vgradientwidget.cpp

/* 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 <tqlabel.h>
#include <tqframe.h>
#include <tqbitmap.h>
 
#include <kcolorbutton.h>
#include <kcombobox.h>
#include <tdelocale.h>
#include <tqpainter.h>
#include <kiconloader.h>
 
#include "vgradientwidget.h"
#include "vcolordlg.h"
#include "vfill.h"
#include "vkopainter.h"
#include "vcursor.h"
 
#define midPoint_width 7
#define midPoint_height 10
static unsigned char midPoint_bits[] = {
   0x08, 0x08, 0x1c, 0x1c, 0x2a, 0x2a, 0x08, 0x08, 0x08, 0x08
};
 
#define colorStopBorder_width 11
#define colorStopBorder_height 11
static unsigned char colorStopBorder_bits[] = {
   0x20, 0x00, 0x50, 0x00, 0x50, 0x00, 0x88, 0x00, 0x88, 0x00, 0x04, 0x01,
   0x04, 0x01, 0x02, 0x02, 0x02, 0x02, 0x01, 0x04, 0xff, 0x07
};
 
#define colorStop_width 9
#define colorStop_height 10
static unsigned char colorStop_bits[] = {
   0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x38, 0x00, 0x38, 0x00, 0x7c, 0x00,
   0x7c, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xff, 0x01
};
 
VGradientWidget::VGradientWidget( VGradient& gradient, TQWidget* parent, const char* name )
        : TQWidget( parent, name ), m_gradient( &gradient )
{
    setBackgroundMode( TQt::NoBackground );
    setMinimumSize( 105, 35 );
} // VGradientWidget::VGradientWidget
 
VGradientWidget::~VGradientWidget()
{
} // VGradientWidget::~VGradientWidget
 
void VGradientWidget::paintColorStop( TQPainter& p, int x, VColor& color )
{
    TQBitmap bitmap;
 
    bitmap = TQBitmap( colorStop_width, colorStop_height, colorStop_bits, true );
    bitmap.setMask( bitmap );
    p.setPen( color );
    p.drawPixmap( x - 4, 1, bitmap );
 
    bitmap = TQBitmap( colorStopBorder_width, colorStopBorder_height, colorStopBorder_bits, true );
    bitmap.setMask( bitmap );
    p.setPen( TQt::black );
    p.drawPixmap( x - 5, 1, bitmap );
} // VGradientWidget::paintColorStop
 
void VGradientWidget::paintMidPoint( TQPainter& p, int x )
{
    TQBitmap bitmap( midPoint_width, midPoint_height, midPoint_bits, true );
    bitmap.setMask( bitmap );
    p.setPen( TQt::black );
    p.drawPixmap( x - 3, 1, bitmap );
} // VGradientWidget::paintMidPoint
 
void VGradientWidget::paintEvent( TQPaintEvent* )
{
    int w = width() - 4;  // available width for gradient and points
    int h = height() - 7; // available height for gradient and points
    int ph = colorStopBorder_height + 2; // point marker height
    int gh = h - ph;       // gradient area height
 
    TQPixmap pixmap( width(), height() );
    VKoPainter gp( &pixmap, width(), height() );
    gp.setRasterOp( TQt::XorROP );
    VGradient gradient( *m_gradient );
    gradient.setType( VGradient::linear );
    gradient.setOrigin( KoPoint( 2, 2 ) );
    gradient.setFocalPoint( KoPoint( 2, 2 ) );
    gradient.setVector( KoPoint( 2 + w, 2 ) );
    VFill fill;
    TDEIconLoader il;
    fill.pattern() = VPattern( il.iconPath( "karbon.png", TDEIcon::Small ) );
    fill.setType( VFill::patt );
    gp.setBrush( fill );
    gp.drawRect( KoRect( 2, 2, w, gh ) );
    fill.gradient() = gradient;
    fill.setType( VFill::grad );
    gp.setBrush( fill );
    gp.drawRect( KoRect( 2, 2, w, gh ) );
    gp.end();
 
