Re: Need some help with animation
From: ak (k.andrei_at_gmx.de.spam)
Date: 11/26/03
- Next message: John Wheeler: "Re: Custom ComboBox Editor in JTable focus issue"
- Previous message: Scott Vetter: "Re: setLocation problem"
- In reply to: Rhino: "Re: Need some help with animation"
- Next in thread: Rhino: "Re: Need some help with animation"
- Reply: Rhino: "Re: Need some help with animation"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Wed, 26 Nov 2003 19:54:36 +0100
"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$1@online.de...
> > You have some mistakes here.
> >
> > a) you load only FIRST frame from your GIF, try to use ImageIO to get
all
> of
> > them
>
> Not really. You are right that I am loading only only file but that file
is
> an animated GIF (GIF89a) so it contains all the frames.
Yes, file contains all frames, but java picks only the first of them.
>
> > b) use MemoryImageSource to create animation. See javadoc for details.
> >
> I'll have a look at this.
>
> Thanks!
>
> Rhino
> >
> >
> > "Rhino" <rhino1@NOSPAM.sympatico.ca> schrieb im Newsbeitrag
> > news:0iQwb.12685$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."
> > >
> > >
> >
> >
>
>
- Next message: John Wheeler: "Re: Custom ComboBox Editor in JTable focus issue"
- Previous message: Scott Vetter: "Re: setLocation problem"
- In reply to: Rhino: "Re: Need some help with animation"
- Next in thread: Rhino: "Re: Need some help with animation"
- Reply: Rhino: "Re: Need some help with animation"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
