Source Code : Union two rectangles

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Union two rectangles

     
/*
 * $Id: RectUtils.java,v 1.2 2008/02/28 14:38:48 david Exp $
 *
 * Copyright (c) 2008 Gaudenz Alder
 *
 */


import java.awt.geom.Rectangle2D;

public class RectUtils {
  /**
   * Unions the pair of source <code>Rectangle2D</code> objects and puts the
   * result into the returned <code>Rectangle2D</code> object. This method
   * extends the Rectangle2D version by checking for null parameters, the
   * returned value will also be <code>null</code> if the two input
   * rectangles are <code>null</code>
   * 
   * @param src1
   *            the first of a pair of <code>Rectangle2D</code> objects to
   *            be combined with each other
   * @param src2
   *            the second of a pair of <code>Rectangle2D</code> objects to
   *            be combined with each other
   * 
   */
  public static Rectangle2D union(Rectangle2D src1, Rectangle2D src2) {
    Rectangle2D result = null;
    if (src1 == null && src2 == null) {
      result = null;
    } else if (src1 != null && src2 != null) {
      double x1 = Math.min(src1.getMinX(), src2.getMinX());
      double y1 = Math.min(src1.getMinY(), src2.getMinY());
      double x2 = Math.max(src1.getMaxX(), src2.getMaxX());
      double y2 = Math.max(src1.getMaxY(), src2.getMaxY());
      result = new Rectangle2D.Double();
      result.setFrameFromDiagonal(x1, y1, x2, y2);
    } else if (src1 != null) {
      double x1 = src1.getMinX();
      double y1 = src1.getMinY();
      double x2 = src1.getMaxX();
      double y2 = src1.getMaxY();
      result = new Rectangle2D.Double();
      result.setFrameFromDiagonal(x1, y1, x2, y2);
    } else {
      // only src2 is non-null
      double x1 = src2.getMinX();
      double y1 = src2.getMinY();
      double x2 = src2.getMaxX();
      double y2 = src2.getMaxY();
      result = new Rectangle2D.Double();
      result.setFrameFromDiagonal(x1, y1, x2, y2);
    }
    return result;
  }
}

   
    
    
    
    
  

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