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/****************************************************************************
**
** 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 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 <QRasterWindow>
#include <QPainter>
#include <QGuiApplication>
#include <QMatrix4x4>
#include <QTimer>
static QPainterPath painterPathForTriangle()
{
static const QPointF bottomLeft(-1.0, -1.0);
static const QPointF top(0.0, 1.0);
static const QPointF bottomRight(1.0, -1.0);
QPainterPath path(bottomLeft);
path.lineTo(top);
path.lineTo(bottomRight);
path.closeSubpath();
return path;
}
class PaintedWindow : public QRasterWindow
{
Q_OBJECT
public:
PaintedWindow()
{
m_view.lookAt(QVector3D(3,1,1),
QVector3D(0,0,0),
QVector3D(0,1,0));
m_timer.setInterval(16);
connect(&m_timer, SIGNAL(timeout()), this, SLOT(update()));
m_timer.start();
}
protected:
void paintEvent(QPaintEvent *)
{
QPainter p(this);
p.fillRect(QRect(0,0,width(),height()),Qt::gray);
p.setWorldTransform(m_window_matrix.toTransform());
QMatrix4x4 mvp = m_projection * m_view * m_model;
p.setTransform(mvp.toTransform(), true);
p.fillPath(painterPathForTriangle(), m_brush);
m_model.rotate(1, 0, 1, 0);
}
void resizeEvent(QResizeEvent *)
{
m_window_matrix = QTransform();
m_window_matrix.translate(width() / 2.0, height() / 2.0);
m_window_matrix.scale(width() / 2.0, -height() / 2.0);
m_projection.setToIdentity();
m_projection.perspective(45.f, qreal(width()) / qreal(height()), 0.1f, 100.f);
QLinearGradient gradient(QPointF(-1,-1), QPointF(1,1));
gradient.setColorAt(0, Qt::red);
gradient.setColorAt(1, Qt::green);
m_brush = QBrush(gradient);
}
private:
QMatrix4x4 m_window_matrix;
QMatrix4x4 m_projection;
QMatrix4x4 m_view;
QMatrix4x4 m_model;
QBrush m_brush;
QTimer m_timer;
};
int main (int argc, char **argv)
{
QGuiApplication app(argc, argv);
PaintedWindow window;
window.create();
window.show();
return app.exec();
}
#include "main.moc"
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