public boolean collision(GObject a, GObject b) {
if (a.getBounds().intersects(b.getBounds())) {
return true;
} else {
return false;
}
}
/**
* Creates a point at the ball 4 check and verifies the presence of an object near it. Returns
* null or the name of the object, if it is present
*/
private GObject getCollidingObject() {
GObject colliding;
colliding =
getElementAt(ball.getX(), ball.getY()); // Creates the upper left point of check ball
if (colliding != null) {
Color color = colliding.getColor();
count(color);
return colliding;
}
colliding =
getElementAt(
ball.getX() + BALL_RADIUS * 2,
ball.getY()); // Creates the top right point of check ball
if (colliding != null) {
Color color = colliding.getColor();
count(color);
return colliding;
}
colliding =
getElementAt(
ball.getX(),
ball.getY() + BALL_RADIUS * 2); // Creates the lower left point of check ball
if (colliding != null) {
Color color = colliding.getColor();
count(color);
return colliding;
}
colliding =
getElementAt(
ball.getX() + BALL_RADIUS * 2,
ball.getY() + BALL_RADIUS * 2); // Creates a check point of the lower right on the ball
if (colliding != null) {
Color color = colliding.getColor();
count(color);
return colliding;
}
return null;
}
/**
* Called after the body has moved to update the leg motion accordingly. This method does not use
* a particularly convincing leg motion algorithm; low-budgets Saturday morning cartoons would be
* proud.
*/
public void bodyMovedBy(double dx, double dy) {
if (anchored) {
graphics.move(-dx, -dy);
} else {
double speed = Math.hypot(dx, dy),
targetX = restPosition.getX() + dx / speed * rangeOfMotion,
targetY = restPosition.getY() + dy / speed * rangeOfMotion,
toTargetX = targetX - graphics.getX(),
toTargetY = targetY - graphics.getY(),
distToTarget = Math.hypot(toTargetX, toTargetY);
graphics.move(toTargetX / distToTarget * speed * 1.5, toTargetY / distToTarget * speed * 1.5);
}
double distention =
Math.hypot(graphics.getX() - restPosition.getX(), graphics.getY() - restPosition.getY());
if (distention >= rangeOfMotion) anchored = !anchored;
}
public void play() {
GCanvas canvas = getGCanvas();
ball.move();
if (ball.getX() < 0 || ball.getX() + ball.getDiameter() > WIDTH) {
ball.bounceX();
}
if (ball.getY() < 0) {
ball.bounceY();
}
if (ball.getY() + ball.getDiameter() > HEIGHT) {
lives--;
lifeDisplay.setLabel(String.format("Lives remaining: %d", lives));
if (lives <= 0) {
showMessage("DEFEAT!");
} else {
ball.setLocation(WIDTH / 2 - BALL_RADIUS, HEIGHT / 2 - BALL_RADIUS);
}
return;
}
for (int i = 0; i < 4; i++) {
GPoint point =
new GPoint(
ball.getX() + (i & 1) * ball.getDiameter(),
ball.getY() + ((i & 2) / 2) * ball.getDiameter());
GObject o = canvas.getElementAt(point);
if (o == null) {
continue;
}
if (o instanceof BreakoutBrick) {
canvas.remove(o);
bricksRemaining--;
if (bricksRemaining <= 0) {
showMessage("VICTORY!");
}
} else if (o instanceof BreakoutPaddle) {
paddleBounces++;
if (paddleBounces > NPADDLE_BOUNCES) {
paddleBounces = 0;
ball.accelerate(1.0);
}
}
if (point.getX() < o.getX() + o.getWidth() || point.getX() < o.getX()) {
ball.bounceX();
}
if (point.getY() < o.getY() + o.getHeight() || point.getY() < o.getY()) {
ball.bounceY();
}
return;
}
}
/**
* Critters should instantiate legs from their createGraphics() methods.
*
* @param graphics The visual representation of the leg, positioned at rest.
* @param rangeOfMotion How far away from its rest position the leg is allowed to move.
*/
public Leg(GObject graphics, double rangeOfMotion) {
this.graphics = graphics;
this.restPosition = graphics.getLocation();
this.rangeOfMotion = rangeOfMotion;
}