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# 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())
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