public void run() {
    while (true) {
      // move ball to right
      // end when ball moves off right side of screen
      setup();
      while (ball.getX() < getWidth()) {
        moveBall();
        checkForCollision();
        pause(DELAY);
      }

      // move ball to left
      xVel = -X_VEL;
      X_START = getWidth() - DIAM_BALL;
      setup();
      while (ball.getX() > -DIAM_BALL - 5) {
        moveBall();
        checkForCollision();
        pause(DELAY);
      }

      X_START = DIAM_BALL / 2;
      xVel = X_VEL;
      yVel = 0.0;
    }
  }
示例#2
0
 private void checkWall() {
   boolean checkLeftWall = ball.getX() <= 0;
   boolean checkRightWall = ball.getX() + BALL_RADIUS * 2 >= WIDTH;
   boolean checkTop = ball.getY() <= 0;
   if ((checkLeftWall) || (checkRightWall)) {
     vx = -vx;
   }
   if (checkTop) {
     vy = -vy;
   }
 }
示例#3
0
  /** Check for collision */
  private void checkRebounce() {

    // check for left/right/top wall
    if (ball.getX() < 0) {
      vx *= -1;
      ball.move(vx, 0);
      return;
    } else if ((ball.getX() + 2 * BALL_RADIUS) > getWidth()) {
      vx *= -1;
      ball.move(vx, 0);
      return;
    } else if (ball.getY() < 0) {
      ball.setLocation(ball.getX(), -ball.getY());
      vy *= -1;
      return;
    }

    // check for collision with bricks: from the four vertexs
    lefttop = getElementAt(ball.getX(), ball.getY());
    righttop = getElementAt(ball.getX() + 2 * BALL_RADIUS, ball.getY());
    leftbottom = getElementAt(ball.getX(), ball.getY() + 2 * BALL_RADIUS);
    rightbottom = getElementAt(ball.getX() + 2 * BALL_RADIUS, ball.getY() + 2 * BALL_RADIUS);
    if ((lefttop != null) && (righttop != null) && (lefttop != board) && (lefttop != mylabel)) {
      remove(lefttop);
      num_brick_left--;
      vy *= -1;
    } else if ((righttop != null)
        && (rightbottom != null)
        && (righttop != board)
        && (righttop != mylabel)) {
      remove(righttop);
      num_brick_left--;
      vx *= -1;
    } else if ((rightbottom != null)
        && (leftbottom != null)
        && (rightbottom != board)
        && (rightbottom != mylabel)) {
      remove(rightbottom);
      num_brick_left--;
      vy *= -1;
    } else if ((leftbottom != null)
        && (lefttop != null)
        && (leftbottom != board)
        && (leftbottom != mylabel)) {
      remove(leftbottom);
      num_brick_left--;
      vx *= -1;
    }

    // check for collision with board
    if (getElementAt(ball.getX(), (ball.getY() + BALL_RADIUS / 2)) == board) {
      vy *= -1;
      ball.move(0, vy);
    }
  }
示例#4
0
 private void checkObject() {
   // x and y parameters for the different corners
   double leftX = ball.getX();
   double rightX = ball.getX() + (2 * BALL_RADIUS);
   double upperY = ball.getY();
   double lowerY = ball.getY() + (2 * BALL_RADIUS);
   // check the corners for object
   GObject upperLeft = checkCorner(leftX, upperY); // check upper-left corner
   if (upperLeft == null) {
     GObject upperRight = checkCorner(rightX, upperY); // check upper-right corner
   }
   GObject lowerLeft = checkCorner(leftX, lowerY); // //check lower-left corner
   if (lowerLeft == null) {
     GObject lowerRight = checkCorner(rightX, lowerY); // check lower-right corner
     if ((lowerLeft == paddle)
         && (lowerRight == paddle)) { // When both lower corners hit paddle, change direction.
       vy = -vy;
     }
   }
 }