cf6522e5d7
Task-number: QTBUG-106893 Change-Id: Icf9a40403029c6973167f468f51b2dbdc365a848 Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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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, &QTimer::timeout, this, qOverload<>(&PaintedWindow::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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