window.cpp Example File

painting/painterpaths/window.cpp 
 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, 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 The Qt Company Ltd 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 "renderarea.h"
 #include "window.h"

 #include <QtWidgets>

 #include <qmath.h>

 Window::Window()
 {
     QPainterPath rectPath;
     rectPath.moveTo(20.0, 30.0);
     rectPath.lineTo(80.0, 30.0);
     rectPath.lineTo(80.0, 70.0);
     rectPath.lineTo(20.0, 70.0);
     rectPath.closeSubpath();

     QPainterPath roundRectPath;
     roundRectPath.moveTo(80.0, 35.0);
     roundRectPath.arcTo(70.0, 30.0, 10.0, 10.0, 0.0, 90.0);
     roundRectPath.lineTo(25.0, 30.0);
     roundRectPath.arcTo(20.0, 30.0, 10.0, 10.0, 90.0, 90.0);
     roundRectPath.lineTo(20.0, 65.0);
     roundRectPath.arcTo(20.0, 60.0, 10.0, 10.0, 180.0, 90.0);
     roundRectPath.lineTo(75.0, 70.0);
     roundRectPath.arcTo(70.0, 60.0, 10.0, 10.0, 270.0, 90.0);
     roundRectPath.closeSubpath();

     QPainterPath ellipsePath;
     ellipsePath.moveTo(80.0, 50.0);
     ellipsePath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0);

     QPainterPath piePath;
     piePath.moveTo(50.0, 50.0);
     piePath.arcTo(20.0, 30.0, 60.0, 40.0, 60.0, 240.0);
     piePath.closeSubpath();

     QPainterPath polygonPath;
     polygonPath.moveTo(10.0, 80.0);
     polygonPath.lineTo(20.0, 10.0);
     polygonPath.lineTo(80.0, 30.0);
     polygonPath.lineTo(90.0, 70.0);
     polygonPath.closeSubpath();

     QPainterPath groupPath;
     groupPath.moveTo(60.0, 40.0);
     groupPath.arcTo(20.0, 20.0, 40.0, 40.0, 0.0, 360.0);
     groupPath.moveTo(40.0, 40.0);
     groupPath.lineTo(40.0, 80.0);
     groupPath.lineTo(80.0, 80.0);
     groupPath.lineTo(80.0, 40.0);
     groupPath.closeSubpath();

     QPainterPath textPath;
     QFont timesFont("Times", 50);
     timesFont.setStyleStrategy(QFont::ForceOutline);
     textPath.addText(10, 70, timesFont, tr("Qt"));

     QPainterPath bezierPath;
     bezierPath.moveTo(20, 30);
     bezierPath.cubicTo(80, 0, 50, 50, 80, 80);

     QPainterPath starPath;
     starPath.moveTo(90, 50);
     for (int i = 1; i < 5; ++i) {
         starPath.lineTo(50 + 40 * std::cos(0.8 * i * M_PI),
                         50 + 40 * std::sin(0.8 * i * M_PI));
     }
     starPath.closeSubpath();

     renderAreas.push_back(new RenderArea(rectPath));
     renderAreas.push_back(new RenderArea(roundRectPath));
     renderAreas.push_back(new RenderArea(ellipsePath));
     renderAreas.push_back(new RenderArea(piePath));
     renderAreas.push_back(new RenderArea(polygonPath));
     renderAreas.push_back(new RenderArea(groupPath));
     renderAreas.push_back(new RenderArea(textPath));
     renderAreas.push_back(new RenderArea(bezierPath));
     renderAreas.push_back(new RenderArea(starPath));

     fillRuleComboBox = new QComboBox;
     fillRuleComboBox->addItem(tr("Odd Even"), Qt::OddEvenFill);
     fillRuleComboBox->addItem(tr("Winding"), Qt::WindingFill);

     fillRuleLabel = new QLabel(tr("Fill &Rule:"));
     fillRuleLabel->setBuddy(fillRuleComboBox);

     fillColor1ComboBox = new QComboBox;
     populateWithColors(fillColor1ComboBox);
     fillColor1ComboBox->setCurrentIndex(fillColor1ComboBox->findText("mediumslateblue"));

     fillColor2ComboBox = new QComboBox;
     populateWithColors(fillColor2ComboBox);
     fillColor2ComboBox->setCurrentIndex(fillColor2ComboBox->findText("cornsilk"));

