sc/source/ui/view/drawutil.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <vcl/outdev.hxx>
  21
  22 #include "drawutil.hxx"
  23 #include "document.hxx"
  24 #include "global.hxx"
  25 #include "viewdata.hxx"
  26
  27 void ScDrawUtil::CalcScale( ScDocument* pDoc, SCTAB nTab,
  28                             SCCOL nStartCol, SCROW nStartRow, SCCOL nEndCol, SCROW nEndRow,
  29                             OutputDevice* pDev,
  30                             const Fraction& rZoomX, const Fraction& rZoomY,
  31                             double nPPTX, double nPPTY,
  32                             Fraction& rScaleX, Fraction& rScaleY )
  33 {
  34     long nPixelX = 0;
  35     long nTwipsX = 0;
  36     long nPixelY = 0;
  37     long nTwipsY = 0;
  38     for (SCCOL i=nStartCol; i<nEndCol; i++)
  39     {
  40         sal_uInt16 nWidth = pDoc->GetColWidth(i,nTab);
  41         nTwipsX += (long) nWidth;
  42         nPixelX += ScViewData::ToPixel( nWidth, nPPTX );
  43     }
  44
  45     for (SCROW nRow = nStartRow; nRow <= nEndRow-1; ++nRow)
  46     {
  47         SCROW nLastRow = nRow;
  48         if (pDoc->RowHidden(nRow, nTab, NULL, &nLastRow))
  49         {
  50             nRow = nLastRow;
  51             continue;
  52         }
  53
  54         sal_uInt16 nHeight = pDoc->GetRowHeight(nRow, nTab);
  55         nTwipsY += static_cast<long>(nHeight);
  56         nPixelY += ScViewData::ToPixel(nHeight, nPPTY);
  57     }
  58
  59     MapMode aHMMMode( MAP_100TH_MM, Point(), rZoomX, rZoomY );
  60     Point aPixelLog = pDev->PixelToLogic( Point( nPixelX,nPixelY ), aHMMMode );
  61
  62     //  Fraction(double) ctor can be used here (and avoid overflows of PixelLog * Zoom)
  63     //  because ReduceInaccurate is called later anyway.
  64
  65     if ( aPixelLog.X() && nTwipsX )
  66         rScaleX = Fraction( ((double)aPixelLog.X()) *
  67                             ((double)rZoomX.GetNumerator()) /
  68                             ((double)nTwipsX) /
  69                             ((double)HMM_PER_TWIPS) /
  70                             ((double)rZoomX.GetDenominator()) );
  71     else
  72         rScaleX = Fraction( 1, 1 );
  73
  74     if ( aPixelLog.Y() && nTwipsY )
  75         rScaleY = Fraction( ((double)aPixelLog.Y()) *
  76                             ((double)rZoomY.GetNumerator()) /
  77                             ((double)nTwipsY) /
  78                             ((double)HMM_PER_TWIPS) /
  79                             ((double)rZoomY.GetDenominator()) );
  80     else
  81         rScaleY = Fraction( 1, 1 );
  82
  83     //  25 bits of accuracy are needed to always hit the right part of
  84     //  cells in the last rows (was 17 before 1M rows).
  85     rScaleX.ReduceInaccurate( 25 );
  86     rScaleY.ReduceInaccurate( 25 );
  87 }
  88
  89 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */