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PyQt实现钟表效果

注意:本程序在Python3.3+PyQt5测试通过

主要目的是为了锻炼使用Qt绘图的相关知识

'''
Created on 2013-7-2
@author: badboy
Email:lucky.haiyu@gmail.com
QQ:43831266
'''
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
 
class clockForm(QWidget):
    def __init__(self,parent=None):
        super(clockForm,self).__init__(parent)
        self.setWindowTitle("Clock")
        self.timer=QTimer()
        #设置窗口计时器
        self.timer.timeout.connect(self.update)
        self.timer.start(1000)
         
    def paintEvent(self,event):
        painter=QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
         
        #设置表盘中的文字字体
        font=QFont("Times",6)
        fm=QFontMetrics(font)
        fontRect=fm.boundingRect("99")#获取绘制字体的矩形范围
         
        #分针坐标点
        minPoints=[QPointF(50,25),
                   QPointF(48,50),
                   QPointF(52,50)]
         
        #时钟坐标点
        hourPoints=[QPointF(50,35),
                   QPointF(48,50),
                   QPointF(52,50)]
         
        side=min(self.width(),self.height())
        painter.setViewport((self.width()-side)/2,(self.height()-side)/2,
                            side,side)#始终处于窗口中心位置显示
         
         
        #设置QPainter的坐标系统,无论窗体大小如何变化,
        #窗体左上坐标为(0,0),右下坐标为(100,100),
        #因此窗体中心坐标为(50,50)
        painter.setWindow(0,0,100,100)
         
        #绘制表盘,使用环形渐变色
        niceBlue=QColor(150,150,200)
        haloGrident=QRadialGradient(50,50,50,50,50)
        haloGrident.setColorAt(0.0,Qt.lightGray)
        haloGrident.setColorAt(0.5,Qt.darkGray)
        haloGrident.setColorAt(0.9,Qt.white)
        haloGrident.setColorAt(1.0,niceBlue)
        painter.setBrush(haloGrident)
        painter.setPen(QPen(Qt.darkGray,1))
        painter.drawEllipse(0,0,100,100)
         
         
        transform=QTransform()
         
        #绘制时钟为0的字,以及刻度
        painter.setPen(QPen(Qt.black,1.5))
        fontRect.moveCenter(QPoint(50,10+fontRect.height()/2))
        painter.setFont(font)
        painter.drawLine(50,2,50,8)#
        painter.drawText(QRectF(fontRect),Qt.AlignHCenter|Qt.AlignTop,"0")
         
        for i in range(1,12):
            transform.translate(50, 50)
            transform.rotate(30)
            transform.translate(-50,-50)
            painter.setWorldTransform(transform)
            painter.drawLine(50,2,50,8)
            painter.drawText(QRectF(fontRect),Qt.AlignHCenter|Qt.AlignTop,"%d" % i)
         
        transform.reset()
         
        #绘制分钟刻度线
        painter.setPen(QPen(Qt.blue,1))
        for i in range(1,60): 
            transform.translate(50,50)
            transform.rotate(6)
            transform.translate(-50,-50)
            if i%5!=0:
                painter.setWorldTransform(transform)
                painter.drawLine(50,2,50,5)
                 
                 
        transform.reset()
         
        #获取当前时间
        currentTime=QTime().currentTime()
        hour=currentTime.hour() if currentTime.hour()<12 else currentTime.hour()-12
        minite=currentTime.minute()
        second=currentTime.second()
         
        #获取所需旋转角度
        hour_angle=hour*30.0+(minite/60.0)*30.0
        minite_angle=(minite/60.0)*360.0
        second_angle=second*6.0
         
        #时针
        transform.translate(50,50)
        transform.rotate(hour_angle)
        transform.translate(-50,-50)
        painter.setWorldTransform(transform)
        painter.setPen(Qt.NoPen)
        painter.setBrush(QBrush(Qt.darkRed))
        painter.drawPolygon(QPolygonF(hourPoints))
         
        transform.reset()
         
        #分针
        transform.translate(50,50)
        transform.rotate(minite_angle)
        transform.translate(-50,-50)
        painter.setWorldTransform(transform)
        painter.setBrush(QBrush(Qt.darkGreen))
        painter.drawPolygon(QPolygonF(minPoints))
         
        transform.reset()
        #秒针
        transform.translate(50,50)
        transform.rotate(second_angle)
        transform.translate(-50,-50)
        painter.setWorldTransform(transform)
        painter.setPen(QPen(Qt.darkCyan,1))
        painter.drawLine(50,50,50,20)   
 
if __name__=="__main__":
    import sys
    app=QApplication(sys.argv)
    form=clockForm()
    form.show()
    app.exec_()


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