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/curve/b2dbeziertools.hxx>
      21             : #include <basegfx/curve/b2dcubicbezier.hxx>
      22             : #include <algorithm>
      23             : 
      24             : //////////////////////////////////////////////////////////////////////////////
      25             : 
      26             : namespace basegfx
      27             : {
      28           0 :     B2DCubicBezierHelper::B2DCubicBezierHelper(const B2DCubicBezier& rBase, sal_uInt32 nDivisions)
      29             :     :   maLengthArray(),
      30           0 :         mnEdgeCount(0)
      31             :     {
      32           0 :         const bool bIsBezier(rBase.isBezier());
      33             : 
      34           0 :         if(bIsBezier)
      35             :         {
      36             :             // check nDivisions; at least one is needed, but also prevent too big values
      37           0 :             if(nDivisions < 1)
      38             :             {
      39           0 :                 nDivisions = 1;
      40             :             }
      41           0 :             else if(nDivisions > 1000)
      42             :             {
      43           0 :                 nDivisions = 1000;
      44             :             }
      45             : 
      46             :             // set nEdgeCount
      47           0 :             mnEdgeCount = nDivisions + 1;
      48             : 
      49             :             // fill in maLengthArray
      50           0 :             maLengthArray.clear();
      51           0 :             maLengthArray.reserve(mnEdgeCount);
      52           0 :             B2DPoint aCurrent(rBase.getStartPoint());
      53           0 :             double fLength(0.0);
      54             : 
      55           0 :             for(sal_uInt32 a(1);;)
      56             :             {
      57           0 :                 const B2DPoint aNext(rBase.interpolatePoint((double)a / (double)mnEdgeCount));
      58           0 :                 const B2DVector aEdge(aNext - aCurrent);
      59             : 
      60           0 :                 fLength += aEdge.getLength();
      61           0 :                 maLengthArray.push_back(fLength);
      62             : 
      63           0 :                 if(++a < mnEdgeCount)
      64             :                 {
      65           0 :                     aCurrent = aNext;
      66             :                 }
      67             :                 else
      68             :                 {
      69           0 :                     const B2DPoint aLastNext(rBase.getEndPoint());
      70           0 :                     const B2DVector aLastEdge(aLastNext - aNext);
      71             : 
      72           0 :                     fLength += aLastEdge.getLength();
      73           0 :                     maLengthArray.push_back(fLength);
      74           0 :                     break;
      75             :                 }
      76           0 :             }
      77             :         }
      78             :         else
      79             :         {
      80           0 :             maLengthArray.clear();
      81           0 :             maLengthArray.push_back(rBase.getEdgeLength());
      82           0 :             mnEdgeCount = 1;
      83             :         }
      84           0 :     }
      85             : 
      86           0 :     double B2DCubicBezierHelper::distanceToRelative(double fDistance) const
      87             :     {
      88           0 :         if(fDistance <= 0.0)
      89             :         {
      90           0 :             return 0.0;
      91             :         }
      92             : 
      93           0 :         const double fLength(getLength());
      94             : 
      95           0 :         if(fTools::moreOrEqual(fDistance, fLength))
      96             :         {
      97           0 :             return 1.0;
      98             :         }
      99             : 
     100             :         // fDistance is in ]0.0 .. fLength[
     101             : 
     102           0 :         if(1 == mnEdgeCount)
     103             :         {
     104             :             // not a bezier, linear edge
     105           0 :             return fDistance / fLength;
     106             :         }
     107             : 
     108             :         // it is a bezier
     109           0 :         ::std::vector< double >::const_iterator aIter = ::std::lower_bound(maLengthArray.begin(), maLengthArray.end(), fDistance);
     110           0 :         const sal_uInt32 nIndex(aIter - maLengthArray.begin());
     111           0 :         const double fHighBound(maLengthArray[nIndex]);
     112           0 :         const double fLowBound(nIndex ?  maLengthArray[nIndex - 1] : 0.0);
     113           0 :         const double fLinearInterpolatedLength((fDistance - fLowBound) / (fHighBound - fLowBound));
     114             : 
     115           0 :         return (static_cast< double >(nIndex) + fLinearInterpolatedLength) / static_cast< double >(mnEdgeCount);
     116             :     }
     117             : 
     118             : } // end of namespace basegfx
     119             : 
     120             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */