/** Paints a loading screen to show progress with downloading jar files. */
private synchronized void update() {
if (splashScreenImageGraphics == null) {
// create splash screen image for fast drawing
width = parentApplet.getWidth();
height = parentApplet.getHeight();
if (width <= 0 || height <= 0) return;
splashScreenImage = parentApplet.createImage(width, height);
if (splashScreenImage != null) {
splashScreenImageGraphics = splashScreenImage.getGraphics();
// load splash image and animated progress image
splashImage = parentApplet.getImage(AppletSplashScreen.class.getResource("splash.png"));
progressImage = parentApplet.getImage(AppletSplashScreen.class.getResource("spinner.gif"));
} else {
// we couldn't get splashScreenImageGraphics
return;
}
}
Graphics2D g = (Graphics2D) splashScreenImageGraphics;
// white background
g.setColor(Color.white);
g.clearRect(0, 0, width, height);
// splash image position
int splashX = -1;
int splashY = -1;
if (splashImage != null) {
splashX = (width - SPLASH_IMAGE_WIDTH) / 2;
splashY = (height - SPLASH_IMAGE_HEIGHT) / 2 - (int) (1.5 * PROGRESS_IMAGE_HEIGHT);
}
// progress image position
int progressX = (width - PROGRESS_IMAGE_WIDTH) / 2;
int progressY = (height - PROGRESS_IMAGE_HEIGHT) / 2;
// Splash image fits into content pane: draw splash image
if (splashX >= 0 && splashY >= 0) {
g.drawImage(splashImage, splashX, splashY, this);
// put progress image below splash image
progressY = splashY + SPLASH_IMAGE_HEIGHT;
}
// draw progress image
g.drawImage(progressImage, progressX, progressY, this);
}
public AppletSplashScreen(GeoGebraApplet parentApplet) {
this.parentApplet = parentApplet;
// update splash screen image and paint it
update();
parentApplet.repaint();
}
/**
* Updates the progress image (animated gif) in the SplashScreen loading. Implements
* ImageObserver.
*/
public boolean imageUpdate(Image img, int flags, int x, int y, int w, int h) {
// stop after dispose() was called
if (dispose) return false;
// repaint applet to update progress image
update();
parentApplet.repaint();
return true;
}