1 files changed, 109 insertions, 0 deletions
diff --git a/examples/widgets/painting/concentriccircles/concentriccircles.py b/examples/widgets/painting/concentriccircles/concentriccircles.py
new file mode 100644
index 000000000..d2c60178f
--- /dev/null
+++ b/examples/widgets/painting/concentriccircles/concentriccircles.py
@@ -0,0 +1,109 @@
+# Copyright (C) 2013 Riverbank Computing Limited.
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+"""PySide6 port of the widgets/painting/concentriccircles example from Qt v5.x, originating
+   from PyQt"""
+
+from PySide6.QtCore import QRect, QRectF, QSize, Qt, QTimer
+from PySide6.QtGui import QColor, QPainter, QPalette, QPen
+from PySide6.QtWidgets import (QApplication, QFrame, QGridLayout, QLabel,
+                               QSizePolicy, QWidget)
+
+
+class CircleWidget(QWidget):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+        self._float_based = False
+        self.antialiased = False
+        self._frame_no = 0
+
+        self.setBackgroundRole(QPalette.Base)
+        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+
+    def set_float_based(self, floatBased):
+        self._float_based = floatBased
+        self.update()
+
+    def set_antialiased(self, antialiased):
+        self.antialiased = antialiased
+        self.update()
+
+    def minimumSizeHint(self):
+        return QSize(50, 50)
+
+    def sizeHint(self):
+        return QSize(180, 180)
+
+    def next_animation_frame(self):
+        self._frame_no += 1
+        self.update()
+
+    def paintEvent(self, event):
+        with QPainter(self) as painter:
+            painter.setRenderHint(QPainter.Antialiasing, self.antialiased)
+            painter.translate(self.width() / 2, self.height() / 2)
+
+            for diameter in range(0, 256, 9):
+                delta = abs((self._frame_no % 128) - diameter / 2)
+                alpha = 255 - (delta * delta) / 4 - diameter
+                if alpha > 0:
+                    painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3))
+
+                    if self._float_based:
+                        painter.drawEllipse(QRectF(-diameter / 2.0,
+                                                   -diameter / 2.0, diameter, diameter))
+                    else:
+                        painter.drawEllipse(QRect(-diameter / 2,
+                                                  -diameter / 2, diameter, diameter))
+
+
+class Window(QWidget):
+    def __init__(self):
+        super().__init__()
+
+        aliased_label = self.create_label("Aliased")
+        antialiased_label = self.create_label("Antialiased")
+        int_label = self.create_label("Int")
+        float_label = self.create_label("Float")
+
+        layout = QGridLayout()
+        layout.addWidget(aliased_label, 0, 1)
+        layout.addWidget(antialiased_label, 0, 2)
+        layout.addWidget(int_label, 1, 0)
+        layout.addWidget(float_label, 2, 0)
+
+        timer = QTimer(self)
+
+        for i in range(2):
+            for j in range(2):
+                w = CircleWidget()
+                w.set_antialiased(j != 0)
+                w.set_float_based(i != 0)
+
+                timer.timeout.connect(w.next_animation_frame)
+
+                layout.addWidget(w, i + 1, j + 1)
+
+        timer.start(100)
+        self.setLayout(layout)
+
+        self.setWindowTitle("Concentric Circles")
+
+    def create_label(self, text):
+        label = QLabel(text)
+        label.setAlignment(Qt.AlignCenter)
+        label.setMargin(2)
+        label.setFrameStyle(QFrame.Box | QFrame.Sunken)
+        return label
+
+
+if __name__ == '__main__':
+
+    import sys
+
+    app = QApplication(sys.argv)
+    window = Window()
+    window.show()
+    sys.exit(app.exec())