6 files changed, 697 insertions, 0 deletions
diff --git a/examples/threads/mandelbrot/main.cpp b/examples/threads/mandelbrot/main.cpp
new file mode 100644
index 0000000..2395ff6
--- /dev/null
+++ b/examples/threads/mandelbrot/main.cpp
@@ -0,0 +1,54 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+
+#include "mandelbrotwidget.h"
+
+//! [0]
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    MandelbrotWidget widget;
+    widget.show();
+    return app.exec();
+}
+//! [0]
diff --git a/examples/threads/mandelbrot/mandelbrot.pro b/examples/threads/mandelbrot/mandelbrot.pro
new file mode 100644
index 0000000..437f449
--- /dev/null
+++ b/examples/threads/mandelbrot/mandelbrot.pro
@@ -0,0 +1,13 @@
+HEADERS       = mandelbrotwidget.h \
+                renderthread.h
+SOURCES       = main.cpp \
+                mandelbrotwidget.cpp \
+                renderthread.cpp
+
+unix:!mac:LIBS += -lm
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/threads/mandelbrot
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS mandelbrot.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/threads/mandelbrot
+INSTALLS += target sources
diff --git a/examples/threads/mandelbrot/mandelbrotwidget.cpp b/examples/threads/mandelbrot/mandelbrotwidget.cpp
new file mode 100644
index 0000000..74b27d8
--- /dev/null
+++ b/examples/threads/mandelbrot/mandelbrotwidget.cpp
@@ -0,0 +1,240 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include <math.h>
+
+#include "mandelbrotwidget.h"
+
+//! [0]
+const double DefaultCenterX = -0.637011f;
+const double DefaultCenterY = -0.0395159f;
+const double DefaultScale = 0.00403897f;
+
+const double ZoomInFactor = 0.8f;
+const double ZoomOutFactor = 1 / ZoomInFactor;
+const int ScrollStep = 20;
+//! [0]
+
+//! [1]
+MandelbrotWidget::MandelbrotWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    centerX = DefaultCenterX;
+    centerY = DefaultCenterY;
+    pixmapScale = DefaultScale;
+    curScale = DefaultScale;
+
+    qRegisterMetaType<QImage>("QImage");
+    connect(&thread, SIGNAL(renderedImage(const QImage &, double)),
+            this, SLOT(updatePixmap(const QImage &, double)));
+
+    setWindowTitle(tr("Mandelbrot"));
+#ifndef QT_NO_CURSOR
+    setCursor(Qt::CrossCursor);
+#endif
+    resize(550, 400);
+}
+//! [1]
+
+//! [2]
+void MandelbrotWidget::paintEvent(QPaintEvent * /* event */)
+{
+    QPainter painter(this);
+    painter.fillRect(rect(), Qt::black);
+
+    if (pixmap.isNull()) {
+        painter.setPen(Qt::white);
+        painter.drawText(rect(), Qt::AlignCenter,
+                         tr("Rendering initial image, please wait..."));
+//! [2] //! [3]
+        return;
+//! [3] //! [4]
+    }
+//! [4]
+
+//! [5]
+    if (curScale == pixmapScale) {
+//! [5] //! [6]
+        painter.drawPixmap(pixmapOffset, pixmap);
+//! [6] //! [7]
+    } else {
+//! [7] //! [8]
+        double scaleFactor = pixmapScale / curScale;
+        int newWidth = int(pixmap.width() * scaleFactor);
+        int newHeight = int(pixmap.height() * scaleFactor);
+        int newX = pixmapOffset.x() + (pixmap.width() - newWidth) / 2;
+        int newY = pixmapOffset.y() + (pixmap.height() - newHeight) / 2;
+
+        painter.save();
+        painter.translate(newX, newY);
+        painter.scale(scaleFactor, scaleFactor);
+        QRectF exposed = painter.matrix().inverted().mapRect(rect()).adjusted(-1, -1, 1, 1);
+        painter.drawPixmap(exposed, pixmap, exposed);
+        painter.restore();
+    }
+//! [8] //! [9]
+
+    QString text = tr("Use mouse wheel or the '+' and '-' keys to zoom. "
+                      "Press and hold left mouse button to scroll.");
+    QFontMetrics metrics = painter.fontMetrics();
+    int textWidth = metrics.width(text);
+
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(QColor(0, 0, 0, 127));
+    painter.drawRect((width() - textWidth) / 2 - 5, 0, textWidth + 10,
+                     metrics.lineSpacing() + 5);
+    painter.setPen(Qt::white);
+    painter.drawText((width() - textWidth) / 2,
+                     metrics.leading() + metrics.ascent(), text);
+}
+//! [9]
+
+//! [10]
+void MandelbrotWidget::resizeEvent(QResizeEvent * /* event */)
+{
+    thread.render(centerX, centerY, curScale, size());
+}
+//! [10]
+
+//! [11]
+void MandelbrotWidget::keyPressEvent(QKeyEvent *event)
+{
+    switch (event->key()) {
+    case Qt::Key_Plus:
+        zoom(ZoomInFactor);
+        break;
+    case Qt::Key_Minus:
+        zoom(ZoomOutFactor);
+        break;
+    case Qt::Key_Left:
+        scroll(-ScrollStep, 0);
+        break;
+    case Qt::Key_Right:
+        scroll(+ScrollStep, 0);
+        break;
+    case Qt::Key_Down:
+        scroll(0, -ScrollStep);
+        break;
+    case Qt::Key_Up:
+        scroll(0, +ScrollStep);
+        break;
+    default:
+        QWidget::keyPressEvent(event);
+    }
+}
+//! [11]
+
+//! [12]
+void MandelbrotWidget::wheelEvent(QWheelEvent *event)
+{
+    int numDegrees = event->delta() / 8;
+    double numSteps = numDegrees / 15.0f;
+    zoom(pow(ZoomInFactor, numSteps));
+}
+//! [12]
+
+//! [13]
+void MandelbrotWidget::mousePressEvent(QMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton)
+        lastDragPos = event->pos();
+}
+//! [13]
+
+//! [14]
+void MandelbrotWidget::mouseMoveEvent(QMouseEvent *event)
+{
+    if (event->buttons() & Qt::LeftButton) {
+        pixmapOffset += event->pos() - lastDragPos;
+        lastDragPos = event->pos();
+        update();
+    }
+}
+//! [14]
+
+//! [15]
+void MandelbrotWidget::mouseReleaseEvent(QMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton) {
+        pixmapOffset += event->pos() - lastDragPos;
+        lastDragPos = QPoint();
+
+        int deltaX = (width() - pixmap.width()) / 2 - pixmapOffset.x();
+        int deltaY = (height() - pixmap.height()) / 2 - pixmapOffset.y();
+        scroll(deltaX, deltaY);
+    }
+}
+//! [15]
+
+//! [16]
+void MandelbrotWidget::updatePixmap(const QImage &image, double scaleFactor)
+{
+    if (!lastDragPos.isNull())
+        return;
+
+    pixmap = QPixmap::fromImage(image);
+    pixmapOffset = QPoint();
+    lastDragPos = QPoint();
+    pixmapScale = scaleFactor;
+    update();
+}
+//! [16]
+
+//! [17]
+void MandelbrotWidget::zoom(double zoomFactor)
+{
+    curScale *= zoomFactor;
+    update();
+    thread.render(centerX, centerY, curScale, size());
+}
+//! [17]
+
+//! [18]
+void MandelbrotWidget::scroll(int deltaX, int deltaY)
+{
+    centerX += deltaX * curScale;
+    centerY += deltaY * curScale;
+    update();
+    thread.render(centerX, centerY, curScale, size());
+}
+//! [18]
diff --git a/examples/threads/mandelbrot/mandelbrotwidget.h b/examples/threads/mandelbrot/mandelbrotwidget.h
new file mode 100644
index 0000000..3e8084c
--- /dev/null
+++ b/examples/threads/mandelbrot/mandelbrotwidget.h
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MANDELBROTWIDGET_H
+#define MANDELBROTWIDGET_H
+
+#include <QPixmap>
+#include <QWidget>
+
+#include "renderthread.h"
+
+//! [0]
