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The Adobe Experience Manager SDK
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/*
*
*	File: Rect.java
*
*
*	ADOBE CONFIDENTIAL
*	___________________
*
*	Copyright 2004-2005 Adobe Systems Incorporated
*	All Rights Reserved.
*
*	NOTICE: All information contained herein is, and remains the property of
*	Adobe Systems Incorporated and its suppliers, if any. The intellectual
*	and technical concepts contained herein are proprietary to Adobe Systems
*	Incorporated and its suppliers and may be covered by U.S. and Foreign
*	Patents, patents in process, and are protected by trade secret or
*	copyright law. Dissemination of this information or reproduction of this
*	material is strictly forbidden unless prior written permission is obtained
*	from Adobe Systems Incorporated.
*
*/
package com.adobe.fontengine.font;

/** A bounding box.
 * 
 * AFE's coordinates are in y-positive.
 * Values are: xmin, ymin, xmax, ymax where xmin <= xmax and ymin <= ymax.
 * 
 * 
Synchronization
 * 
 * These objects are immutable.
 */

final public class Rect {
  public final double xmin;
  public final double ymin;
  public final double xmax;
  public final double ymax;
  
  /** A rectangle with xmin = ymin = xmax = ymax = 0. */
  public static final Rect emptyRect = new Rect (0.0d, 0.0d, 0.0d, 0.0d);
  
  public Rect (double xmin, double ymin, double xmax, double ymax) {
    this.xmin = xmin;
    this.ymin = ymin;
    this.xmax = xmax;
    this.ymax = ymax;
  }
  
  /**
   * Create a Rect from an array of doubles.
   * @param vals An array of length 4 whose entries are in the order xmin, ymin, xmax, ymax.
   */
  public Rect(double[] vals) {
      this.xmin = vals[0];
      this.ymin = vals[1];
      this.xmax = vals[2];
      this.ymax = vals[3];
  }
  
  /**
   * Convert this Rect through a matrix.
   * @param m the matrix
   * @return the transformed bounding box
   */
  public Rect applyMatrix (Matrix m) {
 	  if (m.isIdentity ()) {
 	  	return this; }
 	  
  	double tlX, tlY, trX, trY, brX, brY, blX, blY;
  	
  	tlX = m.applyToXYGetX (xmin, ymax);
  	tlY = m.applyToXYGetY (xmin, ymax);
  	trX = m.applyToXYGetX (xmax, ymax);
  	trY = m.applyToXYGetY (xmax, ymax);
  	brX = m.applyToXYGetX (xmax, ymin);
  	brY = m.applyToXYGetY (xmax, ymin);
  	blX = m.applyToXYGetX (xmin, ymin);
  	blY = m.applyToXYGetY (xmin, ymin);
  	
  	return new Rect (
  			Math.min (Math.min (tlX, trX), Math.min (brX, blX)),
				Math.min (Math.min (tlY, trY), Math.min (brY, blY)),
				Math.max (Math.max (tlX, trX), Math.max (brX, blX)),
				Math.max (Math.max (tlY, trY), Math.max (brY, blY)));
  }

  
  public Rect toEmSpace (double unitsPerEmX, double unitsPerEmY) {
  	return new Rect (xmin / unitsPerEmX, ymin / unitsPerEmY,
  			             xmax / unitsPerEmX, ymax / unitsPerEmY);
  }
  

  public Rect toDesignSpace (double unitsPerEmX, double unitsPerEmY) {
  	return new Rect (xmin * unitsPerEmX, ymin * unitsPerEmY,
  			             xmax * unitsPerEmX, ymax * unitsPerEmY);
  }
  

  public String toString() {
  	return "[ " + Double.toString(xmin) + " " + Double.toString(ymin) + " "
		            + Double.toString(xmax) + " " + Double.toString(ymax) + " ]";
  }
  
  public boolean equals (Object obj) {
    if (obj != null) {
      if (this == obj) {
        return true; }
      else if (obj instanceof Rect) {
        Rect r = (Rect) obj;
        return (   Double.compare (xmin, r.xmin) == 0
                && Double.compare (ymin, r.ymin) == 0
                && Double.compare (xmax, r.xmax) == 0
                && Double.compare (ymax, r.ymax) == 0); }}
    return false;
  }
  
  
  public int hashCode() {
    return (int)xmin ^ (int)xmax ^ (int)ymin ^ (int)ymax;
  }
}