Add the QtGui analogclock example

Uses the ready-made QRasterWindow instead of the QWindow with backing
store of the C++ version for simplicity.

Task-number: PYSIDE-841
Change-Id: Ib0146b1563405b97f694cc53b382c1188061d6af
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

3 files changed, 88 insertions, 0 deletions

diff --git a/examples/gui/analogclock/analogclock.pyproject b/examples/gui/analogclock/analogclock.pyproject
new file mode 100644
index 000000000..cc7a74a34
--- /dev/null
+++ b/examples/gui/analogclock/analogclock.pyproject
@@ -0,0 +1,3 @@
+{
+    "files": ["main.py"]
+}
diff --git a/examples/gui/analogclock/doc/analogclock.rst b/examples/gui/analogclock/doc/analogclock.rst
new file mode 100644
index 000000000..a1ede41dd
--- /dev/null
+++ b/examples/gui/analogclock/doc/analogclock.rst
@@ -0,0 +1,8 @@
+Analog Clock Window Example
+===========================
+
+The Analog Clock Window example shows how to draw the contents of
+a custom window.
+
+This example demonstrates how the transformation and scaling
+features of QPainter can be used to make drawing easier.
diff --git a/examples/gui/analogclock/main.py b/examples/gui/analogclock/main.py
new file mode 100644
index 000000000..12303cd1d
--- /dev/null
+++ b/examples/gui/analogclock/main.py
@@ -0,0 +1,77 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import sys
+
+from PySide6.QtCore import QPoint, QTimer, QTime, Qt
+from PySide6.QtGui import (QColor, QGradient, QGuiApplication, QPainter,
+                           QPolygon, QRasterWindow)
+
+"""Simplified PySide6 port of the gui/analogclock example from Qt v6.x"""
+
+
+class AnalogClockWindow(QRasterWindow):
+
+    def __init__(self):
+        super().__init__()
+        self.setTitle("Analog Clock")
+        self.resize(200, 200)
+
+        self._timer = QTimer(self)
+        self._timer.timeout.connect(self.update)
+        self._timer.start(1000)
+
+        self._hour_hand = QPolygon([QPoint(7, 8), QPoint(-7, 8), QPoint(0, -40)])
+        self._minute_hand = QPolygon([QPoint(7, 8), QPoint(-7, 8), QPoint(0, -70)])
+
+        self._hour_color = QColor(127, 0, 127)
+        self._minute_color = QColor(0, 127, 127, 191)
+
+    def paintEvent(self, e):
+        with QPainter(self) as p:
+            self.render(p)
+
+    def render(self, p):
+        width = self.width()
+        height = self.height()
+        p.fillRect(0, 0, width, height, QGradient.NightFade)
+
+        p.setRenderHint(QPainter.Antialiasing)
+        p.translate(width / 2, height / 2)
+
+        side = min(width, height)
+        p.scale(side / 200.0, side / 200.0)
+        p.setPen(Qt.NoPen)
+        p.setBrush(self._hour_color)
+        time = QTime.currentTime()
+
+        p.save()
+        p.rotate(30.0 * ((time.hour() + time.minute() / 60.0)))
+        p.drawConvexPolygon(self._hour_hand)
+        p.restore()
+        p.setPen(self._hour_color)
+
+        for i in range(0, 12):
+            p.drawLine(88, 0, 96, 0)
+            p.rotate(30.0)
+
+        p.setPen(Qt.NoPen)
+        p.setBrush(self._minute_color)
+
+        p.save()
+        p.rotate(6.0 * (time.minute() + time.second() / 60.0))
+        p.drawConvexPolygon(self._minute_hand)
+        p.restore()
+        p.setPen(self._minute_color)
+
+        for j in range(0, 60):
+            if (j % 5) != 0:
+                p.drawLine(92, 0, 96, 0)
+            p.rotate(6.0)
+
+
+if __name__ == "__main__":
+    app = QGuiApplication(sys.argv)
+    clock = AnalogClockWindow()
+    clock.show()
+    sys.exit(app.exec())