Aufgabe 2.2 - hitsPaddle(Paddle p) - tests whether the ball touches the paddle's hit box.

src/break_out/model/Ball.java

@@ -93,17 +93,51 @@ public class Ball implements IBall {
 	}
 
 	/**
-	 * test if Ball hits paddle
+	 * tests whether the ball touches the paddle's hit box.
 	 * @param paddle paddle which will be tested
-	 * @return true when ball hits paddle
+	 * @return true when ball hits the paddle
 	 */
 	public boolean hitsPaddle(Paddle paddle) {
+		// paddles position
+		Position posPaddle = paddle.getPosition();
+
+		// balls position
+		Position posBall = this.getPosition();
+
+		// test balls y position against paddles y values
+		boolean testPaddleY = (
+			(posBall.getY() <= posPaddle.getY()+paddle.getHeight() && posBall.getY() >= posPaddle.getY())
+			|| (posBall.getY()+Constants.BALL_DIAMETER >= posPaddle.getY() && posBall.getY() <= posPaddle.getY()+paddle.getHeight())
+		);
+
+		// test balls x position against paddles x values
+		boolean testPaddleX = (
+				posBall.getX() >= posPaddle.getX() && posBall.getX() <= posPaddle.getX()+paddle.getWidth()
+		);
+
+		// if balls y position is in paddles y values, verify x position
+		if(testPaddleY) {
+			// DEBUG OUTPUT
+			//System.out.println("ball is in y area of paddle: "+String.format("x, y, w, h: %s, %s, %s, %s", posPaddle.getX(), posPaddle.getY(), paddle.getWidth(), paddle.getHeight()));
+
+			// if ball is in paddles hit box
+			if(testPaddleX) {
+				// DEBUG OUTPUT
+				//System.out.println("ball hits paddle: "+String.format("x, y, w, h: %s, %s, %s, %s", posPaddle.getX(), posPaddle.getY(), paddle.getWidth(), paddle.getHeight()));
+
+				return true;
+			}
+
+		}
+
+		// default output, ball doesn't hit paddle
 		return false;
 	}
 
 	/**
 	 * Ball got hit by Paddle paddle
 	 * @param paddle hitbox mechanism of paddle
+	 * @todo implementation
 	 */
 	public void reflectOnPaddle(Paddle paddle) {
 		return;

src/break_out/model/Level.java

@@ -116,6 +116,10 @@ public class Level extends Thread implements ILevel {
 				// Call here the balls method for reacting on the borders of the playground
 				this.ball.reactOnBorder();
 
+				// if ball hits paddle (top|bottom), reflect ball
+				if(this.ball.hitsPaddle(paddleTop)) this.ball.reflectOnPaddle(paddleTop);
+				if(this.ball.hitsPaddle(paddleBottom)) this.ball.reflectOnPaddle(paddleBottom);
+
 
 				// Tells the observer to repaint the components on the playground
 				game.notifyObservers();