uni_informatik_projekt/src/break_out/model/Ball.java

package break_out.model;

import break_out.Constants;

/**
 * This class contains the information about the balls characteristics and behavior
 * 
 * @author iSchumacher
 * @author modified by Gruppe 175: Moritz Henseleit, Ruben Meyer
 *
 */
public class Ball implements IBall{

	/**
	 * The balls position on the playground
	 */
	private Position position;
	
	/**
	 * The balls direction
	 */
	private Vector2D direction;
	
	/**
	 * The constructor of a ball
	 * The balls position and direction are initialized here.
	 */
	public Ball() {
		this.position = new Position(0, 0);
		this.direction = new Vector2D(Constants.BALL_SPEED,Constants.BALL_SPEED);
		this.direction.rescale();

		// start at bottom-center
        this.position.setX((Constants.SCREEN_WIDTH - Constants.BALL_DIAMETER)/2);
        this.position.setY(Constants.SCREEN_HEIGHT-Constants.BALL_DIAMETER);
	}
	
	/**
	 * The getter for the balls position
	 * @return position The balls current position
	 */
	public Position getPosition() {
		return this.position;
	}
	
	/**
	 * The getter for the balls direction
	 * @return direction The balls current direction
	 */
	public Vector2D getDirection() {
		return this.direction;
	}
	
	/**
	 * updates ball position
	 */
	public void updatePosition() {
		// sets X position
        this.position.setX(this.position.getX()+this.direction.getDx());

        // sets Y position
        this.position.setY(this.position.getY()+this.direction.getDy());
	}
	
	/**
	 * Ball reacts to contact with the borders
	 */
	public void reactOnBorder() {
        // reacts on left border
        if(this.position.getX() <= 0) {
        	this.position.setX(0);
        	this.direction.setDx(-(this.direction.getDx()));
		}

	    // reacts on right border (-Diameter because of hitbox)
		if(this.position.getX() >= Constants.SCREEN_WIDTH - Constants.BALL_DIAMETER) {
			this.position.setX(Constants.SCREEN_WIDTH - Constants.BALL_DIAMETER);
			this.direction.setDx(-(this.direction.getDx()));
		}

        // reacts on top border
        if(this.position.getY() <= 0) {
        	this.position.setY(0);
        	this.direction.setDy(-(this.direction.getDy()));
		}

        // reacts on bottom border (+Diameter because of hitbox)
        if(this.position.getY() >= Constants.SCREEN_HEIGHT - Constants.BALL_DIAMETER) {
        	this.position.setY(Constants.SCREEN_HEIGHT - Constants.BALL_DIAMETER);
        	this.direction.setDy(-(this.direction.getDy()));
		}
	}
	
}