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koffice/karbon/commands/vbooleancmd.cc

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/* This file is part of the KDE project
Copyright (C) 2001, The Karbon Developers
Copyright (C) 2002, The Karbon Developers
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <qptrlist.h>
#include <qvaluelist.h>
#include <klocale.h>
#include "vbooleancmd.h"
#include "vpath.h"
#include "vsegment.h"
#include "vselection.h"
#include "vdocument.h"
VBooleanCmd::VBooleanCmd( VDocument *doc, VBooleanType type )
: VCommand( doc, i18n( "Boolean Operation" ) )
{
m_selection = document()->selection()->clone();
m_type = type;
}
VBooleanCmd::~VBooleanCmd()
{
delete( m_selection );
}
void
VBooleanCmd::execute()
{
VObjectListIterator itr( m_selection->objects() );
for ( ; itr.current() ; ++itr )
{
// TODO: pair wise visiting.
}
// document()->append( );
document()->selection()->clear();
}
void
VBooleanCmd::unexecute()
{
}
bool
VBooleanCmd::visit( VObject& object1, VObject& object2 )
{
m_path1 = 0L;
m_path2 = 0L;
object1.accept( *this );
object2.accept( *this );
return success();
}
void
VBooleanCmd::visitVSubpath( VSubpath& path )
{
if( m_path1 == 0L )
m_path1 = &path;
else if( m_path2 == 0L )
{
m_path2 = &path;
// intersection parameters (t):
VParamList params1;
VParamList params2;
VParamList::iterator pItr;
double prevParam;
m_path1->first();
// ommit "begin" segment:
while( m_path1->next() )
{
params1.clear();
m_path2->first();
// ommit "begin" segment:
while( m_path2->next() )
{
params2.clear();
recursiveSubdivision(
*m_path1->current(), 0.0, 1.0,
*m_path2->current(), 0.0, 1.0,
params1, params2 );
qHeapSort( params2 );
prevParam = 0.0;
// walk down all intersection params and insert knots:
for( pItr = params2.begin(); pItr != params2.end(); ++pItr )
{
m_path2->insert(
m_path2->current()->splitAt(
( *pItr - prevParam )/( 1.0 - prevParam ) ) );
m_path2->next();
prevParam = *pItr;
}
}
qHeapSort( params1 );
prevParam = 0.0;
// walk down all intersection params and insert knots:
for( pItr = params1.begin(); pItr != params1.end(); ++pItr )
{
m_path1->insert(
m_path1->current()->splitAt(
( *pItr - prevParam )/( 1.0 - prevParam ) ) );
m_path1->next();
prevParam = *pItr;
}
}
}
}
void
VBooleanCmd::recursiveSubdivision(
const VSegment& segment1, double t0_1, double t1_1,
const VSegment& segment2, double t0_2, double t1_2,
VParamList& params1, VParamList& params2 )
{
if(
!segment1.boundingBox().intersects(
segment2.boundingBox() ) )
{
return;
}
if( segment1.isFlat() )
{
// calculate intersection of line segments:
if( segment2.isFlat() )
{
KoPoint v1 = segment1.knot() - segment1.prev()->knot();
KoPoint v2 = segment2.knot() - segment2.prev()->knot();
double det = v2.x() * v1.y() - v2.y() * v1.x();
if( 1.0 + det == 1.0 )
return;
else
{
KoPoint v = segment2.prev()->knot() - segment1.prev()->knot();
const double one_det = 1.0 / det;
double t1 = one_det * ( v2.x() * v.y() - v2.y() * v.x() );
double t2 = one_det * ( v1.x() * v.y() - v1.y() * v.x() );
if ( t1 < 0.0 || t1 > 1.0 || t2 < 0.0 || t2 > 1.0 )
return;
params1.append( t0_1 + t1 * ( t1_1 - t0_1 ) );
params2.append( t0_2 + t2 * ( t1_2 - t0_2 ) );
}
}
else
{
// "copy segment" and split it at midpoint:
VSubpath path2( segment2 );
path2.insert( path2.current()->splitAt( 0.5 ) );
double mid2 = 0.5 * ( t0_2 + t1_2 );
recursiveSubdivision(
*path2.current(), t0_2, mid2,
segment1, t0_1, t1_1, params2, params1 );
recursiveSubdivision(
*path2.next(), mid2, t1_2,
segment1, t0_1, t1_1, params2, params1 );
}
}
else
{
// "copy segment" and split it at midpoint:
VSubpath path1( segment1 );
path1.insert( path1.current()->splitAt( 0.5 ) );
double mid1 = 0.5 * ( t0_1 + t1_1 );
if( segment2.isFlat() )
{
recursiveSubdivision(
*path1.current(), t0_1, mid1,
segment2, t0_2, t1_2, params1, params2 );
recursiveSubdivision(
*path1.next(), mid1, t1_1,
segment2, t0_2, t1_2, params1, params2 );
}
else
{
// "copy segment" and split it at midpoint:
VSubpath path2( segment2 );
path2.insert( path2.current()->splitAt( 0.5 ) );
double mid2 = 0.5 * ( t0_2 + t1_2 );
recursiveSubdivision(
*path1.current(), t0_1, mid1,
*path2.current(), t0_2, mid2, params1, params2 );
recursiveSubdivision(
*path1.next(), mid1, t1_1,
*path2.current(), t0_2, mid2, params1, params2 );
recursiveSubdivision(
*path1.prev(), t0_1, mid1,
*path2.next(), mid2, t1_2, params1, params2 );
recursiveSubdivision(
*path1.next(), mid1, t1_1,
*path2.current(), mid2, t1_2, params1, params2 );
}
}
}