Re: Need some help with animation

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Date: Thu, 27 Nov 2003 08:32:54 -0500

"ak" <k.andrei@gmx.de.spam> wrote in message news:bq2ssn$u2a$1@online.de...
>
> "Rhino" <rhino1@NOSPAM.sympatico.ca> schrieb im Newsbeitrag
> news:fd2xb.13868$dt2.1004213@news20.bellglobal.com...
> >
> > "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.
>
> Yes, file contains all frames, but java picks only the first of them.
>
Try running my code with any animated GIF of your choice. You'll see that it
is playing all the frames in the file.

> >
> > > 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."
> > > >
> > > >
> > >
> > >
> >
> >
>
>

• Previous message: Jimbob: "a simple java timer"
• In reply to: ak: "Re: Need some help with animation"
• Next in thread: znôrt: "Re: Need some help with animation"
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