     fillGradientLabel = new QLabel(tr("&Fill Gradient:"));
     fillGradientLabel->setBuddy(fillColor1ComboBox);

     fillToLabel = new QLabel(tr("to"));
     fillToLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

     penWidthSpinBox = new QSpinBox;
     penWidthSpinBox->setRange(0, 20);

     penWidthLabel = new QLabel(tr("&Pen Width:"));
     penWidthLabel->setBuddy(penWidthSpinBox);

     penColorComboBox = new QComboBox;
     populateWithColors(penColorComboBox);
     penColorComboBox->setCurrentIndex(penColorComboBox->findText("darkslateblue"));

     penColorLabel = new QLabel(tr("Pen &Color:"));
     penColorLabel->setBuddy(penColorComboBox);

     rotationAngleSpinBox = new QSpinBox;
     rotationAngleSpinBox->setRange(0, 359);
     rotationAngleSpinBox->setWrapping(true);
     rotationAngleSpinBox->setSuffix(QLatin1String("\xB0"));

     rotationAngleLabel = new QLabel(tr("&Rotation Angle:"));
     rotationAngleLabel->setBuddy(rotationAngleSpinBox);

     connect(fillRuleComboBox, SIGNAL(activated(int)), this, SLOT(fillRuleChanged()));
     connect(fillColor1ComboBox, SIGNAL(activated(int)), this, SLOT(fillGradientChanged()));
     connect(fillColor2ComboBox, SIGNAL(activated(int)), this, SLOT(fillGradientChanged()));
     connect(penColorComboBox, SIGNAL(activated(int)), this, SLOT(penColorChanged()));

     for(QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); it++) {
         connect(penWidthSpinBox, SIGNAL(valueChanged(int)), *it, SLOT(setPenWidth(int)));
         connect(rotationAngleSpinBox, SIGNAL(valueChanged(int)), *it, SLOT(setRotationAngle(int)));
     }

     QGridLayout *topLayout = new QGridLayout;

     int i=0;
     for(QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); it++, i++)
         topLayout->addWidget(*it, i / 3, i % 3);

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->addLayout(topLayout, 0, 0, 1, 4);
     mainLayout->addWidget(fillRuleLabel, 1, 0);
     mainLayout->addWidget(fillRuleComboBox, 1, 1, 1, 3);
     mainLayout->addWidget(fillGradientLabel, 2, 0);
     mainLayout->addWidget(fillColor1ComboBox, 2, 1);
     mainLayout->addWidget(fillToLabel, 2, 2);
     mainLayout->addWidget(fillColor2ComboBox, 2, 3);
     mainLayout->addWidget(penWidthLabel, 3, 0);
     mainLayout->addWidget(penWidthSpinBox, 3, 1, 1, 3);
     mainLayout->addWidget(penColorLabel, 4, 0);
     mainLayout->addWidget(penColorComboBox, 4, 1, 1, 3);
     mainLayout->addWidget(rotationAngleLabel, 5, 0);
     mainLayout->addWidget(rotationAngleSpinBox, 5, 1, 1, 3);
     setLayout(mainLayout);

     fillRuleChanged();
     fillGradientChanged();
     penColorChanged();
     penWidthSpinBox->setValue(2);

     setWindowTitle(tr("Painter Paths"));
 }

 void Window::fillRuleChanged()
 {
     Qt::FillRule rule = (Qt::FillRule)currentItemData(fillRuleComboBox).toInt();

     for (QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); ++it)
         (*it)->setFillRule(rule);
 }

 void Window::fillGradientChanged()
 {
     QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
     QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));

     for (QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); ++it)
         (*it)->setFillGradient(color1, color2);
 }

 void Window::penColorChanged()
 {
     QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));

     for (QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); ++it)
         (*it)->setPenColor(color);
 }

 void Window::populateWithColors(QComboBox *comboBox)
 {
     QStringList colorNames = QColor::colorNames();
     foreach (QString name, colorNames)
         comboBox->addItem(name, QColor(name));
 }

 QVariant Window::currentItemData(QComboBox *comboBox)
 {
     return comboBox->itemData(comboBox->currentIndex());
 }

© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.
The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.
Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.