ArrayList balls = new ArrayList();
int mode = 2;
int W;
int H;
boolean online;

void setup() {
  if (online == false) {
    W = 800;
    H = 300;
  } 
  else {
    W = 600;
    H = 200;
  }
  size(W,H);
  smooth();
  frameRate(30);
  for (int i=0;i<W/10;i++) {
    for (int j=0;j<H/10;j++) {
      balls.add(new Ball(5+i*10,5+j*10, sin(i), sin(j)));
    }
  }
}

void draw() {
  background(0);
  for (int i=0;i<balls.size();i++) {
    Ball bb = (Ball) balls.get(i);
    bb.update();
  }
}

class Ball {
  PVec loc;
  float sinX;
  float sinY;
  float x;
  float radius;

  Ball(float x_, float y_, float sinX_, float sinY_) {
    loc = new PVec(x_,y_,0);
    sinX = sinX_;
    sinY = sinY_;
  }

  void update() {
    render();
  }

  void render() {
    x+= 0.1;
    noStroke();
    if (mode == 1) {
      radius = 8 * sin(x*sinY*sinX);
    } 
    else if (mode == 2) {
      radius = 8 * sin(x+sinY+sinX);
    }
    fill(255);
    ellipse(loc.x,loc.y,radius, radius);
  }
}

class PVec
{
  float x;
  float y;
  float z;

  PVec(float x_, float y_, float z_)
  {
    x = x_;
    y = y_;
    z = z_;
  }
}