#!/usr/bin/env python

#############################################################################
##
## Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
##
## This file is part of the example classes of the Qt Toolkit.
##
## This file may be used under the terms of the GNU General Public
## License version 2.0 as published by the Free Software Foundation
## and appearing in the file LICENSE.GPL included in the packaging of
## this file.  Please review the following information to ensure GNU
## General Public Licensing requirements will be met:
## http://www.trolltech.com/products/qt/opensource.html
##
## If you are unsure which license is appropriate for your use, please
## review the following information:
## http://www.trolltech.com/products/qt/licensing.html or contact the
## sales department at sales@trolltech.com.
##
## This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
## WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
##
#############################################################################

from PyQt4 import QtCore, QtGui


class PyAnalogClock(QtGui.QWidget):

    """PyAnalogClock(QtGui.QWidget)
    
    Provides an analog clock custom widget with signals, slots and properties.
    The implementation is based on the Analog Clock example provided with both
    Qt and PyQt.
    """
    
    # We use this special class variable to define two signals that are used
    # to inform other components of changes to the clock's time and time zone.
    # Signals that are declared in this way are emitted in the same way as any
    # other signal.
    
    __pyqtSignals__ = ("timeChanged(QTime)", "timeZoneChanged(int)")
    
    def __init__(self, parent = None):
    
        QtGui.QWidget.__init__(self, parent)
        self.timeZoneOffset = 0
        
        timer = QtCore.QTimer(self)
        self.connect(timer, QtCore.SIGNAL("timeout()"), self, QtCore.SLOT("update()"))
        self.connect(timer, QtCore.SIGNAL("timeout()"), self.updateTime)
        timer.start(1000)

        self.setWindowTitle(QtCore.QObject.tr(self, "Analog Clock"))
        self.resize(200, 200)
        
        self.hourHand = QtGui.QPolygon([
            QtCore.QPoint(7, 8),
            QtCore.QPoint(-7, 8),
            QtCore.QPoint(0, -40)
        ])
        self.minuteHand = QtGui.QPolygon([
            QtCore.QPoint(7, 8),
            QtCore.QPoint(-7, 8),
            QtCore.QPoint(0, -70)
        ])

        self.hourColor = QtGui.QColor(0, 127, 0)
        self.minuteColor = QtGui.QColor(0, 127, 127, 191)

    def paintEvent(self, event):

        side = min(self.width(), self.height())
        time = QtCore.QTime.currentTime()
        time = time.addSecs(self.timeZoneOffset * 3600)

        painter = QtGui.QPainter()
        painter.begin(self)
        painter.setRenderHint(QtGui.QPainter.Antialiasing)
        painter.translate(self.width() / 2, self.height() / 2)
        painter.scale(side / 200.0, side / 200.0)

        painter.setPen(QtCore.Qt.NoPen)
        painter.setBrush(QtGui.QBrush(self.hourColor))

        painter.save()
        painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)))
        painter.drawConvexPolygon(self.hourHand)
        painter.restore()

        painter.setPen(self.hourColor)

        for i in range(0, 12):
            painter.drawLine(88, 0, 96, 0)
            painter.rotate(30.0)

        painter.setPen(QtCore.Qt.NoPen)
        painter.setBrush(QtGui.QBrush(self.minuteColor))

        painter.save()
        painter.rotate(6.0 * (time.minute() + time.second() / 60.0))
        painter.drawConvexPolygon(self.minuteHand)
        painter.restore()

        painter.setPen(QtGui.QPen(self.minuteColor))

        for j in range(0, 60):
            if (j % 5) != 0:
                painter.drawLine(92, 0, 96, 0)
            painter.rotate(6.0)

        painter.end()
    
    def minimumSizeHint(self):
    
        return QtCore.QSize(50, 50)
    
    def sizeHint(self):
    
        return QtCore.QSize(100, 100)
    
    def updateTime(self):
    
        self.emit(QtCore.SIGNAL("timeChanged(QTime)"), QtCore.QTime.currentTime())
    
    # The timeZone property is implemented using the getTimeZone() getter
    # method, the setTimeZone() setter method, and the resetTimeZone() method.
    
    # The getter just returns the internal time zone value.
    def getTimeZone(self):
    
        return self.timeZoneOffset
    
    # The setTimeZone() method is also defined to be a slot. The @pyqtSignature
    # decorator is used to tell PyQt which argument type the method expects,
    # and is especially useful when you want to define slots with the same
    # name that accept different argument types.
    
    @QtCore.pyqtSignature("setTimeZone(int)")
    def setTimeZone(self, value):
    
        self.timeZoneOffset = value
        self.emit(QtCore.SIGNAL("timeZoneChanged(int)"), value)
        self.update()
    
    # Qt's property system supports properties that can be reset to their
    # original values. This method enables the timeZone property to be reset.
    def resetTimeZone(self):
    
        self.timeZoneOffset = 0
        self.emit(QtCore.SIGNAL("timeZoneChanged(int)"), 0)
        self.update()
    
    # Qt-style properties are defined differently to Python's properties.
    # To declare a property, we call pyqtProperty() to specify the type and,
    # in this case, getter, setter and resetter methods.
    timeZone = QtCore.pyqtProperty("int", getTimeZone, setTimeZone, resetTimeZone)


if __name__ == "__main__":

    import sys

    app = QtGui.QApplication(sys.argv)
    clock = PyAnalogClock()
    clock.show()
    sys.exit(app.exec_())
