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50
51#include <QRasterWindow>
52#include <QPainter>
53#include <QPainterPath>
54#include <QGuiApplication>
55#include <QMatrix4x4>
56#include <QTimer>
57
58static QPainterPath painterPathForTriangle()
59{
60 static const QPointF bottomLeft(-1.0, -1.0);
61 static const QPointF top(0.0, 1.0);
62 static const QPointF bottomRight(1.0, -1.0);
63
64 QPainterPath path(bottomLeft);
65 path.lineTo(top);
66 path.lineTo(bottomRight);
67 path.closeSubpath();
68 return path;
69}
70
71class PaintedWindow : public QRasterWindow
72{
73 Q_OBJECT
74
75public:
76 PaintedWindow()
77 {
78 m_view.lookAt(QVector3D(3,1,1),
79 QVector3D(0,0,0),
80 QVector3D(0,1,0));
81 m_timer.setInterval(16);
82 connect(&m_timer, SIGNAL(timeout()), this, SLOT(update()));
83 m_timer.start();
84 }
85
86protected:
87 void paintEvent(QPaintEvent *)
88 {
89 QPainter p(this);
90 p.fillRect(QRect(0,0,width(),height()),Qt::gray);
91
92 p.setWorldTransform(m_window_matrix.toTransform());
93
94 QMatrix4x4 mvp = m_projection * m_view * m_model;
95 p.setTransform(mvp.toTransform(), true);
96
97 p.fillPath(painterPathForTriangle(), m_brush);
98
99 m_model.rotate(1, 0, 1, 0);
100 }
101
102 void resizeEvent(QResizeEvent *)
103 {
104 m_window_matrix = QTransform();
105 m_window_matrix.translate(width() / 2.0, height() / 2.0);
106 m_window_matrix.scale(width() / 2.0, -height() / 2.0);
107
108 m_projection.setToIdentity();
109 m_projection.perspective(45.f, qreal(width()) / qreal(height()), 0.1f, 100.f);
110
111 QLinearGradient gradient(QPointF(-1,-1), QPointF(1,1));
112 gradient.setColorAt(0, Qt::red);
113 gradient.setColorAt(1, Qt::green);
114
115 m_brush = QBrush(gradient);
116 }
117
118private:
119 QMatrix4x4 m_window_matrix;
120 QMatrix4x4 m_projection;
121 QMatrix4x4 m_view;
122 QMatrix4x4 m_model;
123 QBrush m_brush;
124 QTimer m_timer;
125};
126
127int main (int argc, char **argv)
128{
129 QGuiApplication app(argc, argv);
130
131 PaintedWindow window;
132 window.create();
133 window.show();
134
135 return app.exec();
136}
137
138#include "main.moc"
139