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 <tools/link.hxx>
      21             : #include <tools/line.hxx>
      22             : #include <tools/helpers.hxx>
      23             : 
      24             : #include <cstdlib>
      25             : #include <math.h>
      26             : 
      27           0 : double Line::GetLength() const
      28             : {
      29           0 :     return hypot( maStart.X() - maEnd.X(), maStart.Y() - maEnd.Y() );
      30             : }
      31             : 
      32           0 : bool Line::Intersection( const Line& rLine, Point& rIntersection ) const
      33             : {
      34             :     double  fX, fY;
      35             :     bool    bRet;
      36             : 
      37           0 :     if( Intersection( rLine, fX, fY ) )
      38             :     {
      39           0 :         rIntersection.X() = FRound( fX );
      40           0 :         rIntersection.Y() = FRound( fY );
      41           0 :         bRet = true;
      42             :     }
      43             :     else
      44           0 :         bRet = false;
      45             : 
      46           0 :     return bRet;
      47             : }
      48             : 
      49       42060 : bool Line::Intersection( const Line& rLine, double& rIntersectionX, double& rIntersectionY ) const
      50             : {
      51       42060 :     const double    fAx = maEnd.X() - maStart.X();
      52       42060 :     const double    fAy = maEnd.Y() - maStart.Y();
      53       42060 :     const double    fBx = rLine.maStart.X() - rLine.maEnd.X();
      54       42060 :     const double    fBy = rLine.maStart.Y() - rLine.maEnd.Y();
      55       42060 :     const double    fDen = fAy * fBx - fAx * fBy;
      56       42060 :     bool            bOk = false;
      57             : 
      58       42060 :     if( fDen != 0. )
      59             :     {
      60       22000 :         const double    fCx = maStart.X() - rLine.maStart.X();
      61       22000 :         const double    fCy = maStart.Y() - rLine.maStart.Y();
      62       22000 :         const double    fA = fBy * fCx - fBx * fCy;
      63       22000 :         const bool      bGreater = ( fDen > 0. );
      64             : 
      65       22000 :         bOk = true;
      66             : 
      67       22000 :         if ( bGreater )
      68             :         {
      69       11000 :             if ( ( fA < 0. ) || ( fA > fDen ) )
      70         296 :                 bOk = false;
      71             :         }
      72       11000 :         else if ( ( fA > 0. ) || ( fA < fDen ) )
      73         296 :             bOk = false;
      74             : 
      75       22000 :         if ( bOk )
      76             :         {
      77       21408 :             const double fB = fAx * fCy - fAy * fCx;
      78             : 
      79       21408 :             if ( bGreater )
      80             :             {
      81       10704 :                 if ( ( fB < 0. ) || ( fB > fDen ) )
      82         770 :                     bOk = false;
      83             :             }
      84       10704 :             else if ( ( fB > 0. ) || ( fB < fDen ) )
      85         778 :                 bOk = false;
      86             : 
      87       21408 :             if( bOk )
      88             :             {
      89       19860 :                 const double fAlpha = fA / fDen;
      90             : 
      91       19860 :                 rIntersectionX = ( maStart.X() + fAlpha * fAx );
      92       19860 :                 rIntersectionY = ( maStart.Y() + fAlpha * fAy );
      93             :             }
      94             :         }
      95             :     }
      96             : 
      97       42060 :     return bOk;
      98             : }
      99             : 
     100         232 : double Line::GetDistance( const double& rPtX, const double& rPtY ) const
     101             : {
     102             :     double fDist;
     103             : 
     104         232 :     if( maStart != maEnd )
     105             :     {
     106         232 :         const double    fDistX = maEnd.X() - maStart.X();
     107         232 :         const double    fDistY = maEnd.Y() - maStart.Y();
     108         232 :         const double    fACX = maStart.X() - rPtX;
     109         232 :         const double    fACY = maStart.Y() - rPtY;
     110         232 :         const double    fL2 = fDistX * fDistX + fDistY * fDistY;
     111         232 :         const double    fR = ( fACY * -fDistY - fACX * fDistX ) / fL2;
     112         232 :         const double    fS = ( fACY * fDistX - fACX * fDistY ) / fL2;
     113             : 
     114         232 :         if( fR < 0.0 )
     115             :         {
     116           0 :             fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
     117             : 
     118           0 :             if( fS < 0.0 )
     119           0 :                 fDist *= -1.0;
     120             :         }
     121         232 :         else if( fR <= 1.0 )
     122         232 :             fDist = fS * sqrt( fL2 );
     123             :         else
     124             :         {
     125           0 :             fDist = hypot( maEnd.X() - rPtX, maEnd.Y() - rPtY );
     126             : 
     127           0 :             if( fS < 0.0 )
     128           0 :                 fDist *= -1.0;
     129             :         }
     130             :     }
     131             :     else
     132           0 :         fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
     133             : 
     134         232 :     return fDist;
     135             : }
     136             : 
     137             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */