Line data    Source code

       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 <basegfx/numeric/ftools.hxx>
      21             : #include <algorithm>
      22             : 
      23             : namespace basegfx
      24             : {
      25             :     // init static member of class fTools
      26             :     double ::basegfx::fTools::mfSmallValue = 0.000000001;
      27             : 
      28           0 :     double snapToNearestMultiple(double v, const double fStep)
      29             :     {
      30           0 :         if(fTools::equalZero(fStep))
      31             :         {
      32             :             // with a zero step, all snaps to 0.0
      33           0 :             return 0.0;
      34             :         }
      35             :         else
      36             :         {
      37           0 :             const double fHalfStep(fStep * 0.5);
      38           0 :             const double fChange(fHalfStep - fmod(v + fHalfStep, fStep));
      39             : 
      40           0 :             if(basegfx::fTools::equal(fabs(v), fabs(fChange)))
      41             :             {
      42           0 :                 return 0.0;
      43             :             }
      44             :             else
      45             :             {
      46           0 :                 return v + fChange;
      47             :             }
      48             :         }
      49             :     }
      50             : 
      51           0 :     double snapToZeroRange(double v, double fWidth)
      52             :     {
      53           0 :         if(fTools::equalZero(fWidth))
      54             :         {
      55             :             // with no range all snaps to range bound
      56           0 :             return 0.0;
      57             :         }
      58             :         else
      59             :         {
      60           0 :             if(v < 0.0 || v > fWidth)
      61             :             {
      62           0 :                 double fRetval(fmod(v, fWidth));
      63             : 
      64           0 :                 if(fRetval < 0.0)
      65             :                 {
      66           0 :                     fRetval += fWidth;
      67             :                 }
      68             : 
      69           0 :                 return fRetval;
      70             :             }
      71             :             else
      72             :             {
      73           0 :                 return v;
      74             :             }
      75             :         }
      76             :     }
      77             : 
      78           0 :     double snapToRange(double v, double fLow, double fHigh)
      79             :     {
      80           0 :         if(fTools::equal(fLow, fHigh))
      81             :         {
      82             :             // with no range all snaps to range bound
      83           0 :             return 0.0;
      84             :         }
      85             :         else
      86             :         {
      87           0 :             if(fLow > fHigh)
      88             :             {
      89             :                 // correct range order. Evtl. assert this (?)
      90           0 :                 std::swap(fLow, fHigh);
      91             :             }
      92             : 
      93           0 :             if(v < fLow || v > fHigh)
      94             :             {
      95           0 :                 return snapToZeroRange(v - fLow, fHigh - fLow) + fLow;
      96             :             }
      97             :             else
      98             :             {
      99           0 :                 return v;
     100             :             }
     101             :         }
     102             :     }
     103             : } // end of namespace basegfx
     104             : 
     105             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */