int MAX = 350;

int[] xspeed = new int[MAX];
int[] yspeed = new int[MAX];
int[] x = new int[MAX];
int[] y = new int[MAX];
int[] r = new int[MAX];
void setup()
{
  size(300,300,P3D);
  background(0);
  
  for (int i = 0; i < MAX; i++) {
    xspeed[i] = int(random(-5,5));
    yspeed[i] = int(random(-5,5));
    x[i] = width/2;
    y[i] = height/2;
    r[i] =10;
  }
  ellipseMode(CENTER);   
  noStroke();
  }
  
void draw()
{
 
  float b=random(250);
  float c=random(5);
  float d=random(250);
  for (int i=0;i<MAX;i++)
  {
   fill(b,c,d);   //set ellipse color
    if (r[i] > 10) {
    r[i]=10;
    }
    ellipse(x[i],y[i],r[i],r[i]);  //draw ellipse
    
    x[i] = x[i] + xspeed[i];
    y[i] = y[i] + yspeed[i];

    if ((x[i] > width) || (x[i] < 0)) {
      xspeed[i] = xspeed[i] * -1;
      r[i] = 30; //adjust radius when bouncing
    }
    if ((y[i] > height) || (y[i] < 0)) {
      yspeed[i] = yspeed[i] * -1;
      r[i] = 30;
    }
  }
 // saveFrame();
  }