protected void startApp() throws MIDletStateChangeException
{
if (display == null)
{
display = Display.getDisplay(this);
initMIDlet();
}
}
}
/*
* License
*
* Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved.
*/
import java.util.Random;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.GameCanvas;
// A simple example of a game canvas that displays
// a scrolling star field. Use the UP and DOWN keys
// to speed up or slow down the rate of scrolling.
public class StarField extends GameCanvas implements Runnable
{
private static final int SLEEP_INCREMENT = 10;
private static final int SLEEP_INITIAL = 150;
private static final int SLEEP_MAX = 300;
private Graphics graphics;
private Random random;
private int sleepTime = SLEEP_INITIAL;
private volatile Thread thread;
public StarField()
{
super(true);
graphics = getGraphics();
graphics.setColor(0, 0, 0);
graphics.fillRect(0, 0, getWidth(), getHeight());
}
// The game loop.
public void run()
{
int w = getWidth();
int h = getHeight() - 1;
while (thread == Thread.currentThread())
{
// Increment or decrement the scrolling interval
// based on key presses
int state = getKeyStates();
if ((state & DOWN_PRESSED) != 0)
{
sleepTime += SLEEP_INCREMENT;
if (sleepTime > SLEEP_MAX)
sleepTime = SLEEP_MAX;
} else if ((state & UP_PRESSED) != 0)
{
sleepTime -= SLEEP_INCREMENT;
if (sleepTime < 0)
sleepTime = 0;
}
// Repaint the screen by first scrolling the
// existing starfield down one and painting in
// new stars...
