/******************************************************************************** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.**** This file is part of the example classes of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include <QtGui>#include <math.h>#include <stdlib.h>#include "basictoolsplugin.h"const float Pi = 3.14159f;QStringList BasicToolsPlugin::brushes() const{    return QStringList() << tr("Pencil") << tr("Air Brush")                         << tr("Random Letters");}QRect BasicToolsPlugin::mousePress(const QString &brush, QPainter &painter,                                   const QPoint &pos){    return mouseMove(brush, painter, pos, pos);}QRect BasicToolsPlugin::mouseMove(const QString &brush, QPainter &painter,                                  const QPoint &oldPos, const QPoint &newPos){    painter.save();    int rad = painter.pen().width() / 2;    QRect boundingRect = QRect(oldPos, newPos).normalized()                                              .adjusted(-rad, -rad, +rad, +rad);    QColor color = painter.pen().color();    int thickness = painter.pen().width();    QColor transparentColor(color.red(), color.green(), color.blue(), 0);    if (brush == tr("Pencil")) {        painter.drawLine(oldPos, newPos);    } else if (brush == tr("Air Brush")) {        int numSteps = 2 + (newPos - oldPos).manhattanLength() / 2;        painter.setBrush(QBrush(color, Qt::Dense6Pattern));        painter.setPen(Qt::NoPen);        for (int i = 0; i < numSteps; ++i) {            int x = oldPos.x() + i * (newPos.x() - oldPos.x()) / (numSteps - 1);            int y = oldPos.y() + i * (newPos.y() - oldPos.y()) / (numSteps - 1);            painter.drawEllipse(x - (thickness / 2), y - (thickness / 2),                                thickness, thickness);        }    } else if (brush == tr("Random Letters")) {        QChar ch('A' + (qrand() % 26));        QFont biggerFont = painter.font();        biggerFont.setBold(true);        biggerFont.setPointSize(biggerFont.pointSize() + thickness);        painter.setFont(biggerFont);        painter.drawText(newPos, QString(ch));        QFontMetrics metrics(painter.font());        boundingRect = metrics.boundingRect(ch);        boundingRect.translate(newPos);        boundingRect.adjust(-10, -10, +10, +10);    }    painter.restore();    return boundingRect;}QRect BasicToolsPlugin::mouseRelease(const QString & /* brush */,                                     QPainter & /* painter */,                                     const QPoint & /* pos */){    return QRect(0, 0, 0, 0);}QStringList BasicToolsPlugin::shapes() const{    return QStringList() << tr("Circle") << tr("Star") << tr("Text...");}QPainterPath BasicToolsPlugin::generateShape(const QString &shape,                                             QWidget *parent){    QPainterPath path;    if (shape == tr("Circle")) {        path.addEllipse(0, 0, 50, 50);    } else if (shape == tr("Star")) {        path.moveTo(90, 50);        for (int i = 1; i < 5; ++i) {            path.lineTo(50 + 40 * cos(0.8 * i * Pi),                        50 + 40 * sin(0.8 * i * Pi));        }        path.closeSubpath();    } else if (shape == tr("Text...")) {        QString text = QInputDialog::getText(parent, tr("Text Shape"),                                             tr("Enter text:"),                                             QLineEdit::Normal, tr("Qt"));        if (!text.isEmpty()) {            QFont timesFont("Times", 50);            timesFont.setStyleStrategy(QFont::ForceOutline);            path.addText(0, 0, timesFont, text);        }    }    return path;}QStringList BasicToolsPlugin::filters() const{    return QStringList() << tr("Invert Pixels") << tr("Swap RGB")                         << tr("Grayscale");}QImage BasicToolsPlugin::filterImage(const QString &filter, const QImage &image,                                     QWidget * /* parent */){    QImage result = image.convertToFormat(QImage::Format_RGB32);    if (filter == tr("Invert Pixels")) {        result.invertPixels();    } else if (filter == tr("Swap RGB")) {        result = result.rgbSwapped();    } else if (filter == tr("Grayscale")) {        for (int y = 0; y < result.height(); ++y) {            for (int x = 0; x < result.width(); ++x) {                int pixel = result.pixel(x, y);                int gray = qGray(pixel);                int alpha = qAlpha(pixel);                result.setPixel(x, y, qRgba(gray, gray, gray, alpha));            }        }    }    return result;}Q_EXPORT_PLUGIN2(pnp_basictools, BasicToolsPlugin)