/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://friendscentral.sketchpad.cc/sp/pad/view/ro.ocBC7ULK8aB/rev.2
 * 
 * authors: 
 *   Colin Angevine

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



float angle;
float angularAcc;
float angularVel;

float THRESHOLD;

void setup() {
  angle = 0;
  angularAcc = 0.001;
  angularVel = 0;
  THRESHOLD = 0.25;
  size(400, 400);
}

void draw() {
  angularVel = angularVel + angularAcc;
  angle = angle + angularVel;
  
  pushMatrix();
  translate(width/2, height/2);
  rotate(angle);
  rect(0, 0, 50, 50);
  popMatrix();
  
  if(angularVel > THRESHOLD || angularVel < -THRESHOLD) {
    angularAcc = angularAcc * -1;
    fill(random(255), random(255), random(255));
  }
}