// Example 07-14 from "Getting Started with Processing" 
// by Reas & Fry. O'Reilly / Make 2010

float angle = 0.0;
float offset = 60;
float scalar = 30;
float speed = 0.05;

void setup() {
  size(120, 120);
  smooth();
}

void draw() {
  float x = offset + cos(angle) * scalar;
  float y = offset + sin(angle) * scalar;
  ellipse( x, y, 40, 40);
  angle += speed;
}