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