content: /*
   * Copyright (C) 2014 Madgalena Herbst
   * CONRAD is developed as an Open Source project under the GNU General Public License (GPL).
  */
  package edu.stanford.rsl.tutorial.noncircularfov;
  
  import edu.stanford.rsl.tutorial.phantoms.Phantom;
  
  /**
   * 
   * @author Magdalena
   * 
   */
  public class RectangleGrid2D extends Phantom {
  
  	/**
  	 * The constructor takes four arguments to initialize the grid. The
  	 * rectangle will be in the center and have the size 2*b x 2*a.
  	 * 
  	 * @param x
  	 *            no. of pixel in x-direction
  	 * @param y
  	 *            no. of pixel in y-direction
  	 * @param a
  	 * @param b
  	 */
  	public RectangleGrid2D(int x, int y, double a, double b) {
  		super(x, y, "RectangleGrid2D");
  
  		// Create rectangle in the grid.
  		double radiusA = a * x;
  		double radiusB = b * x;
  		int xcenter = x / 2;
  		int ycenter = y / 2;
  		float val = 1.f;
  
  		for (int i = 0; i < x; i++) {
  			for (int j = 0; j < y; j++) {
  				if (Math.abs(i - xcenter) <= radiusA
  						&& Math.abs(j - ycenter) <= radiusB) {
  					super.setAtIndex(i, j, val);
  				}
  			}
  		}
  	}
  }
  