/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://fsdesign.sketchpad.cc/sp/pad/view/ro.q3K4kN8$tF1/rev.8
 * 
 * authors: 
 *   Ari Bader-Natal

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



// http://studio.sketchpad.cc/sp/pad/view/ro.9e1X10Jtx2k2r/latest

float angle = 0.0;
float angle2 = -1.0;
float angle3 = 0.0;
float angle4 = -1.0;
 
void setup() {
  size(640, 480);
  smooth();
}
 
void draw() {
  strokeWeight(1);
  strokeCap(SQUARE);
  stroke(30);
  background(255);
  translate(width/2, height/2);
 
  rotate(angle);
  angle += 0.0009;
  for (int i = -width; i <= width; i +=10) {
    line(i, -width, i, width);
  }
 
  rotate(angle2);
  angle2 += -0.0009;
  stroke(30);
  for (int i = -height; i <= height; i +=10) {
    line(-width, i, width, i);
  }
 
  rotate(angle3);
  angle3 += 0.0008;
  for (int i = -width; i <= width; i +=6) {
    line(i, -width, i, width);
  }
 
  rotate(angle4);
  angle4 += -0.0008;
  for (int i = -width; i <= width; i +=6) {
    line(-width, i, width, i);
  }
}