//Variance
Ball maru;   //Object
 
void setup() {
  size(400, 400);      //window
  background(0, 0, 0); //black
  noStroke();    //lineless
  maru = new Ball();   //instance
  maru.px = 200;
  maru.py = 100;
  maru.dia = 20;
}

void draw(){ 
  fill(255, 0, 255);  //ball color
  ellipse(maru.px, maru.py, maru.dia, maru.dia); 
  }

class Ball{
  float px, py;    //position
  float vx, vy;    //velocity
  float dia;       //diameter
}