pdfedit-addscript/displayparams.h

   1 /*
   2  * PDFedit - free program for PDF document manipulation.
   3  * Copyright (C) 2006-2009  PDFedit team: Michal Hocko,
   4  *                                        Jozef Misutka,
   5  *                                        Martin Petricek
   6  *                   Former team members: Miroslav Jahoda
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program (in doc/LICENSE.GPL); if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA  02111-1307  USA
  21  *
  22  * Project is hosted on http://sourceforge.net/projects/pdfedit
  23  */
  24 // vim:tabstop=4:shiftwidth=4:noexpandtab:textwidth=80
  25
  26 #ifndef _DISPLAYPARAMS_H_
  27 #define _DISPLAYPARAMS_H_
  28
  29 // all basic includes
  30 #include "kernel/static.h"
  31
  32
  33 //=====================================================================================
  34 namespace pdfobjects {
  35 //=====================================================================================
  36
  37
  38 //=====================================================================================
  39 // Display parameters (loose xpdf parameters put into a simple structure)
  40 //      --  default values are in cpage.cc because we do not want to have global variables.
  41 //=====================================================================================
  42
  43 /**
  44  * Graphical state parameters.
  45  *
  46  * These parameters are used by xpdf when updating bounding boxex of content stream operators,
  47  * displaying page etc.
  48  */
  49 typedef struct DisplayParams
  50 {
  51         /** Paramaters */
  52         double          hDpi;           /**< Horizontal DPI. */
  53         double          vDpi;           /**< Vertical DPI.      */
  54         libs::Rectangle pageRect;/**< Page rectangle. */
  55         int             rotate;         /**< Page rotation.     */
  56         GBool           useMediaBox;/**< Use page media box. */
  57         GBool           crop;           /**< Crop the page.     */
  58         GBool           upsideDown;     /**< Upside down.       */
  59
  60         /** Constructor. Default values are set. */
  61         DisplayParams () :
  62                 hDpi (DEFAULT_HDPI), vDpi (DEFAULT_VDPI),
  63                 pageRect (libs::Rectangle (DEFAULT_PAGE_LX, DEFAULT_PAGE_LY, DEFAULT_PAGE_RX, DEFAULT_PAGE_RY)),
  64                 rotate (DEFAULT_ROTATE), useMediaBox (gTrue), crop (gFalse), upsideDown (gTrue)
  65                 {}
  66
  67
  68
  69         /** Equality operator. */
  70         bool operator== (const DisplayParams& dp) const
  71         {
  72                 return (hDpi == dp.hDpi && vDpi == dp.vDpi &&
  73                                 pageRect == dp.pageRect && rotate == dp.rotate &&
  74                                 useMediaBox == dp.useMediaBox && crop == dp.crop &&
  75                                 upsideDown == dp.upsideDown);
  76         }
  77
  78         /** Converting position from pixmap of viewed page to pdf position.
  79          * @param fromX X position on viewed page.
  80          * @param fromY Y position on viewed page.
  81          *
  82          * @param toX   return X position in pdf page.
  83          * @param toY   return Y position in pdf page.
  84          *
  85          * @see convertPdfPosToPixmapPos
  86          */
  87         void convertPixmapPosToPdfPos( double fromX, double fromY, double & toX, double & toY ) const {
  88                 const double * ctm /*[6]*/;
  89                 double h;
  90                 PDFRectangle pdfRect ( pageRect.xleft, pageRect.yleft, pageRect.xright, pageRect.yright );
  91                 GfxState state (hDpi, vDpi, &pdfRect, rotate, upsideDown );
  92                 ctm = state.getCTM();
  93
  94                 h = (ctm[0]*ctm[3] - ctm[1]*ctm[2]);
  95
  96                 assert( h != 0 );
  97
  98                 toX = (fromX*ctm[3] - ctm[2]*fromY + ctm[2]*ctm[5] - ctm[4]*ctm[3]) / h;
  99                 toY = (ctm[0]*fromY + ctm[1]*ctm[4] - ctm[0]*ctm[5] - ctm[1]*fromX) / h;
 100         }
 101
 102         /** Converting pdf position to position on pixmap of viewed page.
 103          * @param fromX X position in pdf page.
 104          * @param fromY Y position in pdf page.
 105          *
 106          * @param toX   return X position on viewed page.
 107          * @param toY   return Y position on viewed page.
 108          *
 109          * @see convertPixmapPosToPdfPos
 110          */
 111         void convertPdfPosToPixmapPos( double fromX, double fromY, double & toX, double & toY ) const {
 112                 PDFRectangle pdfRect ( pageRect.xleft, pageRect.yleft, pageRect.xright, pageRect.yright );
 113                 GfxState state (hDpi, vDpi, &pdfRect, rotate, upsideDown );
 114
 115                 state.transform( fromX, fromY, &toX, &toY );
 116         }
 117
 118         //
 119         // Default values
 120         // -- small hack to declare them as ints, to be able to init
 121         // them here (if double, we could not init them here because of the non
 122         // integral type compilator error))
 123         //
 124         static const int DEFAULT_HDPI   = 72;           /**< Default horizontal dpi. */
 125         static const int DEFAULT_VDPI   = 72;           /**< Default vertical dpi. */
 126         static const int DEFAULT_ROTATE = 0;            /**< No rotatation. */
 127
 128         static const int DEFAULT_PAGE_LX = 0;           /**< Default x position of left upper corner. */
 129         static const int DEFAULT_PAGE_LY = 0;           /**< Default y position of right upper corner. */
 130         static const int DEFAULT_PAGE_RX = 1584;                /**< Default A4 width on a device with 72 horizontal dpi. */
 131         static const int DEFAULT_PAGE_RY = 1584;                /**< Default A4 height on a device with 72 vertical dpi. */
 132
 133 } DisplayParams;
 134
 135
 136 //=====================================================================================
 137 } // namespace pdfobjects
 138 //=====================================================================================
 139
 140
 141 #endif // _DISPLAYPARAMS_H_