1 files changed, 147 insertions, 0 deletions
diff --git a/examples/widgets/painting/concentriccircles.py b/examples/widgets/painting/concentriccircles.py
new file mode 100755
index 000000000..5fecfc0b5
--- /dev/null
+++ b/examples/widgets/painting/concentriccircles.py
@@ -0,0 +1,147 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## Copyright (C) 2013 Riverbank Computing Limited.
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the widgets/painting/concentriccircles example from Qt v5.x, originating from PyQt"""
+
+from PySide2.QtCore import QRect, QRectF, QSize, Qt, QTimer
+from PySide2.QtGui import QColor, QPainter, QPalette, QPen
+from PySide2.QtWidgets import (QApplication, QFrame, QGridLayout, QLabel,
+        QSizePolicy, QWidget)
+
+
+class CircleWidget(QWidget):
+    def __init__(self, parent=None):
+        super(CircleWidget, self).__init__(parent)
+
+        self.floatBased = False
+        self.antialiased = False
+        self.frameNo = 0
+
+        self.setBackgroundRole(QPalette.Base)
+        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+
+    def setFloatBased(self, floatBased):
+        self.floatBased = floatBased
+        self.update()
+
+    def setAntialiased(self, antialiased):
+        self.antialiased = antialiased
+        self.update()
+
+    def minimumSizeHint(self):
+        return QSize(50, 50)
+
+    def sizeHint(self):
+        return QSize(180, 180)
+
+    def nextAnimationFrame(self):
+        self.frameNo += 1
+        self.update()
+
+    def paintEvent(self, event):
+        painter = QPainter(self)
+        painter.setRenderHint(QPainter.Antialiasing, self.antialiased)
+        painter.translate(self.width() / 2, self.height() / 2)
+
+        for diameter in range(0, 256, 9):
+            delta = abs((self.frameNo % 128) - diameter / 2)
+            alpha = 255 - (delta * delta) / 4 - diameter
+            if alpha > 0:
+                painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3))
+
+                if self.floatBased:
+                    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(Window, self).__init__()
+
+        aliasedLabel = self.createLabel("Aliased")
+        antialiasedLabel = self.createLabel("Antialiased")
+        intLabel = self.createLabel("Int")
+        floatLabel = self.createLabel("Float")
+
+        layout = QGridLayout()
+        layout.addWidget(aliasedLabel, 0, 1)
+        layout.addWidget(antialiasedLabel, 0, 2)
+        layout.addWidget(intLabel, 1, 0)
+        layout.addWidget(floatLabel, 2, 0)
+
+        timer = QTimer(self)
+
+        for i in range(2):
+            for j in range(2):
+                w = CircleWidget()
+                w.setAntialiased(j != 0)
+                w.setFloatBased(i != 0)
+
+                timer.timeout.connect(w.nextAnimationFrame)
+
+                layout.addWidget(w, i + 1, j + 1)
+
+        timer.start(100)
+        self.setLayout(layout)
+
+        self.setWindowTitle("Concentric Circles")
+
+    def createLabel(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_())