displaywidget.cpp Example File | Qt SVG 5.4

- Qt 5.4
- Qt SVG
- SVG Generator Example
- displaywidget.cpp Example File
- Qt 5.4.2 Reference Documentation

# displaywidget.cpp Example File

svggenerator/displaywidget.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include <QtWidgets>
    #include "displaywidget.h"

    DisplayWidget::DisplayWidget(QWidget *parent)
        : QWidget(parent)
    {
        QPainterPath car;
        QPainterPath house;

        QFile file(":resources/shapes.dat");
        file.open(QFile::ReadOnly);
        QDataStream stream(&file);
        stream >> car >> house >> tree >> moon;
        file.close();

        shapeMap[Car] = car;
        shapeMap[House] = house;

        background = Sky;
        shapeColor = Qt::darkYellow;
        shape = House;
    }

    void DisplayWidget::paintEvent(QPaintEvent * /* event */)
    {
        QPainter painter;
        painter.begin(this);
        painter.setRenderHint(QPainter::Antialiasing);
        paint(painter);
        painter.end();
    }

    void DisplayWidget::paint(QPainter &painter)
    {
        painter.setClipRect(QRect(0, 0, 200, 200));
        painter.setPen(Qt::NoPen);

        switch (background) {
        case Sky:
        default:
            painter.fillRect(QRect(0, 0, 200, 200), Qt::darkBlue);
            painter.translate(145, 10);
            painter.setBrush(Qt::white);
            painter.drawPath(moon);
            painter.translate(-145, -10);
            break;
        case Trees:
        {
            painter.fillRect(QRect(0, 0, 200, 200), Qt::darkGreen);
            painter.setBrush(Qt::green);
            painter.setPen(Qt::black);
            for (int y = -55, row = 0; y < 200; y += 50, ++row) {
                int xs;
                if (row == 2 || row == 3)
                    xs = 150;
                else
                    xs = 50;
                for (int x = 0; x < 200; x += xs) {
                    painter.save();
                    painter.translate(x, y);
                    painter.drawPath(tree);
                    painter.restore();
                }
            }
            break;
        }
        case Road:
            painter.fillRect(QRect(0, 0, 200, 200), Qt::gray);
            painter.setPen(QPen(Qt::white, 4, Qt::DashLine));
            painter.drawLine(QLine(0, 35, 200, 35));
            painter.drawLine(QLine(0, 165, 200, 165));
            break;
        }

        painter.setBrush(shapeColor);
        painter.setPen(Qt::black);
        painter.translate(100, 100);
        painter.drawPath(shapeMap[shape]);
    }

    QColor DisplayWidget::color() const
    {
        return shapeColor;
    }

    void DisplayWidget::setBackground(Background background)
    {
        this->background = background;
        update();
    }

    void DisplayWidget::setColor(const QColor &color)
    {
        this->shapeColor = color;
        update();
    }

    void DisplayWidget::setShape(Shape shape)
    {
        this->shape = shape;
        update();
    }