class PixelRect{
  
  int sidesize;          // the variable for the size of the pixels
  
  int posX;              // the variable for the X position of the pixels
  int posY;              // the variable for the Y position of the pixels
  
  color pixelcolor;      // the variable for the color of the pixels
  
    
 /*******************create the constructors********************/
 
  PixelRect(){      //Constructor I
    setPosition(getPositionX(), getPositionY());
    setColor(color((int)random(0,255)));
  }
  
  PixelRect(int x, int y, int ss, color q){      //Constructor II
     setPosition(x,y);
     setColor(q); 
     sidesize= ss;
  }
  
/*****************methods concering the position of a pixel*******************/

  void setPosition(int px, int py){
    posX = px;
    posY = py;
  }
    
  int getPositionX(){
    return posX;
  }  
 
  int getPositionY(){
    return posY;   
  }
  
/*****************methods concering the color of a pixel*******************/

  void setColor (color newColor){
    pixelcolor = newColor;
  }
  
  color getColor(){
    return  pixelcolor;
  }

/*********************method to draw the pixelrects***********************/  

  void drawPixelRect(){  
     fill(getColor());  
     rect(getPositionX() *sidesize, getPositionY()*sidesize, sidesize, sidesize); 
  }

/**************method to swap the colors of the pixelrects*****************/  
/* in this method the color of a pixelrect is compared with the color of the next 
  pixelrect beneath it, and if it is darker then they swap colors*/
  
  void swapColors(){
    int i = getPositionX();
    int j = getPositionY();
    if(j < pixrect[0].length-1 ){

       if(pixrect[i][j].pixelcolor < pixrect[i][j+1].pixelcolor){
         
         int tempcolor = pixrect[i][j+1].pixelcolor;
         pixrect[i][j+1].pixelcolor = pixrect[i][j].pixelcolor;
         pixrect[i][j].pixelcolor = tempcolor;
       }
    }
  }
  
}