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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2004-07-28
* Description : a color gradient widget
*
* Copyright (C) 2004-2007 by Gilles Caulier<caulier dot gilles at gmail dot com>
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation;
* either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* ============================================================ */
// TQt includes.
#include <tqimage.h>
#include <tqpainter.h>
#include <tqdrawutil.h>
// KDE includes.
#include <kimageeffect.h>
// Local includes.
#include "colorgradientwidget.h"
#include "colorgradientwidget.moc"
namespace Digikam
{
class ColorGradientWidgetPriv
{
public:
ColorGradientWidgetPriv(){}
int orientation;
TQColor color1;
TQColor color2;
};
ColorGradientWidget::ColorGradientWidget(int o, int size, TQWidget *parent)
: TQFrame(parent, 0, TQt::WDestructiveClose)
{
d = new ColorGradientWidgetPriv;
d->orientation = o;
setFrameStyle(TQFrame::Box|TQFrame::Plain);
setLineWidth(1);
if ( d->orientation ==TQt::Horizontal )
setFixedHeight( size );
else
setFixedWidth( size );
d->color1.setRgb( 0, 0, 0 );
d->color2.setRgb( 255, 255, 255 );
}
ColorGradientWidget::~ColorGradientWidget()
{
delete d;
}
void ColorGradientWidget::setColors( const TQColor &col1, const TQColor &col2 )
{
d->color1 = col1;
d->color2 = col2;
update();
}
void ColorGradientWidget::drawContents(TQPainter *p)
{
TQImage image(contentsRect().width(), contentsRect().height(), 32);
TQColor col, color1, color2;
float scale;
// Widget is disable : drawing grayed frame.
if ( !isEnabled() )
{
color1 = palette().disabled().foreground();
color2 = palette().disabled().background();
}
else
{
color1 = d->color1;
color2 = d->color2;
}
int redDiff = color2.red() - color1.red();
int greenDiff = color2.green() - color1.green();
int blueDiff = color2.blue() - color1.blue();
if ( d->orientation ==TQt::Vertical )
{
for ( int y = 0; y < image.height(); y++ )
{
scale = 1.0 * y / image.height();
col.setRgb( color1.red() + int(redDiff * scale),
color1.green() + int(greenDiff * scale),
color1.blue() + int(blueDiff * scale) );
unsigned int *p = (uint *) image.scanLine( y );
for ( int x = 0; x < image.width(); x++ )
*p++ = col.rgb();
}
}
else
{
unsigned int *p = (uint *) image.scanLine( 0 );
for ( int x = 0; x < image.width(); x++ )
{
scale = 1.0 * x / image.width();
col.setRgb( color1.red() + int(redDiff * scale),
color1.green() + int(greenDiff * scale),
color1.blue() + int(blueDiff * scale) );
*p++ = col.rgb();
}
for ( int y = 1; y < image.height(); y++ )
{
memcpy( image.scanLine( y ), image.scanLine( y - 1),
sizeof( unsigned int ) * image.width() );
}
}
const int psize = 256;
TQColor ditherPalette[psize];
for ( int s = 0; s < psize; s++ )
{
ditherPalette[s].setRgb( color1.red() + redDiff * s / psize,
color1.green() + greenDiff * s / psize,
color1.blue() + blueDiff * s / psize );
}
KImageEffect::dither(image, ditherPalette, psize);
TQPixmap pm;
pm.convertFromImage(image);
p->drawPixmap(contentsRect(), pm);
}
} // namespace Digikam
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