kig/objects/special_calcers.cc

   1 // Copyright (C)  2004  Dominique Devriese <devriese@kde.org>
   2
   3 // This program is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU General Public License
   5 // as published by the Free Software Foundation; either version 2
   6 // of the License, or (at your option) any later version.
   7
   8 // This program is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  16 // 02111-1307, USA.
  17
  18 #include "special_calcers.h"
  19
  20 static const ArgsParser::spec argsspecMeasureTransport[] =
  21 {
  22   { CircleImp::stype(), I18N_NOOP( "Transport a measure on this circle" ) },
  23   { PointImp::stype(), I18N_NOOP( "Project this point onto the circle" ) },
  24   { SegmentImp::stype(), I18N_NOOP( "Segment to transport" ) }
  25 };
  26
  27 static ArgsParser measuretransportargsparser( argsspecMeasureTransport, 3 );
  28
  29 std::vector<ObjectCalcer*> MeasureTransportCalcer::parents() const
  30 {
  31   std::vector<ObjectCalcer*> ret;
  32   ret.push_back( mcircle );
  33   ret.push_back( mpoint );
  34   ret.push_back( msegment );
  35   return ret;
  36 }
  37
  38 MeasureTransportCalcer::MeasureTransportCalcer(ObjectCalcer* circle, ObjectCalcer* point, ObjectCalcer* segment )
  39   : mcircle( circle ), mpoint( point ), msegment( segment ), mimp( 0 )
  40 {
  41 }
  42
  43 MeasureTransportCalcer::~MeasureTransportCalcer()
  44 {
  45 }
  46
  47 void MeasureTransportCalcer::calc( const KigDocument& )
  48 {
  49   if ( ! measuretransportargsparser.checkArgs( parents() ) )
  50     return new InvalidImp();
  51
  52   if ( ! isPointOnCurve( mpoint, mcircle ) )
  53     return new InvalidImp();
  54
  55   const CircleImp* c = static_cast<const CircleImp*>( mcircle->imp() );
  56   const PointImp* p = static_cast<const PointImp*>( mpoint->imp() );
  57   const SegmentImp* s = static_cast<const SegmentImp*>( msegment->imp() );
  58   double param = c->getParam( p->coordinate(), doc );
  59   double measure = s->length();
  60   measure /= 2*c->radius()*M_PI;
  61   param += measure;
  62   while (param > 1) param -= 1;
  63
  64   const Coordinate nc = c->getPoint( param, doc );
  65   if ( nc.valid() ) return new PointImp( nc );
  66   else return new InvalidImp;
  67 }
  68
  69 const ObjectImpType* MeasureTransportCalcer::impRequirement(
  70   ObjectCalcer* o, const std::vector<ObjectCalcer*>& os ) const
  71 {
  72   if ( o->imp()->inherits( CircleImp::stype() ) )
  73     return CircleImp::stype();
  74   else if ( o->imp()->inherits( PointImp::stype() ) )
  75     return PointImp::stype();
  76   else if ( o->imp()->inherits( SegmentImp::stype() ) )
  77     return SegmentImp::stype();
  78   else
  79   {
  80     assert( false );
  81     return 0;
  82   }
  83 }
  84