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vgradient.cpp

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00001 /*
00002 For general Scribus (>=1.3.2) copyright and licensing information please refer
00003 to the COPYING file provided with the program. Following this notice may exist
00004 a copyright and/or license notice that predates the release of Scribus 1.3.2
00005 for which a new license (GPL+exception) is in place.
00006 */
00007 /* This file is part of the KDE project
00008    Copyright (C) 2002, The Karbon Developers
00009  
00010    This library is free software; you can redistribute it and/or
00011    modify it under the terms of the GNU Library General Public
00012    License as published by the Free Software Foundation; either
00013    version 2 of the License, or (at your option) any later version.
00014  
00015    This library is distributed in the hope that it will be useful,
00016    but WITHOUT ANY WARRANTY; without even the implied warranty of
00017    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018    Library General Public License for more details.
00019  
00020    You should have received a copy of the GNU Library General Public License
00021    along with this library; see the file COPYING.LIB.  If not, write to
00022    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00023    Boston, MA 02111-1307, USA.
00024 */
00025 
00026 #include <QMutableListIterator>
00027 #include <QtAlgorithms>
00028 
00029 #include "vgradient.h"
00030 
00031 // colorStop comparison function for stable_sort function
00032 bool compareStops(const VColorStop* item1, const VColorStop* item2 ) 
00033 {
00034     double r1 = item1->rampPoint;
00035     double r2 = item2->rampPoint;
00036     return ( r1 < r2 ? true : false );
00037 }
00038 
00039 int VGradient::compareItems(const VColorStop* item1, const VColorStop* item2 ) const
00040 {
00041     double r1 = item1->rampPoint;
00042     double r2 = item2->rampPoint;
00043 
00044     return ( r1 == r2 ? 0 : r1 < r2 ? -1 : 1 );
00045 } // VGradient::VColorStopList::compareItems
00046 
00047 
00048 void VGradient::inSort( VColorStop* d )
00049 {
00050     int index = 0;
00051     register VColorStop *n = m_colorStops.value(index);
00052     while (n && compareItems(n,d) <= 0)
00053     {
00054         ++index;
00055         n = m_colorStops.value(index);
00056     }
00057     m_colorStops.insert( qMin(index, m_colorStops.size()), d );
00058 }
00059 
00060 VGradient::VGradient( VGradientType type ) : m_type( type )
00061 {
00062     // set up dummy gradient
00063     QColor color;
00064 
00065     color = QColor(255,0,0);
00066     addStop( color, 0.0, 0.5, 1.0 );
00067 
00068     color = QColor(255,255,0);
00069     addStop( color, 1.0, 0.5, 1.0 );
00070 
00071     setOrigin( FPoint( 0, 0 ) );
00072     setVector( FPoint( 0, 50 ) );
00073     setRepeatMethod( VGradient::reflect );
00074 }
00075 
00076 VGradient::VGradient( const VGradient& gradient )
00077 {
00078     m_origin        = gradient.m_origin;
00079     m_focalPoint    = gradient.m_focalPoint;
00080     m_vector        = gradient.m_vector;
00081     m_type          = gradient.m_type;
00082     m_repeatMethod  = gradient.m_repeatMethod;
00083     clearStops();
00084     QList<VColorStop*> cs = gradient.colorStops();
00085     qStableSort(cs.begin(), cs.end(), compareStops);
00086     for( int i = 0; i < cs.count(); ++i)
00087         m_colorStops.append( new VColorStop( *cs[i] ) );
00088 } // VGradient::VGradient
00089 
00090 VGradient::~VGradient()
00091 {
00092     clearStops();
00093 }
00094 
