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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| #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" |