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Ball - reflectOnPaddle - structuring and comments

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rxbn_ 2019-12-07 23:58:50 +01:00
parent af40f082d6
commit 131dedb22e
1 changed files with 31 additions and 17 deletions
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48
src/break_out/model/Ball.java
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@ -140,29 +140,43 @@ public class Ball implements IBall {
/** /**
* Ball got hit by Paddle paddle * Ball got hit by Paddle paddle
* @param paddle hitbox mechanism of paddle * @param paddle hitbox mechanism of paddle
* @todo implementation
*/ */
public void reflectOnPaddle(Paddle p) { public void reflectOnPaddle(Paddle paddle) {
// get the Position of the middle of the paddle // reflection point / offset point
Position newOffset = new Position( Position reflectionPoint = new Position(
p.getPosition().getX() + p.getWidth() / 2.0,//the middle of the x coordinates paddle.getPosition().getX() + (paddle.getWidth() / 2.0),
p.getPosition().getY() + p.getHeight() / 2.0);//the middle of the y coordinates paddle.getPosition().getY() + (paddle.getHeight() / 2.0)
);
// new direction vector; assignment not here
Vector2D reflectionVector;
// no general solution, estimation required
// only two paddles defined in the game design, therefore greater or smaller than middle of screen
//deciding if the paddle is at the top or bottom to adjust if its +or- y direction //deciding if the paddle is at the top or bottom to adjust if its +or- y direction
if (p.getPosition().getY() == 0) { if (paddle.getPosition().getY() <= Constants.SCREEN_HEIGHT) {
newOffset.setY(newOffset.getY() - Constants.REFLECTION_OFFSET);// paddle at the top with negative direction // top paddle
} else { reflectionPoint.setY(reflectionPoint.getY() - Constants.REFLECTION_OFFSET);
newOffset.setY(newOffset.getY() + Constants.REFLECTION_OFFSET); // the paddle at the bottom with positive direction } else {
// bottom paddle
reflectionPoint.setY(reflectionPoint.getY() + Constants.REFLECTION_OFFSET);
} }
// calculating the center of the ball by dividing by zero // calculating the center of the ball; needed for correct vector calculation
Position ballCenter = new Position( Position ballCenter = new Position(
position.getX() + Constants.BALL_DIAMETER/2.0, //the middle of the x coordinates position.getX() + (Constants.BALL_DIAMETER/2.0),
position.getY() + Constants.BALL_DIAMETER/2.0); //the middle of the y coordinates position.getY() + (Constants.BALL_DIAMETER/2.0)
);
// The direction is set to the middle of the offset point and the ball // The direction is set to the vector between offset point and the ball's center
direction = new Vector2D(newOffset, ballCenter); reflectionVector = new Vector2D(reflectionPoint, ballCenter);
// rescaling to adjust the balls speed
direction.rescale(); // normalize vector
reflectionVector.rescale();
// replace direction vector
this.direction.setDx(reflectionVector.getDx());
this.direction.setDy(reflectionVector.getDy());
} }
} }