Qt 4.0: window.cpp Example File (painting/transformations/window.cpp)

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# window.cpp Example File
painting/transformations/window.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation 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 "window.h"

        Window::Window()
        {
            originalRenderArea = new RenderArea;

            shapeComboBox = new QComboBox;
            shapeComboBox->addItem(tr("Clock"));
            shapeComboBox->addItem(tr("House"));
            shapeComboBox->addItem(tr("Text"));
            shapeComboBox->addItem(tr("Truck"));

            QGridLayout *layout = new QGridLayout;
            layout->addWidget(originalRenderArea, 0, 0);
            layout->addWidget(shapeComboBox, 1, 0);

            for (int i = 0; i < NumTransformedAreas; ++i) {
                transformedRenderAreas[i] = new RenderArea;

                operationComboBoxes[i] = new QComboBox;
                operationComboBoxes[i]->addItem(tr("No transformation"));
                operationComboBoxes[i]->addItem(tr("Rotate by 60\xB0"));
                operationComboBoxes[i]->addItem(tr("Scale to 75%"));
                operationComboBoxes[i]->addItem(tr("Translate by (50, 50)"));

                connect(operationComboBoxes[i], SIGNAL(activated(int)),
                        this, SLOT(operationChanged()));

                layout->addWidget(transformedRenderAreas[i], 0, i + 1);
                layout->addWidget(operationComboBoxes[i], 1, i + 1);
            }

            setLayout(layout);
            setupShapes();
            shapeSelected(0);

            setWindowTitle(tr("Transformations"));
        }

        void Window::setupShapes()
        {
            QPainterPath truck;
            truck.setFillRule(Qt::WindingFill);
            truck.moveTo(0.0, 87.0);
            truck.lineTo(0.0, 60.0);
            truck.lineTo(10.0, 60.0);
            truck.lineTo(35.0, 35.0);
            truck.lineTo(100.0, 35.0);
            truck.lineTo(100.0, 87.0);
            truck.lineTo(0.0, 87.0);
            truck.moveTo(17.0, 60.0);
            truck.lineTo(55.0, 60.0);
            truck.lineTo(55.0, 40.0);
            truck.lineTo(37.0, 40.0);
            truck.lineTo(17.0, 60.0);
            truck.addEllipse(17.0, 75.0, 25.0, 25.0);
            truck.addEllipse(63.0, 75.0, 25.0, 25.0);

            QPainterPath clock;
            clock.addEllipse(-50.0, -50.0, 100.0, 100.0);
            clock.addEllipse(-48.0, -48.0, 96.0, 96.0);
            clock.moveTo(0.0, 0.0);
            clock.lineTo(-2.0, -2.0);
            clock.lineTo(0.0, -42.0);
            clock.lineTo(2.0, -2.0);
            clock.lineTo(0.0, 0.0);
            clock.moveTo(0.0, 0.0);
            clock.lineTo(2.732, -0.732);
            clock.lineTo(24.495, 14.142);
            clock.lineTo(0.732, 2.732);
            clock.lineTo(0.0, 0.0);

            QPainterPath house;
            house.moveTo(-45.0, -20.0);
            house.lineTo(0.0, -45.0);
            house.lineTo(45.0, -20.0);
            house.lineTo(45.0, 45.0);
            house.lineTo(-45.0, 45.0);
            house.lineTo(-45.0, -20.0);
            house.addRect(15.0, 5.0, 20.0, 35.0);
            house.addRect(-35.0, -15.0, 25.0, 25.0);

            QPainterPath text;
            QFont font;
            font.setPixelSize(50);
            QRect fontBoundingRect = QFontMetrics(font).boundingRect(tr("Qt"));
            text.addText(-QPointF(fontBoundingRect.center()), font, tr("Qt"));

            shapes.append(clock);
            shapes.append(house);
            shapes.append(text);
            shapes.append(truck);

            connect(shapeComboBox, SIGNAL(activated(int)),
                    this, SLOT(shapeSelected(int)));
        }

        void Window::operationChanged()
        {
            static const Operation operationTable[] = {
                NoTransformation, Rotate, Scale, Translate
            };

            QList<Operation> operations;
            for (int i = 0; i < NumTransformedAreas; ++i) {
                int index = operationComboBoxes[i]->currentIndex();
                operations.append(operationTable[index]);
                transformedRenderAreas[i]->setOperations(operations);
            }
        }

        void Window::shapeSelected(int index)
        {
            QPainterPath shape = shapes[index];
            originalRenderArea->setShape(shape);
            for (int i = 0; i < NumTransformedAreas; ++i)
                transformedRenderAreas[i]->setShape(shape);
        }