hey guys in this code i want to make a bouncing ball but the ball is not bouncing...........so tell me whats wrong with it

1. float xPos = width/2;
2. float yPos = height/2;
3. int xDirection = 1;
4. int yDirection = 1;
5. float xSpeed = 2.2;
6. float ySpeed = 1.8;
7. int ballRed = 60;
8. float pRect;
9.   void setup(){
10.       size(600,300);
11.       smooth();
12.       frameRate(60);
13.       //noCursor();
14.   }
15.   void draw(){
16.       noStroke();
17.       fill(#64F7E2);
18.       rect(0,0,width/2,height);
19.       fill(#4DB2A3);
20.       rect(width/2,0,width/2,height);
21.       fill(#4DB2A3);
22.       pRect = getPRect();
23.       rect(20,pRect,10,40);
24.       ellipseMode(RADIUS);
25.       updateBall();
26.       fill(0);
27.       ellipse(xPos,yPos,ballRed,ballRed);
28.    
29.   }
30.   float getPRect(){
31.       if(mouseY<=height-38){
32.           return mouseY;
33.       }
34.       else
35.           return height-38;
36.   }
37.   void updateBall(){
38.     xPos += xSpeed*xDirection;
39.     yPos += ySpeed*yDirection;
40.     if(xPos>width-ballRed || xPos<ballRed){
41.       xDirection *= -1;
42.     }
43.     if(yPos>height-ballRed || yPos<ballRed){
44.       yDirection *= -1;
45.     }
46.   }