+class MandelbrotWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    MandelbrotWidget(QWidget *parent = 0);
+
+protected:
+    void paintEvent(QPaintEvent *event);
+    void resizeEvent(QResizeEvent *event);
+    void keyPressEvent(QKeyEvent *event);
+    void wheelEvent(QWheelEvent *event);
+    void mousePressEvent(QMouseEvent *event);
+    void mouseMoveEvent(QMouseEvent *event);
+    void mouseReleaseEvent(QMouseEvent *event);
+
+private slots:
+    void updatePixmap(const QImage &image, double scaleFactor);
+
+private:
+    void zoom(double zoomFactor);
+    void scroll(int deltaX, int deltaY);
+
+    RenderThread thread;
+    QPixmap pixmap;
+    QPoint pixmapOffset;
+    QPoint lastDragPos;
+    double centerX;
+    double centerY;
+    double pixmapScale;
+    double curScale;
+};
+//! [0]
+
+#endif
diff --git a/examples/threads/mandelbrot/renderthread.cpp b/examples/threads/mandelbrot/renderthread.cpp
new file mode 100644
index 0000000..5879035
--- /dev/null
+++ b/examples/threads/mandelbrot/renderthread.cpp
@@ -0,0 +1,216 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include <math.h>
+
+#include "renderthread.h"
+
+//! [0]
+RenderThread::RenderThread(QObject *parent)
+    : QThread(parent)
+{
+    restart = false;
+    abort = false;
+
+    for (int i = 0; i < ColormapSize; ++i)
+        colormap[i] = rgbFromWaveLength(380.0 + (i * 400.0 / ColormapSize));
+}
+//! [0]
+
+//! [1]
+RenderThread::~RenderThread()
+{
+    mutex.lock();
+    abort = true;
+    condition.wakeOne();
+    mutex.unlock();
+
+    wait();
+}
+//! [1]
+
+//! [2]
+void RenderThread::render(double centerX, double centerY, double scaleFactor,
+                          QSize resultSize)
+{
+    QMutexLocker locker(&mutex);
+
+    this->centerX = centerX;
+    this->centerY = centerY;
+    this->scaleFactor = scaleFactor;
+    this->resultSize = resultSize;
+
+    if (!isRunning()) {
+        start(LowPriority);
+    } else {
+        restart = true;
+        condition.wakeOne();
+    }
+}
+//! [2]
+
+//! [3]
+void RenderThread::run()
+{
+    forever {
+        mutex.lock();
+        QSize resultSize = this->resultSize;
+        double scaleFactor = this->scaleFactor;
+        double centerX = this->centerX;
+        double centerY = this->centerY;
+        mutex.unlock();
+//! [3]
+
+//! [4]
+        int halfWidth = resultSize.width() / 2;
+//! [4] //! [5]
+        int halfHeight = resultSize.height() / 2;
+        QImage image(resultSize, QImage::Format_RGB32);
+
+        const int NumPasses = 8;
+        int pass = 0;
+        while (pass < NumPasses) {
+            const int MaxIterations = (1 << (2 * pass + 6)) + 32;
+            const int Limit = 4;
+            bool allBlack = true;
+
+            for (int y = -halfHeight; y < halfHeight; ++y) {
+                if (restart)
+                    break;
+                if (abort)
+                    return;
+
+                uint *scanLine =
+                        reinterpret_cast<uint *>(image.scanLine(y + halfHeight));
+                double ay = centerY + (y * scaleFactor);
+
+                for (int x = -halfWidth; x < halfWidth; ++x) {
+                    double ax = centerX + (x * scaleFactor);
+                    double a1 = ax;
+                    double b1 = ay;
+                    int numIterations = 0;
+
+                    do {
+                        ++numIterations;
+                        double a2 = (a1 * a1) - (b1 * b1) + ax;
