139 lines
4.5 KiB
C++
139 lines
4.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QRasterWindow>
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#include <QPainter>
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#include <QPainterPath>
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#include <QGuiApplication>
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#include <QMatrix4x4>
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#include <QTimer>
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static QPainterPath painterPathForTriangle()
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{
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static const QPointF bottomLeft(-1.0, -1.0);
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static const QPointF top(0.0, 1.0);
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static const QPointF bottomRight(1.0, -1.0);
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QPainterPath path(bottomLeft);
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path.lineTo(top);
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path.lineTo(bottomRight);
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path.closeSubpath();
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return path;
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}
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class PaintedWindow : public QRasterWindow
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{
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Q_OBJECT
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public:
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PaintedWindow()
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{
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m_view.lookAt(QVector3D(3,1,1),
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QVector3D(0,0,0),
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QVector3D(0,1,0));
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m_timer.setInterval(16);
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connect(&m_timer, SIGNAL(timeout()), this, SLOT(update()));
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m_timer.start();
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}
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protected:
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void paintEvent(QPaintEvent *)
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{
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QPainter p(this);
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p.fillRect(QRect(0,0,width(),height()),Qt::gray);
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p.setWorldTransform(m_window_matrix.toTransform());
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QMatrix4x4 mvp = m_projection * m_view * m_model;
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p.setTransform(mvp.toTransform(), true);
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p.fillPath(painterPathForTriangle(), m_brush);
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m_model.rotate(1, 0, 1, 0);
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}
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void resizeEvent(QResizeEvent *)
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{
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m_window_matrix = QTransform();
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m_window_matrix.translate(width() / 2.0, height() / 2.0);
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m_window_matrix.scale(width() / 2.0, -height() / 2.0);
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m_projection.setToIdentity();
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m_projection.perspective(45.f, qreal(width()) / qreal(height()), 0.1f, 100.f);
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QLinearGradient gradient(QPointF(-1,-1), QPointF(1,1));
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gradient.setColorAt(0, Qt::red);
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gradient.setColorAt(1, Qt::green);
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m_brush = QBrush(gradient);
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}
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private:
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QMatrix4x4 m_window_matrix;
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QMatrix4x4 m_projection;
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QMatrix4x4 m_view;
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QMatrix4x4 m_model;
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QBrush m_brush;
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QTimer m_timer;
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};
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int main (int argc, char **argv)
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{
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QGuiApplication app(argc, argv);
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PaintedWindow window;
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window.create();
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window.show();
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return app.exec();
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}
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#include "main.moc"
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