/* Cubism
   Heavily based on sketch by Ira Greenberg.
   
   Press any mouse button to generate another set of cubes.
   
*/

float randShift = .2;
int quadW = 15;
int quadH = quadW;
float[]q = { -quadW / 2, -quadH /2, quadW, quadH};

void setup() 
{
  size(600, 600);
  background(255);
  smooth();
  noStroke();
  frameRate(30);
  
  generateGrid();
 
}

void generateGrid()
{
  
  /* generate a table structure of quads progressively adding more randomization to each quad */
  for (int i = 0, k = 1; i < height - quadH; i += quadH, k++) 
  {
    /* resetting the transformation matrix keeps the translations from continually accumulating */
    resetMatrix();
    translate(0, quadH * k);
    for (int j = 0; j < width - quadW; j+= quadW)
    {
      translate(quadW, 0);
      fill(random(0, 255), random(0, 255), random(0, 255));
      quad(q[0] + r(k),         q[1] + r(k), 
           q[0] + q[2] + r(k),  q[1] + r(k),
           q[0] + q[2] + r(k),  q[1] + q[3] + r(k),
           q[0] + r(k),         q[1] + q[3] + r(k));
    }
  }
}

float r(int i)
{
  return random(-1 * randShift, i * randShift);
}

void draw() 
{
// generateGrid();
}

void mousePressed()
{
  background(255);
  generateGrid();
  }