KoordinateKween.pde

color c = color(255, 204, 0);
float rect_theta = 0.25;
void setup() {
  size(300, 300);
  fill(c);
}

void draw() {
  for (float step = 0; step < TWO_PI; step += 0.01) {
    point(50*cos(step) + 150, 100*sin(step) + 150);
  }

  float x1 = 50 * cos(rect_theta), y1 = 100 * sin(rect_theta),
      x2 = 50 * cos(PI - rect_theta), y2 = 100 * sin(PI - rect_theta),
      x3 = 50 * cos(PI + rect_theta), y3 = 100 * sin(PI + rect_theta),
      x4 = 50 * cos(TWO_PI - rect_theta), y4 = 100 * sin(TWO_PI - rect_theta);

//println("x1 "+x1+" y1 "+y1);
//println("x2 "+x2+" y2 "+y2);
//println("x3 "+x3+" y3 "+y3);
//println("x4 "+x4+" y4 "+y4);
  rect(x3 + 150, y3 + 150, x1 - x3, y1 - y3);
  rect_theta += 0.01;
}