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 <numeric>
  21
  22 #include <tools/gen.hxx>
  23 #include <basegfx/numeric/ftools.hxx>
  24
  25 void Point::RotateAround( long& rX, long& rY,
  26                           short nOrientation ) const
  27 {
  28     const long nOriginX = X();
  29     const long nOriginY = Y();
  30
  31     if ( (nOrientation >= 0) && !(nOrientation % 900) )
  32     {
  33         if ( (nOrientation >= 3600) )
  34             nOrientation %= 3600;
  35
  36         if ( nOrientation )
  37         {
  38             rX -= nOriginX;
  39             rY -= nOriginY;
  40
  41             if ( nOrientation == 900 )
  42             {
  43                 long nTemp = rX;
  44                 rX = rY;
  45                 rY = -nTemp;
  46             }
  47             else if ( nOrientation == 1800 )
  48             {
  49                 rX = -rX;
  50                 rY = -rY;
  51             }
  52             else /* ( nOrientation == 2700 ) */
  53             {
  54                 long nTemp = rX;
  55                 rX = -rY;
  56                 rY = nTemp;
  57             }
  58
  59             rX += nOriginX;
  60             rY += nOriginY;
  61         }
  62     }
  63     else
  64     {
  65         double nRealOrientation = nOrientation*F_PI1800;
  66         double nCos = cos( nRealOrientation );
  67         double nSin = sin( nRealOrientation );
  68
  69         // Translation...
  70         long nX = rX-nOriginX;
  71         long nY = rY-nOriginY;
  72
  73         // Rotation...
  74         rX = +((long)(nCos*nX + nSin*nY)) + nOriginX;
  75         rY = -((long)(nSin*nX - nCos*nY)) + nOriginY;
  76     }
  77 }
  78
  79 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */