Qt Reference Documentation

window.cpp Example File

painting/basicdrawing/window.cpp 
 /****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** 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 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 <QtGui>

 #include "renderarea.h"
 #include "window.h"

 const int IdRole = Qt::UserRole;

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

     shapeComboBox = new QComboBox;
     shapeComboBox->addItem(tr("Polygon"), RenderArea::Polygon);
     shapeComboBox->addItem(tr("Rectangle"), RenderArea::Rect);
     shapeComboBox->addItem(tr("Rounded Rectangle"), RenderArea::RoundedRect);
     shapeComboBox->addItem(tr("Ellipse"), RenderArea::Ellipse);
     shapeComboBox->addItem(tr("Pie"), RenderArea::Pie);
     shapeComboBox->addItem(tr("Chord"), RenderArea::Chord);
     shapeComboBox->addItem(tr("Path"), RenderArea::Path);
     shapeComboBox->addItem(tr("Line"), RenderArea::Line);
     shapeComboBox->addItem(tr("Polyline"), RenderArea::Polyline);
     shapeComboBox->addItem(tr("Arc"), RenderArea::Arc);
     shapeComboBox->addItem(tr("Points"), RenderArea::Points);
     shapeComboBox->addItem(tr("Text"), RenderArea::Text);
     shapeComboBox->addItem(tr("Pixmap"), RenderArea::Pixmap);

     shapeLabel = new QLabel(tr("&Shape:"));
     shapeLabel->setBuddy(shapeComboBox);

     penWidthSpinBox = new QSpinBox;
     penWidthSpinBox->setRange(0, 20);
 #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
     penWidthSpinBox->setSpecialValueText(tr("0"));
 #else
     penWidthSpinBox->setSpecialValueText(tr("0 (cosmetic pen)"));
 #endif

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

     penStyleComboBox = new QComboBox;
     penStyleComboBox->addItem(tr("Solid"), Qt::SolidLine);
     penStyleComboBox->addItem(tr("Dash"), Qt::DashLine);
     penStyleComboBox->addItem(tr("Dot"), Qt::DotLine);
     penStyleComboBox->addItem(tr("Dash Dot"), Qt::DashDotLine);
     penStyleComboBox->addItem(tr("Dash Dot Dot"), Qt::DashDotDotLine);
     penStyleComboBox->addItem(tr("None"), Qt::NoPen);

     penStyleLabel = new QLabel(tr("&Pen Style:"));
     penStyleLabel->setBuddy(penStyleComboBox);

     penCapComboBox = new QComboBox;
     penCapComboBox->addItem(tr("Flat"), Qt::FlatCap);
     penCapComboBox->addItem(tr("Square"), Qt::SquareCap);
     penCapComboBox->addItem(tr("Round"), Qt::RoundCap);

     penCapLabel = new QLabel(tr("Pen &Cap:"));
     penCapLabel->setBuddy(penCapComboBox);

     penJoinComboBox = new QComboBox;
     penJoinComboBox->addItem(tr("Miter"), Qt::MiterJoin);
     penJoinComboBox->addItem(tr("Bevel"), Qt::BevelJoin);
     penJoinComboBox->addItem(tr("Round"), Qt::RoundJoin);

     penJoinLabel = new QLabel(tr("Pen &Join:"));
     penJoinLabel->setBuddy(penJoinComboBox);

     brushStyleComboBox = new QComboBox;
     brushStyleComboBox->addItem(tr("Linear Gradient"),
             Qt::LinearGradientPattern);
     brushStyleComboBox->addItem(tr("Radial Gradient"),
             Qt::RadialGradientPattern);
     brushStyleComboBox->addItem(tr("Conical Gradient"),
             Qt::ConicalGradientPattern);
     brushStyleComboBox->addItem(tr("Texture"), Qt::TexturePattern);
     brushStyleComboBox->addItem(tr("Solid"), Qt::SolidPattern);
     brushStyleComboBox->addItem(tr("Horizontal"), Qt::HorPattern);
     brushStyleComboBox->addItem(tr("Vertical"), Qt::VerPattern);
     brushStyleComboBox->addItem(tr("Cross"), Qt::CrossPattern);
     brushStyleComboBox->addItem(tr("Backward Diagonal"), Qt::BDiagPattern);
     brushStyleComboBox->addItem(tr("Forward Diagonal"), Qt::FDiagPattern);
     brushStyleComboBox->addItem(tr("Diagonal Cross"), Qt::DiagCrossPattern);
     brushStyleComboBox->addItem(tr("Dense 1"), Qt::Dense1Pattern);
     brushStyleComboBox->addItem(tr("Dense 2"), Qt::Dense2Pattern);
     brushStyleComboBox->addItem(tr("Dense 3"), Qt::Dense3Pattern);
     brushStyleComboBox->addItem(tr("Dense 4"), Qt::Dense4Pattern);
     brushStyleComboBox->addItem(tr("Dense 5"), Qt::Dense5Pattern);
     brushStyleComboBox->addItem(tr("Dense 6"), Qt::Dense6Pattern);
     brushStyleComboBox->addItem(tr("Dense 7"), Qt::Dense7Pattern);
     brushStyleComboBox->addItem(tr("None"), Qt::NoBrush);

     brushStyleLabel = new QLabel(tr("&Brush:"));
     brushStyleLabel->setBuddy(brushStyleComboBox);

