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/* This file is part of the KDE libraries
Copyright (C) 1998, 1999 Christian Tibirna <ctibirna@total.net>
(C) 1998, 1999 Daniel M. Duley <mosfet@kde.org>
(C) 1998, 1999 Dirk A. Mueller <mueller@kde.org>
*/
// $Id$
#ifndef __OGFX_EFFECT_H
#define __OGFX_EFFECT_H
#include <qpixmap.h>
#include <qimage.h>
/**
* This class includes various pixmap-based graphical effects.
*
* Everything is
* static, so there is no need to create an instance of this class. You can
* just call the static methods. They are encapsulated here merely to provide
* a common namespace.
*/
class OGfxEffect
{
public:
enum GradientType { VerticalGradient, HorizontalGradient,
DiagonalGradient, CrossDiagonalGradient,
PyramidGradient, RectangleGradient,
PipeCrossGradient, EllipticGradient };
enum RGBComponent { Red, Green, Blue };
enum Lighting {NorthLite, NWLite, WestLite, SWLite,
SouthLite, SELite, EastLite, NELite};
/**
* Create a gradient from color a to color b of the specified type.
*
* @param pixmap The pixmap to process.
* @param ca Color a.
* @param cb Color b.
* @param type The type of gradient.
* @param ncols The number of colors to use when not running on a
* truecolor display. The gradient will be dithered to this number of
* colors. Pass 0 to prevent dithering.
* @return Returns the generated pixmap, for convenience.
*/
static QPixmap& gradient(QPixmap& pixmap, const QColor &ca, const QColor &cb,
GradientType type, int ncols=3);
static QImage gradient (const QSize &size, const QColor &ca, const QColor &cb,
GradientType type, int ncols=3);
/**
* Blend the provided pixmap into a background of the indicated color
*
* @param pixmap The pixmap to process.
* @param initial_intensity this parameter takes values from -1 to 1:
* @li If positive, it tells how much to fade the image in its
* less affected spot.
* @li If negative, it tells roughly indicates how much of the image
* remains unaffected
* @param bgnd Indicates the color of the background to blend in.
* @param eff Lets you choose what kind of blending you like.
* @param anti_dir Blend in the opposite direction (makes no much sense
* with concentric blending effects).
* @return Returns the @ref pixmap(), provided for convenience.
*/
static QPixmap& blend(QPixmap& pixmap, float initial_intensity,
const QColor &bgnd, GradientType eff,
bool anti_dir=false, int ncols=3);
static QImage& blend(QImage &image, float initial_intensity,
const QColor &bgnd, GradientType eff,
bool anti_dir);
};
#endif
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