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Bouncing Ball

int xpos ;
int diam = 30;
int dir = 1;
int speed = 1;

void setup(){
  //hi
  size(329,480);
  frameRate(300);
  xpos = 0;

}


void draw(){
  //speed = mouseY/100;
  background(127);
  ellipse(xpos,100, diam,diam);  //move the ball
  if (xpos >=  width - diam/2){
   dir = -1;
  }
  if (xpos <= 0 + diam/2){
   dir = 1;
  }
   xpos = xpos + dir*speed;

   println(xpos);
}