C++/Qt/QPen
Set Dash Pattern for QPen
<source lang="cpp">
Foundations of Qt Development\Chapter07\penpatterns\main.cpp /*
* Copyright (c) 2006-2007, Johan Thelin * * All rights reserved. * * 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 APress 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. * */
- include <QApplication>
- include <QPixmap>
- include <QPainter>
int main( int argc, char **argv ) {
QApplication app( argc, argv ); QPixmap pixmap( 200, 100 ); pixmap.fill( Qt::white ); QPainter painter( &pixmap ); QPen pen( Qt::black ); pen.setStyle( Qt::SolidLine ); painter.setPen( pen ); painter.drawLine( QPoint( 10, 10 ), QPoint( 190, 10 ) ); pen.setStyle( Qt::DashDotLine ); painter.setPen( pen ); painter.drawLine( QPoint( 10, 50 ), QPoint( 190, 50 ) ); pen.setDashPattern( QVector<qreal>() << 1 << 1 << 1 << 1 << 2 << 2 << 2 << 2 << 4 << 4 << 4 << 4 << 8 << 8 << 8 << 8 ); pen.setStyle( Qt::CustomDashLine ); painter.setPen( pen ); painter.drawLine( QPoint( 10, 90 ), QPoint( 190, 90 ) ); pixmap.save( "penpatterns.png" ); return 0;
}
</source>
Set pen for Qt::darkGreen
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the documentation of the Qt Toolkit.
- $QT_BEGIN_LICENSE:LGPL$
- Commercial Usage
- Licensees holding valid Qt Commercial licenses may use this file in
- accordance with the Qt Commercial License Agreement provided with the
- Software or, alternatively, in accordance with the terms contained in
- a written agreement between you and Nokia.
- 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 1.1, 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 have questions regarding the use of this file, please contact
- Nokia at qt-info@nokia.com.
- $QT_END_LICENSE$
-
- /
- include <QtGui>
class MyWidget : public QWidget { public:
MyWidget();
protected:
void paintEvent(QPaintEvent *);
}; MyWidget::MyWidget() {
QPalette palette(MyWidget::palette()); palette.setColor(backgroundRole(), Qt::white); setPalette(palette);
} void MyWidget::paintEvent(QPaintEvent *) {
QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.setPen(Qt::darkGreen); painter.drawRect(1, 2, 6, 4); painter.setPen(Qt::darkGray); painter.drawLine(2, 8, 6, 2);
} int main(int argc, char *argv[]) {
QApplication app(argc, argv); MyWidget widget; widget.show(); return app.exec();
}
</source>