use array to form bouncing ball(please look at codes)

int m=0;

int[] xPosBall=new int[500];

int n=-1;

int l=-1;

void setup(){

  size(500, 500);

  for (int i=0; i<500;i++) {

    xPosBall[i]=i;

  }

}

​

void draw() {

  noStroke();

  fill(255, 103, 0);

  background(0, 162, 135);

  for (int i=0; i<499;i++) {

    xPosBall[i]=xPosBall[i+1]; 

    xPosBall[499]=m;

    m=xPosBall[0];

  } 

 //for above for loop; the position of ball xPosBall[0] get larger when next void draw happends, it will be like 0,1,2,3....497,498,0,1,2,3,...497,498,0.......no end.

  if(xPosBall[498]==498){

    n=-n;

    l=-l;

  } 

  ellipse(250*(l+1)-n*xPosBall[0], height/2, 35, 35);

  println(xPosBall[499]);

}

​

​

​