/*
 * File: Checkerboard.java
 *------------------------
 * This program draws a checkerboard. The dimensions of
 * checkerboard are specified by the constant N_ROWS and
 * N_COLUMNS, and the size of the square is chosen so that
 * the checkerboard fills the available vertical space.
 */

import acm.graphics.*;
import acm.program.*;

public class Checkerboard extends GraphicsProgram {

   public void run() {
      double sqSize = (double) getHeight() / N_ROWS; /* square size */
      for (int i = 0; i < N_ROWS; i++) {
         for (int j = 0; j < N_COLUMNS; j++) {
            /* draw (i,j)th square */
            double x = j * sqSize;
            double y = i * sqSize;
            GRect sq = new GRect(x, y, sqSize, sqSize);
            sq.setFilled(((i + j) % 2) != 0);
            add(sq);
         } /* for j */
      } /* for i */
   }

/* private constants */
   private static final int N_ROWS = 8;
   private static final int N_COLUMNS = 8;
}