    TQPainter p( &pixmap );
 
    p.setPen( colorGroup().light() );
    // light frame around widget
    p.moveTo( 1, height() - 1 );
    p.lineTo( 1, 1 );
    p.lineTo( width() - 1, 1 );
    p.lineTo( width() - 1, height() - 1 );
    p.lineTo( 1, height() - 1 );
 
    // light line between gradient and point area
    p.moveTo( 1, 3 + gh );
    p.lineTo( width() - 1, 3 + gh );
 
    p.setPen( colorGroup().dark() );
    // left-top frame around widget
    p.moveTo( 0, height() - 1 );
    p.lineTo( 0, 0 );
    p.lineTo( width() - 1, 0 );
 
    // right-bottom from around gradient
    p.moveTo( width() - 2, 2 );
    p.lineTo( width() - 2, 2 + gh );
    p.lineTo( 2, 2 + gh );
 
    // upper line around point area
    p.moveTo( 1, height() - 3 - ph );
    p.lineTo( width() - 1, height() - 3 - ph );
 
    // right-bottom line around point area
    p.moveTo( width() - 2, height() - ph - 1 );
    p.lineTo( width() - 2, height() - 2 );
    p.lineTo( 2, height() - 2 );
    
    m_pntArea.setRect( 2, height() - ph - 2, w, ph );
    // clear point area
    p.fillRect( m_pntArea.x(), m_pntArea.y(), m_pntArea.width(), m_pntArea.height(), colorGroup().background() );
 
    p.setClipRect( m_pntArea.x(), m_pntArea.y(), m_pntArea.width(), m_pntArea.height() );
    p.translate( m_pntArea.x(), m_pntArea.y() );
    
    TQPtrList<VColorStop>& colorStops = m_gradient->m_colorStops;
    if( colorStops.count() > 1 )
    {
        VColorStop* stop, *nextstop;
        for( stop = colorStops.first(), nextstop = colorStops.next();
                nextstop; stop = nextstop, nextstop = colorStops.next() )
        {
            paintColorStop( p, (int)( stop->rampPoint * m_pntArea.width() ), stop->color );
            paintMidPoint( p, (int)(( stop->rampPoint + ( nextstop->rampPoint - stop->rampPoint ) * stop->midPoint ) * m_pntArea.width() ) );
        }
        paintColorStop( p, int( stop->rampPoint * w ), stop->color );
    }
    p.end();
    bitBlt( this, 0, 0, &pixmap, 0, 0, width(), height() );
} // VGradientWidget::paintEvent
 
void VGradientWidget::mousePressEvent( TQMouseEvent* e )
{
    if( ! m_pntArea.contains( e->x(), e->y() ) )
        return;
 
    TQPtrList<VColorStop>& colorStops = m_gradient->m_colorStops;
 
    currentPoint = 0;
 
    int x = e->x() - m_pntArea.left();
 
    int i = colorStops.count() - 1;
    VColorStop *stop, *nextstop = 0;
    for( stop = colorStops.last(); i >= 0; i--, stop = colorStops.prev() )
    {
        int r = int( stop->rampPoint * m_pntArea.width() );
        if( nextstop )
        {
            int m = int( ( stop->rampPoint + ( nextstop->rampPoint - stop->rampPoint ) * stop->midPoint ) *  m_pntArea.width() );
            if( ( x > m - 5 ) && ( x < m + 5 ) )
            {
                // found mid point at position
                currentPoint = 2 * i + 2;
                if( e->button() == TQt::LeftButton )
                    setCursor( VCursor::horzMove() );
                return;
            }
        }
        if( ( x > r - 5 ) && ( x < r + 5 ) )
        {
            // found ramp point at position
            currentPoint = 2 * i + 1;
            if( e->button() == TQt::LeftButton )
                setCursor( VCursor::horzMove() );
            return;
        }
 
