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/* This file is part of the KDE project
Copyright (C) 2001, 2002, 2003 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 <math.h>
#include <tqwmatrix.h>
#include <tqdom.h>
#include "vglobal.h"
#include "vspiral.h"
#include "vtransformcmd.h"
#include <klocale.h>
#include <KoUnit.h>
#include <vdocument.h>
VSpiral::VSpiral( VObject* parent, VState state )
: VPath( parent, state )
{
}
VSpiral::VSpiral( VObject* parent,
const KoPoint& center, double radius, uint segments, double fade,
bool clockwise, double angle, VSpiralType type )
: VPath( parent ), m_center( center), m_radius( radius ), m_fade( fade ), m_segments( segments ), m_clockwise( clockwise ), m_angle( angle ), m_type( type )
{
init();
}
void
VSpiral::init()
{
// It makes sense to have at least one segment:
if( m_segments < 1 )
m_segments = 1;
// Make sure the radius is positive:
if( m_radius < 0.0 )
m_radius = -m_radius;
// Fall back, when fade is out of range:
if( m_fade <= 0.0 || m_fade >= 1.0 )
m_fade = 0.5;
setFillRule( winding );
// advance by pi/2 clockwise or cclockwise?
double adv_ang = ( m_clockwise ? -1.0 : 1.0 ) * VGlobal::pi_2;
// radius of first segment is non-faded radius:
double r = m_radius;
KoPoint oldP( 0.0, ( m_clockwise ? -1.0 : 1.0 ) * m_radius );
KoPoint newP;
KoPoint newCenter( 0.0, 0.0 );
moveTo( oldP );
for ( uint i = 0; i < m_segments; ++i )
{
newP.setX( r * cos( adv_ang * ( i + 2 ) ) + newCenter.x() );
newP.setY( r * sin( adv_ang * ( i + 2 ) ) + newCenter.y() );
if( m_type == round )
arcTo( oldP + newP - newCenter, newP, r );
else
lineTo( newP );
newCenter += ( newP - newCenter ) * ( 1.0 - m_fade );
oldP = newP;
r *= m_fade;
}
// translate path to center:
TQWMatrix m;
m.translate( m_center.x(), m_center.y() );
// sadly it's not feasible to simply add angle while creation.
m.rotate(
( m_angle + ( m_clockwise ? VGlobal::pi : 0.0 ) ) * // make cw-spiral start at mouse-pointer
VGlobal::one_pi_180 ); // one_pi_180 = 1/(pi/180) = 180/pi.
// only tranform the path data
VTransformCmd cmd( 0L, m );
cmd.VVisitor::visitVPath( *this );
m_matrix.reset();
}
TQString
VSpiral::name() const
{
TQString result = VObject::name();
return !result.isEmpty() ? result : i18n( "Spiral" );
}
void
VSpiral::save( TQDomElement& element ) const
{
VDocument *doc = document();
if( doc && doc->saveAsPath() )
{
VPath::save( element );
return;
}
if( state() != deleted )
{
TQDomElement me = element.ownerDocument().createElement( "SPIRAL" );
element.appendChild( me );
// save fill/stroke untransformed
VPath path( *this );
VTransformCmd cmd( 0L, m_matrix.invert() );
cmd.visit( path );
path.VObject::save( me );
//VObject::save( me );
me.setAttribute( "cx", m_center.x() );
me.setAttribute( "cy", m_center.y() );
me.setAttribute( "radius", m_radius );
me.setAttribute( "angle", m_angle );
me.setAttribute( "fade", m_fade );
me.setAttribute( "segments", m_segments );
me.setAttribute( "clockwise", m_clockwise );
me.setAttribute( "type", m_type );
TQString transform = buildSvgTransform();
if( !transform.isEmpty() )
me.setAttribute( "transform", transform );
}
}
void
VSpiral::load( const TQDomElement& element )
{
setState( normal );
TQDomNodeList list = element.childNodes();
for( uint i = 0; i < list.count(); ++i )
if( list.item( i ).isElement() )
VObject::load( list.item( i ).toElement() );
m_radius = KoUnit::parseValue( element.attribute( "radius" ) );
m_angle = element.attribute( "angle" ).toDouble();
m_fade = element.attribute( "fade" ).toDouble();
m_center.setX( KoUnit::parseValue( element.attribute( "cx" ) ) );
m_center.setY( KoUnit::parseValue( element.attribute( "cy" ) ) );
m_segments = element.attribute( "segments" ).toUInt(),
m_clockwise = element.attribute( "clockwise" ).toInt();
m_type = (VSpiral::VSpiralType)element.attribute( "type" ).toInt();
init();
TQString trafo = element.attribute( "transform" );
if( !trafo.isEmpty() )
transform( trafo );
}
VPath*
VSpiral::clone() const
{
return new VSpiral( *this );
}
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