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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QRasterWindow>
#include <QPainter>
#include <QPainterPath>
#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, &QTimer::timeout, this, qOverload<>(&PaintedWindow::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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