        nextstop = stop;
    }
} // VGradientWidget::mousePressEvent
 
void VGradientWidget::mouseReleaseEvent( TQMouseEvent* e )
{
    if( e->button() == TQt::RightButton && currentPoint )
    {
        if( m_pntArea.contains( e->x(), e->y() ) && ( currentPoint % 2 == 1 ) )
        {
            int x = e->x() - m_pntArea.left();
            // check if we are still above the actual ramp point
            int r = int( m_gradient->m_colorStops.at( int(0.5 * currentPoint) )->rampPoint * m_pntArea.width() );
            if( ( x > r - 5 ) && ( x < r + 5 ) )
            {
                m_gradient->m_colorStops.remove( int(0.5 * currentPoint) );
                update();
                emit changed();
            }
        }
    }
    setCursor( TQCursor( TQt::ArrowCursor ) );
} // VGradientWidget::mouseReleaseEvent
 
void VGradientWidget::mouseDoubleClickEvent( TQMouseEvent* e )
{
    if( ! m_pntArea.contains( e->x(), e->y() ) )
        return;
 
    if( e->button() != TQt::LeftButton )
        return;
 
    if( currentPoint % 2 == 1 )
    {
        // ramp point hit -> change color
        VColorDlg* d = new VColorDlg( m_gradient->m_colorStops.at( currentPoint / 2 )->color, this->topLevelWidget() );
        if( d->exec() == TQDialog::Accepted )
        {
            m_gradient->m_colorStops.at( currentPoint / 2 )->color = d->Color();
            update();
            emit changed();
        }
        delete d;
    }
    else if( currentPoint == 0 )
    {
        // now point hit -> create new color stop
        VColorDlg* d = new VColorDlg( m_gradient->m_colorStops.at( 0 )->color, this->topLevelWidget() );
        if( d->exec() == TQDialog::Accepted )
        {
            m_gradient->addStop( d->Color(), (float)( e->x() - 2 ) / ( m_pntArea.width() ), 0.5 );
            update();
            emit changed();
        }
        delete d;
    }
} // VGradientWidget::mouseDoubleClickEvent
 
void VGradientWidget::mouseMoveEvent( TQMouseEvent* e )
{
    if( e->state() & TQt::RightButton )
        return;
 
    TQPtrList<VColorStop>& colorStops = m_gradient->m_colorStops;
 
    if( currentPoint >= colorStops.count() * 2 )
        return;
 
    int x = e->x() - m_pntArea.left();
 
    if( currentPoint % 2 == 1 )
    {
        // move ramp point
        int actRP = int( 0.5 * ( currentPoint - 1 ) );
        int prevRP = actRP - 1;
        int nextRP = int( 0.5 * ( currentPoint + 1 ) );
        // Clip the color stop between to others.
        x = kMin( x, ( actRP < int( colorStops.count() - 1 ) ) ? int( colorStops.at( nextRP )->rampPoint * m_pntArea.width() ) : m_pntArea.width() );
        x = kMax( x, ( actRP > 0 ) ? int( colorStops.at( prevRP )->rampPoint * m_pntArea.width() ) : 0 );
        colorStops.at( actRP )->rampPoint = (float)( x ) / m_pntArea.width();
        update();
        emit changed();
    }
    else if( currentPoint > 0 )
    {
        // move mid point
        int prevRP = int( 0.5 * ( currentPoint - 1 ) );
        int nextRP = int( 0.5 * ( currentPoint + 1 ) );
        // Clip the mid point between to ramp points.
        x = kMin( x, int( colorStops.at( nextRP )->rampPoint * m_pntArea.width() ) );
        x = kMax( x, int( colorStops.at( prevRP )->rampPoint * m_pntArea.width() ) );
        colorStops.at( prevRP )->midPoint = ( (float)( x ) / m_pntArea.width() - ( colorStops.at( prevRP )->rampPoint ) ) / ( colorStops.at( nextRP )->rampPoint - colorStops.at( prevRP )->rampPoint );
        update();
        emit changed();
    }
} // VGradientWidget::mouseMoveEvent
 
#include "vgradientwidget.moc"