     otherOptionsLabel = new QLabel(tr("Options:"));
     antialiasingCheckBox = new QCheckBox(tr("&Antialiasing"));
     transformationsCheckBox = new QCheckBox(tr("&Transformations"));

     connect(shapeComboBox, SIGNAL(activated(int)),
             this, SLOT(shapeChanged()));
     connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
             this, SLOT(penChanged()));
     connect(penStyleComboBox, SIGNAL(activated(int)),
             this, SLOT(penChanged()));
     connect(penCapComboBox, SIGNAL(activated(int)),
             this, SLOT(penChanged()));
     connect(penJoinComboBox, SIGNAL(activated(int)),
             this, SLOT(penChanged()));
     connect(brushStyleComboBox, SIGNAL(activated(int)),
             this, SLOT(brushChanged()));
     connect(antialiasingCheckBox, SIGNAL(toggled(bool)),
             renderArea, SLOT(setAntialiased(bool)));
     connect(transformationsCheckBox, SIGNAL(toggled(bool)),
             renderArea, SLOT(setTransformed(bool)));

     QGridLayout *mainLayout = new QGridLayout;
 #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
     mainLayout->setSizeConstraint(QLayout::SetNoConstraint);
 #endif
     mainLayout->setColumnStretch(0, 1);
     mainLayout->setColumnStretch(3, 1);
     mainLayout->addWidget(renderArea, 0, 0, 1, 4);
     mainLayout->addWidget(shapeLabel, 2, 0, Qt::AlignRight);
     mainLayout->addWidget(shapeComboBox, 2, 1);
     mainLayout->addWidget(penWidthLabel, 3, 0, Qt::AlignRight);
     mainLayout->addWidget(penWidthSpinBox, 3, 1);
     mainLayout->addWidget(penStyleLabel, 4, 0, Qt::AlignRight);
     mainLayout->addWidget(penStyleComboBox, 4, 1);
     mainLayout->addWidget(penCapLabel, 3, 2, Qt::AlignRight);
     mainLayout->addWidget(penCapComboBox, 3, 3);
     mainLayout->addWidget(penJoinLabel, 2, 2, Qt::AlignRight);
     mainLayout->addWidget(penJoinComboBox, 2, 3);
     mainLayout->addWidget(brushStyleLabel, 4, 2, Qt::AlignRight);
     mainLayout->addWidget(brushStyleComboBox, 4, 3);
     mainLayout->addWidget(otherOptionsLabel, 5, 0, Qt::AlignRight);
     mainLayout->addWidget(antialiasingCheckBox, 5, 1, 1, 1, Qt::AlignRight);
     mainLayout->addWidget(transformationsCheckBox, 5, 2, 1, 2, Qt::AlignRight);
     setLayout(mainLayout);

     shapeChanged();
     penChanged();
     brushChanged();
     antialiasingCheckBox->setChecked(true);

     setWindowTitle(tr("Basic Drawing"));
 }

 void Window::shapeChanged()
 {
     RenderArea::Shape shape = RenderArea::Shape(shapeComboBox->itemData(
             shapeComboBox->currentIndex(), IdRole).toInt());
     renderArea->setShape(shape);
 }

 void Window::penChanged()
 {
     int width = penWidthSpinBox->value();
     Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(
             penStyleComboBox->currentIndex(), IdRole).toInt());
     Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(
             penCapComboBox->currentIndex(), IdRole).toInt());
     Qt::PenJoinStyle join = Qt::PenJoinStyle(penJoinComboBox->itemData(
             penJoinComboBox->currentIndex(), IdRole).toInt());

     renderArea->setPen(QPen(Qt::blue, width, style, cap, join));
 }

 void Window::brushChanged()
 {
     Qt::BrushStyle style = Qt::BrushStyle(brushStyleComboBox->itemData(
             brushStyleComboBox->currentIndex(), IdRole).toInt());

     if (style == Qt::LinearGradientPattern) {
         QLinearGradient linearGradient(0, 0, 100, 100);
         linearGradient.setColorAt(0.0, Qt::white);
         linearGradient.setColorAt(0.2, Qt::green);
         linearGradient.setColorAt(1.0, Qt::black);
         renderArea->setBrush(linearGradient);
     } else if (style == Qt::RadialGradientPattern) {
         QRadialGradient radialGradient(50, 50, 50, 70, 70);
         radialGradient.setColorAt(0.0, Qt::white);
         radialGradient.setColorAt(0.2, Qt::green);
         radialGradient.setColorAt(1.0, Qt::black);
         renderArea->setBrush(radialGradient);
     } else if (style == Qt::ConicalGradientPattern) {
         QConicalGradient conicalGradient(50, 50, 150);
         conicalGradient.setColorAt(0.0, Qt::white);
         conicalGradient.setColorAt(0.2, Qt::green);
         conicalGradient.setColorAt(1.0, Qt::black);
         renderArea->setBrush(conicalGradient);
     } else if (style == Qt::TexturePattern) {
         renderArea->setBrush(QBrush(QPixmap(":/images/brick.png")));
     } else {
         renderArea->setBrush(QBrush(Qt::green, style));
     }
 }

© 2015 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.

Documentation sources may be obtained from www.qt-project.org.


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. Privacy Policy