PImage pic;
int picDimension;
  
color temporaryColor;

int positionsX = 150;    
int positionsY = 150;    


/***********************create a 2Darray of PixelRects*************************/ 

PixelRect[][] pixrect;   

float rotX;
float rotY;
float rotZ;

void setup(){

  frameRate(30);
  
  pic = loadImage("japanFoto.jpg");                        // load a picture, you have added to the file
  size(pic.width, pic.height, P3D);                                    
  println("w " +pic.width + " h " +pic.height);
  image(pic,0,0);                                          // place the image at the upper left corner of the applet
  
  picDimension = (pic.width*pic.height);                   // to get how many pixels the picture has
  println("Number of Pixels of the pic: " + picDimension);
  
  pixrect = new PixelRect[pic.width][pic.height];
  int sqSize = (int)((pic.width/positionsX)/2);            // dimensions of each pixelrect in the grid
  
  
/*************** access all the positions of the array *****************/ 
  
   for(int i = 0; i < pic.width; i++){     
     for(int j = 0; j < pic.height; j++){
       
       temporaryColor = pic.pixels[j*pic.width+i];        // to get the color of each pixel of the picture
       pixrect[i][j] = new PixelRect(i, j, sqSize, temporaryColor);
     } 
   }
   
}

void draw(){

 background(200); 

 rotateX(rotX);
 rotateY(rotY);
 rotateZ(rotZ);

 for (int i = 0; i < pic.width; i++){          
   for(int j = 0; j < pic.height; j++){
    
     noStroke();     
     pixrect[i][j].swapColors();
     pixrect[i][j].drawPixelRect();
   }
  }
}


void mouseDragged()
{
  if(mouseButton == LEFT)                       
  {
   rotY += ((mouseX - pmouseX) * 0.01);         
   rotX -= ((mouseY - pmouseY) * 0.01); 
  }else if(mouseButton == RIGHT)
   {
    rotZ += ((mouseX - pmouseX) * 0.01);
   }
}