p211

// based on code from:
// P_2_1_1_01.pde
//
// Generative Gestaltung, ISBN: 978-3-87439-759-9
// First Edition, Hermann Schmidt, Mainz, 2009
// Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
// Copyright 2009 Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
//
// http://www.generative-gestaltung.de


int tileCount = 20;
int actRandomSeed = 0;
int actStrokeCap = ROUND;
float sw0, sw1, theta;


void setup() {
  size(500, 500);
}


void draw() {

  background(255);
  noFill();
  strokeCap(PROJECT);

  randomSeed(actRandomSeed);

  sw0=map(sin(theta),-1,1,3,22);
  sw1=sw0*2;

  for (int gridY=0; gridY<tileCount; gridY++) {
    for (int gridX=0; gridX<tileCount; gridX++) {

      int posX = width/tileCount*gridX;
      int posY = height/tileCount*gridY;

      int toggle = (int) random(0, 2);

      if (toggle == 0) {
        strokeWeight(sw0);
        stroke(0);
        line(posX, posY, posX+width/tileCount, posY+height/tileCount);
      }
      if (toggle == 1) {
        strokeWeight(sw1);
        stroke(255);
        //line(posX, posY+width/tileCount, posX+height/tileCount, posY);
      }
    }
  }
  theta += 0.0523;

  //if (frameCount % 2 == 0 && frameCount < 121) saveFrame("image-###.gif");
}


void mousePressed() {
  actRandomSeed = (int) random(100000);
}