#!/usr/bin/env python ############################################################################# ## ## Copyright (C) 2010 Riverbank Computing Limited. ## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ## All rights reserved. ## ## This file is part of the examples of PyQt. ## ## $QT_BEGIN_LICENSE:BSD$ ## 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 Nokia Corporation and its Subsidiary(-ies) 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." ## $QT_END_LICENSE$ ## ############################################################################# from PyQt4 import QtCore, QtGui class CircleWidget(QtGui.QWidget): def __init__(self, parent=None): super(CircleWidget, self).__init__(parent) self.floatBased = False self.antialiased = False self.frameNo = 0 self.setBackgroundRole(QtGui.QPalette.Base) self.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding) def setFloatBased(self, floatBased): self.floatBased = floatBased self.update() def setAntialiased(self, antialiased): self.antialiased = antialiased self.update() def minimumSizeHint(self): return QtCore.QSize(50, 50) def sizeHint(self): return QtCore.QSize(180, 180) def nextAnimationFrame(self): self.frameNo += 1 self.update() def paintEvent(self, event): painter = QtGui.QPainter(self) painter.setRenderHint(QtGui.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(QtGui.QPen(QtGui.QColor(0, diameter / 2, 127, alpha), 3)) if self.floatBased: painter.drawEllipse(QtCore.QRectF(-diameter / 2.0, -diameter / 2.0, diameter, diameter)) else: painter.drawEllipse(QtCore.QRect(-diameter / 2, -diameter / 2, diameter, diameter)) class Window(QtGui.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 = QtGui.QGridLayout() layout.addWidget(aliasedLabel, 0, 1) layout.addWidget(antialiasedLabel, 0, 2) layout.addWidget(intLabel, 1, 0) layout.addWidget(floatLabel, 2, 0) timer = QtCore.QTimer(self) self.circleWidgets = [] for i in range(2): self.circleWidgets.append([None]*2) for j in range(2): self.circleWidgets[i][j] = CircleWidget() self.circleWidgets[i][j].setAntialiased(j != 0) self.circleWidgets[i][j].setFloatBased(i != 0) timer.timeout.connect(self.circleWidgets[i][j].nextAnimationFrame) layout.addWidget(self.circleWidgets[i][j], i + 1, j + 1) timer.start(100) self.setLayout(layout) self.setWindowTitle("Concentric Circles") def createLabel(self, text): label = QtGui.QLabel(text) label.setAlignment(QtCore.Qt.AlignCenter) label.setMargin(2) label.setFrameStyle(QtGui.QFrame.Box | QtGui.QFrame.Sunken) return label if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) window = Window() window.show() sys.exit(app.exec_())