tools/source/generic/point.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 <tools/gen.hxx>
  21
  22 void PointTemplateBase::RotateAround( PointTemplateBase& rPoint,
  23                           Degree10 nOrientation ) const
  24 {
  25     tools::Long nX = rPoint.mnA;
  26     tools::Long nY = rPoint.mnB;
  27     RotateAround(nX, nY, nOrientation);
  28     rPoint.mnA = nX;
  29     rPoint.mnB = nY;
  30 }
  31
  32 void PointTemplateBase::RotateAround( tools::Long& rX, tools::Long& rY,
  33                           Degree10 nOrientation ) const
  34 {
  35     const tools::Long nOriginX = mnA;
  36     const tools::Long nOriginY = mnB;
  37
  38     if ( (nOrientation >= 0_deg10) && !(nOrientation % 900_deg10) )
  39     {
  40         if ( nOrientation >= 3600_deg10 )
  41             nOrientation %= 3600_deg10;
  42
  43         if ( nOrientation )
  44         {
  45             rX -= nOriginX;
  46             rY -= nOriginY;
  47
  48             if ( nOrientation == 900_deg10 )
  49             {
  50                 tools::Long nTemp = rX;
  51                 rX = rY;
  52                 rY = -nTemp;
  53             }
  54             else if ( nOrientation == 1800_deg10 )
  55             {
  56                 rX = -rX;
  57                 rY = -rY;
  58             }
  59             else /* ( nOrientation == 2700 ) */
  60             {
  61                 tools::Long nTemp = rX;
  62                 rX = -rY;
  63                 rY = nTemp;
  64             }
  65
  66             rX += nOriginX;
  67             rY += nOriginY;
  68         }
  69     }
  70     else
  71     {
  72         double nRealOrientation = toRadians(nOrientation);
  73         double nCos = cos( nRealOrientation );
  74         double nSin = sin( nRealOrientation );
  75
  76         // Translation...
  77         tools::Long nX = rX-nOriginX;
  78         tools::Long nY = rY-nOriginY;
  79
  80         // Rotation...
  81         rX = + static_cast<tools::Long>(nCos*nX + nSin*nY) + nOriginX;
  82         rY = - static_cast<tools::Long>(nSin*nX - nCos*nY) + nOriginY;
  83     }
  84 }
  85
  86 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */