10:22 pm Login / Join Codemiles

Java

C/C++

PHP

C#

HTML

CSS

ASP

Javascript

JQuery

AJAX

XSD

Python

Matlab

R Scripts

Weka





Move image in front of a background image, eliminates flashing by double buffering.
java code
/*
* Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
/*
* 1.0 code.
*/

import java.awt.*;
import java.applet.Applet;

/*
* This applet moves one image in front of a background image.
* It eliminates flashing by double buffering.
*/

public class MovingImage extends Applet implements Runnable {
int frameNumber = -1;
int delay;
Thread animatorThread;
boolean frozen = false;

Dimension offDimension;
Image offImage;
Graphics offGraphics;

Image stars;
Image rocket;

public void init() {
String str;
int fps = 10;

//How many milliseconds between frames?
str = getParameter("fps");
try {
if (str != null) {
fps = Integer.parseInt(str);
}
} catch (Exception e) {}
delay = (fps > 0) ? (1000 / fps) : 100;

//Get the images.
stars = getImage(getCodeBase(), "../images/starfield.gif");
rocket = getImage(getCodeBase(), "../images/rocketship.gif");
}

public void start() {
if (frozen) {
//Do nothing. The user has requested that we
//stop changing the image.
} else {
//Start animating!
if (animatorThread == null) {
animatorThread = new Thread(this);
}
animatorThread.start();
}
}

public void stop() {
//Stop the animating thread.
animatorThread = null;

//Get rid of the objects necessary for double buffering.
offGraphics = null;
offImage = null;
}

public boolean mouseDown(Event e, int x, int y) {
if (frozen) {
frozen = false;
start();
} else {
frozen = true;

//Instead of calling stop(), which destroys the
//backbuffer, just stop the animating thread.
animatorThread = null;
}
return true;
}

public void run() {
//Just to be nice, lower this thread's priority
//so it can't interfere with other processing going on.
Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

//Remember the starting time.
long startTime = System.currentTimeMillis();

//This is the animation loop.
while (Thread.currentThread() == animatorThread) {
//Advance the animation frame.
frameNumber++;

//Display it.
repaint();

//Delay depending on how far we are behind.
try {
startTime += delay;
Thread.sleep(Math.max(0,
startTime-System.currentTimeMillis()));
} catch (InterruptedException e) {
break;
}
}
}

public void paint(Graphics g) {
update(g);
}

public void update(Graphics g) {
Dimension d = size();

//Create the offscreen graphics context, if no good one exists.
if ( (offGraphics == null)
|| (d.width != offDimension.width)
|| (d.height != offDimension.height) ) {
offDimension = d;
offImage = createImage(d.width, d.height);
offGraphics = offImage.getGraphics();
}

//Erase the previous image.
offGraphics.setColor(getBackground());
offGraphics.fillRect(0, 0, d.width, d.height);
offGraphics.setColor(Color.black);

//Paint the frame into the image.
paintFrame(offGraphics);

//Paint the image onto the screen.
g.drawImage(offImage, 0, 0, this);
}

void paintFrame(Graphics g) {
Dimension d = size();
int w;
int h;

//If we have a valid width and height for the background image,
//draw it.
w = stars.getWidth(this);
h = stars.getHeight(this);
if ((w > 0) && (h > 0)) {
g.drawImage(stars, (d.width - w)/2,
(d.height - h)/2, this);
}

//If we have a valid width and height for the background image,
//draw it.
w = rocket.getWidth(this);
h = rocket.getHeight(this);
if ((w > 0) && (h > 0)) {
g.drawImage(rocket, ((frameNumber*5) % (w + d.width)) - w,
(d.height - h)/2, this);
}
}
}




Author:
Mastermind
User avatar Posts: 2707
Have thanks: 74 time
Post new topic Reply to topic  [ 1 post ] 

  Related Posts  to : Move image in front of a background image
 No repeated background image     -  
 Hide the background image by one click     -  
 Set position of background image in pixels     -  
 right bottom background image position     -  
 Repeat background image on x axis     -  
 Repeat background image on y axis     -  
 Table background image problem     -  
 Start background image from its bottom     -  
 background-image Anchor in header links     -  
 Automatic change to webpage background image     -  



Topic Tags

Java Graphics






Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
All copyrights reserved to codemiles.com 2007-2011
mileX v1.0 designed by codemiles team