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#!/usr/bin/env python
"""
polygonwidget.py
A PyQt custom widget example for Qt Designer.
Copyright (C) 2006 David Boddie <david@boddie.org.uk>
Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
import math
from PyQt4 import QtCore, QtGui
class PolygonWidget(QtGui.QWidget):
"""PolygonWidget(QtGui.QWidget)
Provides a custom widget to display a polygon with properties and slots
that can be used to customize its appearance.
"""
def __init__(self, parent=None):
super(PolygonWidget, self).__init__(parent)
self._sides = 5
self._innerRadius = 20
self._outerRadius = 50
self._angle = 0
self.createPath()
self._innerColor = QtGui.QColor(255, 255, 128)
self._outerColor = QtGui.QColor(255, 0, 128)
self.createGradient()
def paintEvent(self, event):
painter = QtGui.QPainter()
painter.begin(self)
painter.setRenderHint(QtGui.QPainter.Antialiasing)
painter.setBrush(QtGui.QBrush(QtGui.QColor(192, 192, 255)))
painter.drawRect(event.rect())
painter.translate(self.width()/2.0, self.height()/2.0)
painter.rotate(self._angle)
painter.setBrush(QtGui.QBrush(self.gradient))
painter.drawPath(self.path)
painter.end()
def sizeHint(self):
return QtCore.QSize(2*self._outerRadius + 20, 2*self._outerRadius + 20)
def createPath(self):
self.path = QtGui.QPainterPath()
angle = 2*math.pi/self._sides
self.path.moveTo(self._outerRadius, 0)
for step in range(1, self._sides + 1):
self.path.lineTo(
self._innerRadius * math.cos((step - 0.5) * angle),
self._innerRadius * math.sin((step - 0.5) * angle)
)
self.path.lineTo(
self._outerRadius * math.cos(step * angle),
self._outerRadius * math.sin(step * angle)
)
self.path.closeSubpath()
def createGradient(self):
center = QtCore.QPointF(0, 0)
self.gradient = QtGui.QRadialGradient(center, self._outerRadius, center)
self.gradient.setColorAt(0.5, QtGui.QColor(self._innerColor))
self.gradient.setColorAt(1.0, QtGui.QColor(self._outerColor))
# The angle property is implemented using the getAngle() and setAngle()
# methods.
def getAngle(self):
return self._angle
# The setAngle() setter method is also a slot.
@QtCore.pyqtSlot(int)
def setAngle(self, angle):
self._angle = min(max(0, angle), 360)
self.update()
angle = QtCore.pyqtProperty(int, getAngle, setAngle)
# The innerRadius property is implemented using the getInnerRadius() and
# setInnerRadius() methods.
def getInnerRadius(self):
return self._innerRadius
# The setInnerRadius() setter method is also a slot.
@QtCore.pyqtSlot(int)
def setInnerRadius(self, radius):
self._innerRadius = radius
self.createPath()
self.createGradient()
self.update()
innerRadius = QtCore.pyqtProperty(int, getInnerRadius, setInnerRadius)
# The outerRadius property is implemented using the getOuterRadius() and
# setOuterRadius() methods.
def getOuterRadius(self):
return self._outerRadius
# The setOuterRadius() setter method is also a slot.
@QtCore.pyqtSlot(int)
def setOuterRadius(self, radius):
self._outerRadius = radius
self.createPath()
self.createGradient()
self.update()
outerRadius = QtCore.pyqtProperty(int, getOuterRadius, setOuterRadius)
# The numberOfSides property is implemented using the getNumberOfSides()
# and setNumberOfSides() methods.
def getNumberOfSides(self):
return self._sides
# The setNumberOfSides() setter method is also a slot.
@QtCore.pyqtSlot(int)
def setNumberOfSides(self, sides):
self._sides = max(3, sides)
self.createPath()
self.update()
numberOfSides = QtCore.pyqtProperty(int, getNumberOfSides, setNumberOfSides)
# The innerColor property is implemented using the getInnerColor() and
# setInnerColor() methods.
def getInnerColor(self):
return self._innerColor
def setInnerColor(self, color):
self._innerColor = max(3, color)
self.createGradient()
self.update()
innerColor = QtCore.pyqtProperty(QtGui.QColor, getInnerColor, setInnerColor)
# The outerColor property is implemented using the getOuterColor() and
# setOuterColor() methods.
def getOuterColor(self):
return self._outerColor
def setOuterColor(self, color):
self._outerColor = color
self.createGradient()
self.update()
outerColor = QtCore.pyqtProperty(QtGui.QColor, getOuterColor, setOuterColor)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
window = PolygonWidget()
window.show()
sys.exit(app.exec_())
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