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 #include <basegfx/numeric/ftools.hxx>
  22
  23 void Point::RotateAround( Point& rPoint,
  24                           short nOrientation ) const
  25 {
  26     long nX = rPoint.X();
  27     long nY = rPoint.Y();
  28     RotateAround(nX, nY, nOrientation);
  29     rPoint.setX(nX);
  30     rPoint.setY(nY);
  31 }
  32
  33 void Point::RotateAround( long& rX, long& rY,
  34                           short nOrientation ) const
  35 {
  36     const long nOriginX = X();
  37     const long nOriginY = Y();
  38
  39     if ( (nOrientation >= 0) && !(nOrientation % 900) )
  40     {
  41         if ( nOrientation >= 3600 )
  42             nOrientation %= 3600;
  43
  44         if ( nOrientation )
  45         {
  46             rX -= nOriginX;
  47             rY -= nOriginY;
  48
  49             if ( nOrientation == 900 )
  50             {
  51                 long nTemp = rX;
  52                 rX = rY;
  53                 rY = -nTemp;
  54             }
  55             else if ( nOrientation == 1800 )
  56             {
  57                 rX = -rX;
  58                 rY = -rY;
  59             }
  60             else /* ( nOrientation == 2700 ) */
  61             {
  62                 long nTemp = rX;
  63                 rX = -rY;
  64                 rY = nTemp;
  65             }
  66
  67             rX += nOriginX;
  68             rY += nOriginY;
  69         }
  70     }
  71     else
  72     {
  73         double nRealOrientation = nOrientation*F_PI1800;
  74         double nCos = cos( nRealOrientation );
  75         double nSin = sin( nRealOrientation );
  76
  77         // Translation...
  78         long nX = rX-nOriginX;
  79         long nY = rY-nOriginY;
  80
  81         // Rotation...
  82         rX = + static_cast<long>(nCos*nX + nSin*nY) + nOriginX;
  83         rY = - static_cast<long>(nSin*nX - nCos*nY) + nOriginY;
  84     }
  85 }
  86
  87 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */