float rotation = 0;
LivingBox[] boxen;


void setup ()
{

  boxen = new LivingBox[1000];

  boxen[0] = new LivingBox(0, 0, 0.95, 0.95, 1);
  boxen[1] = new LivingBox(0, 0, 0.1, 0.1, 0.1);
  boxen[2] = new LivingBox(0, 0, 0.5, 0.5 ,0.4);

  size(600, 400, P3D);
  framerate(50);
  colorMode(RGB, 1.0);

  noStroke();

}



void draw ()
{

  background(0.55, 0.53, 0.5);

  ambientLight(0.75, 0.75, 0.75);
  directionalLight(1, 1, 1, 200, 200, 0);

  translate(300, 200, 0);
  rotateX(rotation);
  rotateY(rotation / 2);
  rotateZ(rotation / 3);

  pushMatrix();

  boxen[0].move();
  boxen[1].move();
  boxen[2].move();

  popMatrix();
  
  rotation += 0.05;

}



// Classes

class LivingBox {

  int stepSize = 5;
  int trailLen = 400;

  float posX;
  float posY;
  
  float[] oldPosX;
  float[] oldPosY;
  
  float thisRed;
  float thisGreen;
  float thisBlue;

  LivingBox(float x, float y, float r, float g, float b) {

    posX = x;
    posY = y;
  
    thisRed = r;
    thisGreen = g;
    thisBlue = b;
    
    oldPosX = new float[trailLen];
    oldPosY = new float[trailLen];
    
    for( int i = 0; i < trailLen; i++ ) {
      oldPosX[i] = 0;
      oldPosY[i] = 0;
    }
  
  }

  void move() {
  
    int direction = int(random(4));
    
    if( direction == 0 ) { posX += stepSize; }
    if( direction == 1 ) { posX -= stepSize; }
    if( direction == 2 ) { posY += stepSize; }
    if( direction == 3 ) { posY -= stepSize; }
    
    oldPosX[0] = posX;
    oldPosY[0] = posY;
    
    for( int i = trailLen-1; i >= 1; i-- ) { 
      oldPosX[i] = oldPosX[i-1];
      oldPosY[i] = oldPosY[i-1];
    }
    
    for( int i = 0; i < trailLen; i++ ) {
    
      pushMatrix();
  
      fill(thisRed, thisGreen, thisBlue);
      rotateX(oldPosX[i]/50);
      rotateY(oldPosY[i]/50);
      translate(150, 0);
      box(150*i/trailLen, 20*i/trailLen, 20*i/trailLen);
    
      popMatrix();
    }

  }
}