/** The main loop, that controls all the action. It repeats until game over. */
public void run() {
long start = System.nanoTime();
long elapsed;
long wait;
final int minTimeBetweenFrames = 5;
while (running) {
// Timing
// elapsed is the number of nanoseconds since last frame
elapsed = System.nanoTime() - start;
elapsed = Math.min(MAX_FRAME, elapsed);
start = System.nanoTime();
Point pos = hero.getPos();
frame++;
// Physics!
simulate(hero, elapsed);
// Move camera
updateCamPos();
// Test 'victory' conditions
if (pos.y < LOWER_BOUND) {
running = false;
}
// Test world events (like touching a light)
testTriggers(triggers);
// Delete (release) dead effects.
deleteDeadEntities();
// redraw everything
repaint();
// "elapsed" is reassigned to the number of nanoseconds
// since this frame began
elapsed = System.nanoTime() - start;
// wait is how much time is remaining
// before the next frame needs to be drawn.
wait = targetTime - elapsed / NS_PER_MS;
// wait at least 5 ms between frames.
if (wait < 0) {
wait = minTimeBetweenFrames;
}
try {
Thread.sleep(wait);
} catch (InterruptedException e) {
e.printStackTrace();
}
} // end while
} // end run
/** Move the camera so that our hero doesn't go off-screen. */
private void updateCamPos() {
final int marginX = (int) (getWidth() * 0.25);
final int marginTop = (int) (getHeight() * 0.2);
final int marginBottom = (int) (getHeight() * 0.2);
Point pos = hero.getPos();
Dimension dim = hero.getSize();
// update x motion
// If too far left
if (pos.x - marginX < offX) {
offX = pos.x - marginX;
// if too far right
} else if (pos.x + marginX > offX + getWidth() - dim.width) {
offX = pos.x + marginX - getWidth() + dim.width;
}
// update y motion
// If too low
if (pos.y - marginBottom < offY) {
offY = pos.y - marginBottom;
// If too high
} else if (pos.y + marginTop > offY + getHeight() - dim.height) {
offY = pos.y + marginTop - getHeight() + dim.height;
}
}