qt 6.5.1 original

examples/qpa/qrasterwindow/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(qrasterwindow LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/qpa/qrasterwindow")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui)
+
+qt_standard_project_setup()
+
+qt_add_executable(qrasterwindow
+    main.cpp
+)
+
+set_target_properties(qrasterwindow PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(qrasterwindow PRIVATE
+    Qt6::Core
+    Qt6::Gui
+)
+
+install(TARGETS qrasterwindow
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/qpa/qrasterwindow/main.cpp

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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, 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"

examples/qpa/qrasterwindow/qrasterwindow.pro

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+SOURCES += main.cpp
+
+target.path = $$[QT_INSTALL_EXAMPLES]/qpa/qrasterwindow
+INSTALLS += target