Chess in processing Day 1

Cell[][] cell = new Cell[8][8];
int w;
Piece[] piece = new Piece[32];

void setup(){
   size(400,400);
   w = width/8;
   textSize(w);
   for(int i = 0; i < 8; i++){
     for(int j = 0; j < 8; j++){
       cell[i][j] = new Cell(i,j,w);
     }
   }
   makePieces();

}

void draw(){
   backGround();
   showPieces();
   piece[0].show();
}

void makePieces(){
  for(int i = 0; i < 16; i++){
    if(i < 8){ //PAWNS
      piece[i] = new Piece(i, 1, 'P', true);  //Black pieces
      piece[i+16] = new Piece(i, 6, 'P', false);  //White Pieces
    } else if(i == 8 || i == 15){  //ROOKS
      piece[i] = new Piece(i-8, 0, 'R', true);
      piece[i+16] = new Piece(i-8, 7, 'R', false);
    } else if(i == 9 || i == 14){  //'N'IGHTS
      piece[i] = new Piece(i-8, 0, 'N', true);
      piece[i+16] = new Piece(i-8, 7, 'N', false);
    } else if(i == 10 || i == 13){  //Bishops
      piece[i] = new Piece(i-8, 0, 'B', true);
      piece[i+16] = new Piece(i-8, 7, 'B', false);
    } else if(i == 11){  //Queens
      piece[i] = new Piece(i-8, 0, 'Q', true);
      piece[i+16] = new Piece(i-8, 7, 'Q', false);
    } else {  //Kings
      piece[i] = new Piece(i-8,0,'K',true);
      piece[i+16] = new Piece(i-8,7,'K',false);
    }
  }
}

void showPieces(){
  for(int i = 0; i < piece.length; i++){
    piece[i].show();
  }
}

void backGround(){
   for(int i = 0; i < 8; i++){
     for(int j = 0; j < 8; j++){
       cell[i][j].show();
     }
   }
}

public class Cell{
  int row;
  int column;
  int w;
  boolean hasPiece;
  boolean isSelected;

  public Cell(int i, int j, int w){
    this.row = i;
    this.column = j;
    this.hasPiece = false;
    this.isSelected = false;
    this.w = w;
  }

  public void show(){
    if((this.row + this.column)%2 == 0){
      fill(0, 0, 255);
    } else {
      fill(255,0,0);
    }
    rect(this.row*this.w, this.column*this.w, this.w, this.w);
  }
}

public class Piece{
  int x;
  int y;
  char ch;
  boolean onBoard;
  boolean isBlack;

  public Piece(int x, int y, char ch, boolean isBlack){
     this.x = x;
     this.y = y;
     this.ch = ch;
     this.isBlack = isBlack;
  }

  public void show(){
    if(this.isBlack){
      fill(0);
    } else {
      fill(255);
    }
    text(this.ch, (this.x+.15)*w, (this.y+.85)*w);
  }
}