public Point getEmptyPosition(Dimension spriteSize) {
Rectangle trialSpaceOccupied = new Rectangle(0, 0, spriteSize.width, spriteSize.height);
Random rand = new Random(System.currentTimeMillis());
boolean empty = false;
int numTries = 0;
// Search for an empty position
while (!empty && numTries++ < 100) {
// Get a trial position
trialSpaceOccupied.x = Math.abs(rand.nextInt() % backgroundImage.getSize().width);
trialSpaceOccupied.y = Math.abs(rand.nextInt() % backgroundImage.getSize().height);
// Iterate through existing
// sprites, checking if position
// is empty
boolean collision = false;
for (int cnt = 0; cnt < size(); cnt++) {
Rectangle testSpaceOccupied = ((Sprite) elementAt(cnt)).getSpaceOccupied();
if (trialSpaceOccupied.intersects(testSpaceOccupied)) {
collision = true;
} // end if
} // end for loop
empty = !collision;
} // end while loop
return new Point(trialSpaceOccupied.x, trialSpaceOccupied.y);
} // end getEmptyPosition()
public void drawScene(Graphics g) {
// Draw the background and erase
// sprites from graphics area
// Disable the following statement
// for an interesting effect.
backgroundImage.drawBackgroundImage(g);
// Iterate through sprites, drawing
// each sprite
for (int cnt = 0; cnt < size(); cnt++) ((Sprite) elementAt(cnt)).drawSpriteImage(g);
} // end drawScene()