// Example 09-02 from "Getting Started with Processing" 
// by Reas & Fry. O'Reilly / Make 2010

JitterBug jit;
JitterBug bug;

void setup() {
  size(480, 120);
  smooth();
  jit = new JitterBug(width * 0.33, height/2, 50);
  bug = new JitterBug(width * 0.66, height/2, 10);
}

void draw() {
  jit.move();
  jit.display();
  bug.move();
  bug.display();
} 

class JitterBug {

  float x;
  float y;
  int diameter;
  float speed = 2.5;

  JitterBug(float tempX, float tempY, int tempDiameter) {
    x = tempX;
    y = tempY;
    diameter = tempDiameter;
  }

  void move() {
    x += random(-speed, speed);
    y += random(-speed, speed);
  }

  void display() {
    ellipse(x, y, diameter, diameter);
  } 
}