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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">extrafiltersplugin.cpp Example File<br /><small><small>tools/plugandpaintplugins/extrafilters/extrafiltersplugin.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

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** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

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****************************************************************************/

#include <QtGui>

#include <math.h>

#include <stdlib.h>

#include "extrafiltersplugin.h"

QStringList ExtraFiltersPlugin::filters() const

{

return QStringList() << tr("Flip Horizontally") << tr("Flip Vertically")

<< tr("Smudge...") << tr("Threshold...");

}

QImage ExtraFiltersPlugin::filterImage(const QString &filter,

const QImage &image, QWidget *parent)

{

QImage original = image.convertToFormat(QImage::Format_RGB32);

QImage result = original;

if (filter == tr("Flip Horizontally")) {

for (int y = 0; y < original.height(); ++y) {

for (int x = 0; x < original.width(); ++x) {

int pixel = original.pixel(original.width() - x - 1, y);

result.setPixel(x, y, pixel);

}

} else if (filter == tr("Flip Vertically")) {

for (int y = 0; y < original.height(); ++y) {

for (int x = 0; x < original.width(); ++x) {

int pixel = original.pixel(x, original.height() - y - 1);

result.setPixel(x, y, pixel);

}

} else if (filter == tr("Smudge...")) {

bool ok;

int numIters = QInputDialog::getInteger(parent, tr("Smudge Filter"),

tr("Enter number of iterations:"),

5, 1, 20, 1, &ok);

if (ok) {

for (int i = 0; i < numIters; ++i) {

for (int y = 1; y < original.height() - 1; ++y) {

for (int x = 1; x < original.width() - 1; ++x) {

int p1 = original.pixel(x, y);

int p2 = original.pixel(x, y + 1);

int p3 = original.pixel(x, y - 1);

int p4 = original.pixel(x + 1, y);

int p5 = original.pixel(x - 1, y);

int red = (qRed(p1) + qRed(p2) + qRed(p3) + qRed(p4)

+ qRed(p5)) / 5;

int green = (qGreen(p1) + qGreen(p2) + qGreen(p3)

+ qGreen(p4) + qGreen(p5)) / 5;

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int blue = (qBlue(p1) + qBlue(p2) + qBlue(p3)

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+ qBlue(p4) + qBlue(p5)) / 5;

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int alpha = (qAlpha(p1) + qAlpha(p2) + qAlpha(p3)

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+ qAlpha(p4) + qAlpha(p5)) / 5;

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result.setPixel(x, y, qRgba(red, green, blue, alpha));

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}

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}

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}

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}

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} else if (filter == tr("Threshold...")) {

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bool ok;

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int threshold = QInputDialog::getInteger(parent, tr("Threshold Filter"),

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tr("Enter threshold:"),

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10, 1, 256, 1, &ok);

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if (ok) {

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int factor = 256 / threshold;

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for (int y = 0; y < original.height(); ++y) {

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for (int x = 0; x < original.width(); ++x) {

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int pixel = original.pixel(x, y);

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result.setPixel(x, y, qRgba(qRed(pixel) / factor * factor,

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qGreen(pixel) / factor * factor,

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qBlue(pixel) / factor * factor,

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qAlpha(pixel)));

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}

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}

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}

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}

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return result;

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}

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Q_EXPORT_PLUGIN(ExtraFiltersPlugin)</pre>

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