whirlpinchplugin.cpp

/* This file is part of the KDE project
   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 <core/vselection.h>
#include "whirlpinchplugin.h"
#include <karbon_view.h>
#include <karbon_part.h>
#include <kgenericfactory.h>
#include <core/vdocument.h>
#include <core/vcomposite.h>
#include <core/vpath.h>
#include <core/vsegment.h>
#include <core/vglobal.h>
 
#include <kdebug.h>
 
#include <tqgroupbox.h>
#include <tqlabel.h>
 
#include <knuminput.h>
 
typedef KGenericFactory<WhirlPinchPlugin, KarbonView> WhirlPinchPluginFactory;
K_EXPORT_COMPONENT_FACTORY( karbon_whirlpinchplugin, WhirlPinchPluginFactory( "karbonwhirlpinchplugin" ) )
 
WhirlPinchPlugin::WhirlPinchPlugin( KarbonView *parent, const char* name, const TQStringList & ) : Plugin( parent, name )
{
    new TDEAction(
        i18n( "&Whirl/Pinch..." ), "14_whirl", 0, this,
        TQ_SLOT( slotWhirlPinch() ), actionCollection(), "path_whirlpinch" );
 
    m_whirlPinchDlg = new VWhirlPinchDlg();
    m_whirlPinchDlg->setAngle( 20.0 );
    m_whirlPinchDlg->setPinch( 0.0 );
    m_whirlPinchDlg->setRadius( 100.0 );
}
 
void
WhirlPinchPlugin::slotWhirlPinch()
{
    KarbonPart *part = ((KarbonView *)parent())->part();
    if( part && m_whirlPinchDlg->exec() )
        part->addCommand( new VWhirlPinchCmd( &part->document(), m_whirlPinchDlg->angle(), m_whirlPinchDlg->pinch(), m_whirlPinchDlg->radius() ), true );
}
 
VWhirlPinchDlg::VWhirlPinchDlg( TQWidget* parent, const char* name )
    : KDialogBase( parent, name, true, i18n( "Whirl Pinch" ), Ok | Cancel )
{
    // add input fields:
    TQGroupBox* group = new TQGroupBox( 2, TQt::Horizontal, i18n( "Properties" ), this );
 
    new TQLabel( i18n( "Angle:" ), group );
    m_angle = new KDoubleNumInput( group );
    new TQLabel( i18n( "Pinch:" ), group );
    m_pinch = new KDoubleNumInput( group );
    new TQLabel( i18n( "Radius:" ), group );
    m_radius = new KDoubleNumInput( group );
    group->setMinimumWidth( 300 );
 
    // signals and slots:
    connect( this, TQ_SIGNAL( okClicked() ), this, TQ_SLOT( accept() ) );
    connect( this, TQ_SIGNAL( cancelClicked() ), this, TQ_SLOT( reject() ) );
 
    setMainWidget( group );
    setFixedSize( baseSize() );
}
 
double
VWhirlPinchDlg::angle() const
{
    return m_angle->value();
}
 
double
VWhirlPinchDlg::pinch() const
{
    return m_pinch->value();
}
 
double
VWhirlPinchDlg::radius() const
{
    return m_radius->value();
}
 
void
VWhirlPinchDlg::setAngle( double value )
{
    m_angle->setValue( value);
}
 
void
VWhirlPinchDlg::setPinch( double value )
{
    m_pinch->setValue(value);
}
 
void
VWhirlPinchDlg::setRadius( double value )
{
    m_radius->setValue( value);
}
 
VWhirlPinchCmd::VWhirlPinchCmd( VDocument* doc,
    double angle, double pinch, double radius )
    : VReplacingCmd( doc, i18n( "Whirl Pinch" ) )
{
    m_angle = angle;
    m_pinch = pinch;
    m_radius = radius;
    m_center = document()->selection()->boundingBox().center();
}
 
VWhirlPinchCmd::~VWhirlPinchCmd()
{
}
 
void
VWhirlPinchCmd::visitVPath( VPath& composite )
{
    // first subdivide:
//  VInsertKnots insertKnots( 2 );
//  insertKnots.visit( composite );
 
    VVisitor::visitVPath( composite );
}
 
void
VWhirlPinchCmd::visitVSubpath( VSubpath& path )
{
    TQWMatrix m;
    KoPoint delta;
    double dist;
 
    path.first();
 
    VSegment *curr = path.current();
 
    while( curr )
    {
// TODO: selfmade this function since it's gone:
//      path.current()->convertToCurve();
 
        // Apply effect to each segment node.
        for( int i = 0; i < curr->degree(); ++i )
        {
            // calculate distance from whirl center to actual point
            delta = curr->point( i ) - m_center;
            dist = sqrt( delta.x() * delta.x() + delta.y() * delta.y() );
    
            // check if point is inside the whirl radius
            if( dist < m_radius )
            {
                m.reset();
    
                // normalize distance to whirl radius
                dist /= m_radius;
    
                double scale = pow( sin( VGlobal::pi_2 * dist ), -m_pinch );
                // pinch:
                m.translate( m_center.x(), m_center.y() );
                m.scale( scale, scale );
    
                // whirl:
                m.rotate( m_angle * ( 1.0 - dist ) * ( 1.0 - dist ) );
                m.translate( -m_center.x(), -m_center.y() );
    
                path.current()->setPoint( i, curr->point( i ).transform( m ) );
            }
 
        }
 
        if( !success() )
            setSuccess();
 
        curr = path.next();
    }
 
    // Invalidate bounding box once.
    path.invalidateBoundingBox();
}
 
#include "whirlpinchplugin.moc"