/*************************************************************************
  *  Compilation:  javac DiamondTile.java
  *  Execution:    java DiamondTile N
  *  Dependencies: StdDraw.java
  *
  *  Create an N-by-N diamond tile.                (Web Ex. 2.1.1)
  *************************************************************************/

public class DiamondTile {

   // draw a diamond outline, center at (x, y), diagonals = 2*size 
   public ________ void diamond(double x, double y, double size) {
      ________[] px = { x + size, x,        x - size, x };
      ________[] py = {                                 };
      StdDraw.polygon( _______, _________ );
   }

   // draw a filled diamond, center at (x, y), diagonals = 2*size 
   public static ______ filledDiamond(double x, double y, double size) {
      double[] px = { x + size, x,        x - size, x };
      double[] py = { y,        y + size, y       , y - size };
      _______________________________________________________
   }
  
   public static void main(String[] args) {
      int N = Integer.parseInt(args[0]);
     
      // for easy computation, set scale to match pattern
      StdDraw.setXscale(0, N);
      StdDraw.setYscale(0, N);

      for (int i = 0; i < N; i++) {
         for (int j = 0; j < N; j++) {

            // black diamond
            StdDraw.setPenRadius();
            StdDraw.setPenColor(StdDraw.BLACK);
            filledDiamond(i+.5, j+.5, .5);

            // red outline
            StdDraw.setPenRadius(.005);
            ______________________________________
            diamond(_______ , _____ , ____);
         }
      }
   }                
}