Re: Need some help with animation
From: Rhino (rhino1_at_NOSPAM.sympatico.ca)
Date: 11/26/03
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Date: Wed, 26 Nov 2003 08:51:09 -0500
"ak" <k.andrei@gmx.de.spam> wrote in message news:bq2364$12j$1@online.de...
> You have some mistakes here.
>
> a) you load only FIRST frame from your GIF, try to use ImageIO to get all
of
> them
Not really. You are right that I am loading only only file but that file is
an animated GIF (GIF89a) so it contains all the frames.
> b) use MemoryImageSource to create animation. See javadoc for details.
>
I'll have a look at this.
Thanks!
Rhino
>
>
> "Rhino" <rhino1@NOSPAM.sympatico.ca> schrieb im Newsbeitrag
> news:0iQwb.12685$dt2.786959@news20.bellglobal.com...
> > I need some help with animation.
> >
> > Specifically, I am trying to create a class that will play an animated
GIF
> > (GIF89a) in a JPanel and stop or start when the user clicks the mouse.
> This
> > seems like something that should be pretty straight forward but I've
> already
> > put several hours into this without getting the results I want.
> >
> > My class *almost* works satisfactorily. The animation starts and stops
> when
> > I click (actually, I do two clicks to start it the very first time,
after
> > that the mouse toggles the animation with each click.) Unfortunately,
the
> > animation also disappears whenever it is not running. That's the part I
> need
> > help with.
> >
> > I would like the animated GIF to be visible and initially stopped on the
> > first frame when it is started the first time, then start when I've
> clicked
> > the mouse (twice if it's the very first time since the panel was
> > instantiated). The animation should stop but leave its current frame
> visible
> > when I click the mouse again, then restart from where it left off on the
> > next click.
> >
> > I've tried everything I can think of and researched the issue as
> thoroughly
> > as I could in Usenet but I can't find an example that does this or any
> > discussion of the relevant principles so that I can figure it out for
> > myself.
> >
> > Here is my code with most of the comments removed so that the post is
not
> > overly long. Please feel free to tell me to do things differently.
> > Personally, I find the logic in the paintComponent() method a little
> > odd-looking but I can't think of anything else to try there that hasn't
> > already failed to work.
> >
> > package racer;
> >
> > import java.awt.BorderLayout;
> >
> > import java.awt.Dimension;
> >
> > import java.awt.Graphics;
> >
> > import java.awt.Image;
> >
> > import java.awt.MediaTracker;
> >
> > import java.awt.Toolkit;
> >
> > import java.awt.event.MouseAdapter;
> >
> > import java.awt.event.MouseEvent;
> >
> > import java.io.File;
> >
> > import java.net.URL;
> >
> > import javax.swing.JFrame;
> >
> > import javax.swing.JPanel;
> >
> > public class AnimationPanel extends JPanel implements Runnable {
> >
> > final String CLASS_NAME = getClass().getName();
> >
> > static final boolean DEBUG = false;
> >
> > Thread animationThread = null;
> >
> > boolean keepDrawing;
> >
> > boolean frozen = false;
> >
> > Image animation = null;
> >
> > MediaTracker tracker = null;
> >
> > int stillWidth = 0;
> >
> > int stillHeight = 0;
> >
> >
> >
> >
> >
> > public static void main(String[] args) {
> >
> >
> > JFrame myFrame = new JFrame("Drawing Panel");
> >
> > myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
> >
> > AnimationPanel drawingPanel = new
AnimationPanel("racer/AnimatedGIFs",
> > "catwalk.gif", true);
> >
> > myFrame.getContentPane().add(drawingPanel, BorderLayout.CENTER);
> >
> > myFrame.pack();
> >
> > myFrame.setVisible(true);
> >
> > }
> >
> >
> >
> >
> > public AnimationPanel(String animationImageFilePath, String
> > animationImageFile, boolean controlWithMouse) {
> >
> >
> > super();
> >
> >
> > /* Get the URL for the animated image file. */
> >
> > URL animationGIF =
> > this.getClass().getClassLoader().getResource(animationImageFilePath +
> > File.separator + animationImageFile);
> >
> > /* Get the actual image file. */
> >
> > animation = Toolkit.getDefaultToolkit().getImage(animationGIF);
> >
> > try {
> >
> > tracker = new MediaTracker(this);
> >
> > tracker.addImage(animation, 0);
> >
> > tracker.waitForAll();
> >
> > }
> >
> > catch (Exception excp) {
> >
> > excp.printStackTrace();
> >
> > }
> >
> >
> > /* Assuming that all of the stills in the animation are the same size,
> > determine the
> >
> > height and width of the panel that will be needed to display them. */
> >
> > stillWidth = animation.getWidth(this);
> >
> > stillHeight = animation.getHeight(this);
> >
> > /* If the user wishes to control the animation with the mouse, activate
> this
> > listener. */
> >
> > if (controlWithMouse) {
> >
> > addMouseListener(new MouseAdapter() {
> >
> > public void mousePressed(MouseEvent evt) {
> >
> > if (frozen) {
> >
> > frozen = false;
> >
> > startAnimation();
> >
> > }
> >
> > else {
> >
> > frozen = true;
> >
> > stopAnimation();
> >
> > }
> >
> > }
> >
> > });
> >
> > } //end if
> >
> >
> > } //end AnimationPanel()
> >
> >
> >
> > public void startAnimation() {
> >
> >
> > if (animationThread == null) {
> >
> > animationThread = new Thread(this);
> >
> > keepDrawing = true;
> >
> > animationThread.start();
> >
> > }
> >
> > } //end startAnim()
> >
> >
> >
> > public void stopAnimation() {
> >
> >
> > if (animationThread != null) {
> >
> > keepDrawing = false;
> >
> > animationThread = null;
> >
> > }
> >
> > } //end stopAnim()
> >
> >
> >
> > public void run() {
> >
> >
> > while (keepDrawing) {
> >
> > repaint(); //call paint
> >
> > try {
> >
> > Thread.sleep(10); //sleep a little to slow it down
> >
> > }
> >
> > catch (InterruptedException ie_excp) {
> >
> > System.err.println("Error: " + ie_excp);
> >
> > }
> >
> > } //end while
> >
> > } // end run()
> >
> >
> >
> > public void paintComponent(Graphics graphics) {
> >
> >
> > if (!keepDrawing) {
> >
> > /* If we DON'T paint the parent class (super), other parts of the GUI
> which
> > imbed this
> >
> > * panel overwrite the area where the animation is drawn. If we DO paint
> the
> > parent
> >
> > * class, the animation is blanked out so it disappears when the
animation
> is
> > stopped
> >
> > * rather than freezing on the last frame.
> >
> > */
> >
> > super.paintComponent(graphics);
> >
> > return;
> >
> > }
> >
> > else {
> >
> > super.paintComponent(graphics);
> >
> > graphics.drawImage(animation, 0, 0, this);
> >
> > }
> >
> > } //end paint()
> >
> >
> >
> > public Dimension getPreferredSize() {
> >
> >
> > return new Dimension(stillWidth, stillHeight);
> >
> > }
> >
> > } //end of class
> >
> >
> > --
> >
> > Rhino
> > ---
> > rhino1 AT sympatico DOT ca
> > "If you want the best seat in the house, you'll have to move the cat."
> >
> >
>
>
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- In reply to: ak: "Re: Need some help with animation"
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