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GRect.h

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//C-  -*- C++ -*-
//C- -------------------------------------------------------------------
//C- DjVuLibre-3.5
//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001  AT&T
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, Version 2. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- This program is distributed in the hope that it will be useful,
//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//C- GNU General Public License for more details.
//C- 
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
//C- distributed by Lizardtech Software.  On July 19th 2002, Lizardtech 
//C- Software authorized us to replace the original DjVu(r) Reference 
//C- Library notice by the following text (see doc/lizard2002.djvu):
//C-
//C-  ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, Version 2. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE."  Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 
//C- | non-exclusive license to make, use, sell, or otherwise dispose of 
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 
//C- | General Public License.   This grant only confers the right to 
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 
//C- | the extent such infringement is reasonably necessary to enable 
//C- | recipient to make, have made, practice, sell, or otherwise dispose 
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 
//C- | any greater extent that may be necessary to utilize further 
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
// 
// $Id: GRect.h,v 1.9 2003/11/07 22:08:21 leonb Exp $
// $Name: release_3_5_15 $

#ifndef _GRECT_H_
#define _GRECT_H_
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma interface
#endif



#include "DjVuGlobal.h"

#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif







class GRect 
{
public:
  enum OrientationBits
  {
    BOTTOM_UP=0x1,  /* Upside down */
    MIRROR=0x2,     /* Written backwards. (right to left) */
    ROTATE90_CW=0x4 /* rotated 90 degrees */
  };

  enum Orientations
  {
    TDLRNR=0,                                     /* normal orientation */
    BULRNR=BOTTOM_UP,                               /* upside down */
    TDRLNR=MIRROR,                    /* backwards (right to left) */
    BURLNR=MIRROR|BOTTOM_UP,                    /* rotate 180 */
    TDLRCW=ROTATE90_CW,                              /* rotated 90 */
    BULRCW=ROTATE90_CW|BOTTOM_UP, /* backwards and rotate 180 */
    TDRLCW=ROTATE90_CW|MIRROR,     /* backwards and rotate 90 */
    BURLCW=ROTATE90_CW|MIRROR|BOTTOM_UP    /* rotate 270 */
  };

  static Orientations
  rotate(const int angle,Orientations orientation)
  {
    for(int a=(((angle)%360)+405)%360;a>90;a-=90)
      orientation=(Orientations)((int)orientation^(int)(orientation&ROTATE90_CW)?BURLCW:TDLRCW);
    return orientation;
  }

  static int
  findangle(const Orientations orientation)
  {
    int a=270;
    while(a&&(rotate(a,BURLNR)!=orientation)&&(rotate(a,TDRLNR)!=orientation))
      a-=90;
    return a;
  }

  GRect();
  GRect(int xmin, int ymin, unsigned int width=0, unsigned int height=0);
  int  width() const;
  int  height() const;
  int  area() const;
  int  isempty() const;
  int  contains(int x, int y) const;
  int  contains(const GRect & rect) const;
  friend int operator==(const GRect & r1, const GRect & r2);
  friend int operator!=(const GRect & r1, const GRect & r2);
  void clear();
  int  inflate(int dx, int dy);
  int  translate(int dx, int dy);
  int  intersect(const GRect &rect1, const GRect &rect2);
  int  recthull(const GRect &rect1, const GRect &rect2);
  void scale(float factor);
  void scale(float xfactor, float yfactor);
  int xmin;
  int ymin;
  int xmax;
  int ymax;
};


class GRectMapper 
{
public:
  GRectMapper();
  void clear();
  void set_input(const GRect &rect);
  GRect get_input();
  void set_output(const GRect &rect);
  GRect get_output();
  void rotate(int count=1);
  void mirrorx();
  void mirrory();
  void map(int &x, int &y);
  void map(GRect &rect);
  void unmap(int &x, int &y);
  void unmap(GRect &rect);
private:
  // GRatio
  struct GRatio {
    GRatio ();
    GRatio (int p, int q);
    int p;
    int q;
  };
  // Data
  GRect rectFrom;
  GRect rectTo;
  int   code;
  // Helper
  void  precalc();
  friend int operator*(int n, GRatio r ); 
  friend int operator/(int n, GRatio r ); 
  GRatio rw;
  GRatio rh;
};





// ---- INLINES

inline
GRect::GRect()
: xmin(0), ymin(0), xmax(0), ymax(0)
{
}

inline 
GRect::GRect(int xmin, int ymin, unsigned int width, unsigned int height)
: xmin(xmin), ymin(ymin), xmax(xmin+width), ymax(ymin+height)
{
}

inline int 
GRect::width() const
{
  return xmax - xmin;
}

inline int 
GRect::height() const
{
  return ymax - ymin;
}

inline int 
GRect::isempty() const
{
  return (xmin>=xmax || ymin>=ymax);
}

inline int 
GRect::area() const
{
  return isempty() ? 0 : (xmax-xmin)*(ymax-ymin);
}

inline int
GRect::contains(int x, int y) const
{
  return (x>=xmin && x<xmax && y>=ymin && y<ymax);
}
  
inline void 
GRect::clear()
{
  xmin = xmax = ymin = ymax = 0;
}

inline int
operator!=(const GRect & r1, const GRect & r2)
{
   return !(r1==r2);
}

// ---- THE END

#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif
#endif

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