+                        double b2 = (2 * a1 * b1) + ay;
+                        if ((a2 * a2) + (b2 * b2) > Limit)
+                            break;
+
+                        ++numIterations;
+                        a1 = (a2 * a2) - (b2 * b2) + ax;
+                        b1 = (2 * a2 * b2) + ay;
+                        if ((a1 * a1) + (b1 * b1) > Limit)
+                            break;
+                    } while (numIterations < MaxIterations);
+
+                    if (numIterations < MaxIterations) {
+                        *scanLine++ = colormap[numIterations % ColormapSize];
+                        allBlack = false;
+                    } else {
+                        *scanLine++ = qRgb(0, 0, 0);
+                    }
+                }
+            }
+
+            if (allBlack && pass == 0) {
+                pass = 4;
+            } else {
+                if (!restart)
+                    emit renderedImage(image, scaleFactor);
+//! [5] //! [6]
+                ++pass;
+            }
+//! [6] //! [7]
+        }
+//! [7]
+
+//! [8]
+        mutex.lock();
+//! [8] //! [9]
+        if (!restart)
+            condition.wait(&mutex);
+        restart = false;
+        mutex.unlock();
+    }
+}
+//! [9]
+
+//! [10]
+uint RenderThread::rgbFromWaveLength(double wave)
+{
+    double r = 0.0;
+    double g = 0.0;
+    double b = 0.0;
+
+    if (wave >= 380.0 && wave <= 440.0) {
+        r = -1.0 * (wave - 440.0) / (440.0 - 380.0);
+        b = 1.0;
+    } else if (wave >= 440.0 && wave <= 490.0) {
+        g = (wave - 440.0) / (490.0 - 440.0);
+        b = 1.0;
+    } else if (wave >= 490.0 && wave <= 510.0) {
+        g = 1.0;
+        b = -1.0 * (wave - 510.0) / (510.0 - 490.0);
+    } else if (wave >= 510.0 && wave <= 580.0) {
+        r = (wave - 510.0) / (580.0 - 510.0);
+        g = 1.0;
+    } else if (wave >= 580.0 && wave <= 645.0) {
+        r = 1.0;
+        g = -1.0 * (wave - 645.0) / (645.0 - 580.0);
+    } else if (wave >= 645.0 && wave <= 780.0) {
+        r = 1.0;
+    }
+
+    double s = 1.0;
+    if (wave > 700.0)
+        s = 0.3 + 0.7 * (780.0 - wave) / (780.0 - 700.0);
+    else if (wave <  420.0)
+        s = 0.3 + 0.7 * (wave - 380.0) / (420.0 - 380.0);
+
+    r = pow(r * s, 0.8);
+    g = pow(g * s, 0.8);
+    b = pow(b * s, 0.8);
+    return qRgb(int(r * 255), int(g * 255), int(b * 255));
+}
+//! [10]
diff --git a/examples/threads/mandelbrot/renderthread.h b/examples/threads/mandelbrot/renderthread.h
new file mode 100644
index 0000000..2b03186
--- /dev/null
+++ b/examples/threads/mandelbrot/renderthread.h
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef RENDERTHREAD_H
+#define RENDERTHREAD_H
+
+#include <QMutex>
+#include <QSize>
+#include <QThread>
+#include <QWaitCondition>
+
+QT_BEGIN_NAMESPACE
+class QImage;
+QT_END_NAMESPACE
+
+//! [0]
+class RenderThread : public QThread
+{
+    Q_OBJECT
+
+public:
+    RenderThread(QObject *parent = 0);
+    ~RenderThread();
+
+    void render(double centerX, double centerY, double scaleFactor,
+                QSize resultSize);
+
+signals:
+    void renderedImage(const QImage &image, double scaleFactor);
+
+protected:
+    void run();
+
+private:
+    uint rgbFromWaveLength(double wave);
+
+    QMutex mutex;
+    QWaitCondition condition;
+    double centerX;
+    double centerY;
+    double scaleFactor;
+    QSize resultSize;
+    bool restart;
+    bool abort;
+
+    enum { ColormapSize = 512 };
+    uint colormap[ColormapSize];
+};
+//! [0]
+
+#endif