00095 VGradient& VGradient::operator=( const VGradient& gradient )
00096 {
00097     if ( this == &gradient )
00098         return *this;
00099 
00100     m_origin        = gradient.m_origin;
00101     m_focalPoint    = gradient.m_focalPoint;
00102     m_vector        = gradient.m_vector;
00103     m_type          = gradient.m_type;
00104     m_repeatMethod  = gradient.m_repeatMethod;
00105 
00106     clearStops();
00107     QList<VColorStop*> cs = gradient.colorStops();
00108     qStableSort(cs.begin(), cs.end(), compareStops);
00109     for( int i = 0; i < cs.count(); ++i )
00110         m_colorStops.append( new VColorStop( *cs[i] ) );
00111     return *this;
00112 } // VGradient::operator=
00113 
00114 const QList<VColorStop*>& VGradient::colorStops() const
00115 {
00116     return m_colorStops;
00117 } // VGradient::colorStops()
00118 
00119 void
00120 VGradient::clearStops()
00121 {
00122     while (!m_colorStops.isEmpty())
00123         delete m_colorStops.takeFirst();
00124 }
00125 
00126 void
00127 VGradient::addStop( const VColorStop& colorStop )
00128 {
00129     inSort( new VColorStop( colorStop ) );
00130 } // VGradient::addStop
00131 
00132 void
00133 VGradient::addStop( const QColor &color, double rampPoint, double midPoint, double opa, QString name, int shade )
00134 {
00135     // Clamping between 0.0 and 1.0
00136     rampPoint = qMax( 0.0, rampPoint );
00137     rampPoint = qMin( 1.0, rampPoint );
00138     // Clamping between 0.0 and 1.0
00139     midPoint = qMax( 0.0, midPoint );
00140     midPoint = qMin( 1.0, midPoint );
00141 
00142     inSort( new VColorStop( rampPoint, midPoint, color, opa, name, shade ) );
00143 }
00144 
00145 void VGradient::removeStop( VColorStop& colorstop )
00146 {
00147     int n = m_colorStops.indexOf(&colorstop);
00148     delete m_colorStops.takeAt(n);
00149 }
00150 
00151 void VGradient::removeStop( uint n )
00152 {
00153     delete m_colorStops.takeAt(n);
00154 }
00155 
00156 void VGradient::filterStops(void)
00157 {
00158     VColorStop* colorStop = NULL;
00159     bool zeroFound = false;
00160     QMutableListIterator<VColorStop*> i(m_colorStops);
00161     i.toBack();
00162     while (i.hasPrevious())
00163     {
00164         colorStop = i.previous();
00165         if (colorStop->rampPoint == 0.0 && zeroFound)
00166         {
00167             delete i.value();
00168             i.remove();
00169         }
00170         else if (colorStop->rampPoint == 0.0)
00171             zeroFound = true;
00172     }
00173     bool oneFound = false;
00174     i.toFront();
00175     while (i.hasNext())
00176     {
00177         colorStop = i.next();
00178         if (colorStop->rampPoint == 1.0 && oneFound)
00179         {
00180             delete i.value();
00181             i.remove();
00182         }
00183         else if (colorStop->rampPoint == 1.0)
00184             oneFound = true;
00185     }
00186 }
00187 
00188 void VGradient::transform( const QMatrix &m )
00189 {
00190     double mx, my;
00191     mx = m.m11() * m_origin.x() + m.m21() * m_origin.y() + m.dx();
00192     my = m.m22() * m_origin.y() + m.m12() * m_origin.x() + m.dy();
00193     m_origin = FPoint(mx, my);
00194     mx = m.m11() * m_focalPoint.x() + m.m21() * m_focalPoint.y() + m.dx();
00195     my = m.m22() * m_focalPoint.y() + m.m12() * m_focalPoint.x() + m.dy();
00196     m_focalPoint = FPoint(mx, my);
00197     mx = m.m11() * m_vector.x() + m.m21() * m_vector.y() + m.dx();
00198     my = m.m22() * m_vector.y() + m.m12() * m_vector.x() + m.dy();
00199     m_vector = FPoint(mx, my);
00200 }
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