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- import greenfoot.*;
- /**
- *
- *
- */
- public class Ball extends Actor
- {
- /**
- * Responds to motion control from the arrow keys and removes
- * any buttons from the world when it intersects them.
- */
- public void act() {
- handleKeyPress();
- lookForButton();
- }
- /**
- * Handles input from the arrow keys.
- */
- public void handleKeyPress() {
- checkLeftArrow() ;
- checkRightArrow() ;
- checkUPArrow() ;
- checkDownArrow() ;
- }
- }
- /**
- * Checks to see if the left arrow key is being pressed.
- * If it is, then the ball sets its rotation angle to zero degrees
- * and moves backward 5 units. If it is not being pressed,
- * this method does nothing.
- */
- public void checkLeftArrow() {
- public void act() {
- if (Greenfoot.isKeyDown("left")
- {
- setRotation(0);
- turn(-5);
- }
- }
- }
- /**
- * Checks to see if the right arrow key is being pressed.
- * If it is, then the ball sets its rotation angle to zero degrees
- * and moves forward 5 units. If it is not being pressed,
- * this method does nothing.
- */
- public void checkRightArrow() {
- public void act() {
- if (Greenfoot.isKeyDown("right")
- {
- setRotation(0);
- turn(5);
- }
- }
- }
- /**
- * Checks to see if the up arrow key is being pressed.
- * If it is, then the ball sets its rotation angle to 270 degrees
- * and moves forward 5 units. If it is not being pressed,
- * this method does nothing.
- */
- public void checkUpArrow() {
- public void act() {
- if (Greenfoot.isKeyDown("up")
- {
- setRotation(270);
- turn(5);
- }
- }
- }
- /**
- * Checks to see if the down arrow key is being pressed.
- * If it is, then the ball sets its rotation angle to 90 degrees
- * and moves forward 5 units. If it is not being pressed,
- * this method does nothing.
- */
- public void checkDownArrow() {
- public void act() {
- if (Greenfoot.isKeyDown("down")
- {
- setRotation(90);
- turn(5);
- }
- }
- }
- public class Button extends Actor
- {
- /**
- * Checks to see if the ball is "touching" an object of the Button class.
- * If it is, then the ball removes from the World a Button that it touches.
- * If the ball isn't touching an object of the Button class, then this
- * method does nothing.
- */
- public void lookForButton() {
- Actor B =getOneIntersectingObject(Ball.class)
- if (isTouching(Ball.Class))
- {
- removeTouching(Ball.class)
- }
- }
- }
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