Pyqt 时时CPU使用情况

借鉴代码来自：https://github.com/hgoldfish/quickpanel
实现代码:
  1 # -*- coding:utf-8 -*-
  2 from __future__ import print_function
  3 from __future__ import unicode_literals
  4 from __future__ import division
  5 from __future__ import absolute_import
  6 
  7 import ctypes, sys
  8 import ctypes.wintypes
  9 from PyQt4.QtCore import QPoint, QRect, QTimer, Qt
 10 from PyQt4.QtGui import QPainter, QPen, QPolygon, QApplication, QWidget
 11 
 12 GetSystemTimes = ctypes.windll.kernel32.GetSystemTimes
 13 class FILETIME(ctypes.Structure):
 14     _fields_ = [("dwLowDateTime", ctypes.wintypes.DWORD), ("dwHighDateTime", ctypes.wintypes.DWORD)]
 15 
 16     def __int__(self):
 17         # print(self.dwHighDateTime)
 18         return self.dwHighDateTime * 0x100000000 + self.dwLowDateTime
 19 class MachineLoad:
 20     _instance = None
 21 
 22     @staticmethod
 23     def getInstance():
 24         if MachineLoad._instance is None:
 25             MachineLoad._instance = MachineLoad()
 26         return MachineLoad._instance
 27 
 28     def __init__(self):
 29         idle, kernel, user = FILETIME(), FILETIME(), FILETIME()
 30         GetSystemTimes(ctypes.byref(idle), ctypes.byref(kernel), ctypes.byref(user))
 31         self.idle0, self.kernel0, self.user0 = int(idle), int(kernel), int(user)
 32 
 33     def getLoad(self):
 34         idle, kernel, user = FILETIME(), FILETIME(), FILETIME()
 35         GetSystemTimes(ctypes.byref(idle), ctypes.byref(kernel), ctypes.byref(user))
 36         idle1, kernel1, user1 = int(idle), int(kernel), int(user)
 37         a, b, c = idle1 - self.idle0, kernel1 - self.kernel0, user1 - self.user0
 38         self.idle0, self.kernel0, self.user0 = idle1, kernel1, user1
 39         if (b + c) == 0:
 40             return 1
 41         return (b + c - a) / (b + c)
 42 
 43 class MachineLoadWidget(QWidget):
 44     def __init__(self, parent):
 45         QWidget.__init__(self, parent)
 46         self.timer = QTimer()
 47         self.timer.timeout.connect(self.collectMachineLoad)
 48         self.loads = []
 49         self.maxLength = 400
 50         self.pointDistance = 5 #每点之间的间隔
 51         self.updateInterval = 500 #更新的时间间隔
 52         self.timer.setInterval(self.updateInterval)
 53         self.timer.start()
 54         self.machineLoad = MachineLoad.getInstance()
 55         self.boxWidth = 60
 56 
 57     def collectMachineLoad(self):
 58         rate = self.machineLoad.getLoad()
 59         self.loads.insert(0, rate)
 60         if len(self.loads) > self.maxLength:
 61             self.loads.pop(- 1)
 62         if self.isVisible():
 63             self.update()
 64 
 65     def paintEvent(self, event):
 66         QWidget.paintEvent(self, event)
 67         width, height = self.width(), self.height()
 68         polygon = QPolygon()
 69         for i, rate in enumerate(self.loads):
 70             x = width - i * self.pointDistance
 71             y = height - rate * height
 72             if x < self.boxWidth:
 73                 break
 74             polygon.append(QPoint(x, y))
 75         painter = QPainter(self)
 76         pen = QPen()
 77         pen.setColor(Qt.darkGreen)
 78         painter.setPen(pen)
 79         painter.setRenderHint(QPainter.Antialiasing, True)
 80         #画网格
 81         painter.setOpacity(0.5)
 82         gridSize = self.pointDistance * 4
 83         deltaX = (width - self.boxWidth) % gridSize + self.boxWidth
 84         deltaY = height % gridSize
 85         for i in range(int(width / gridSize)):
 86             x = deltaX + gridSize * i
 87             painter.drawLine(x, 0, x, height)
 88         for j in range(int(height / gridSize)):
 89             y = j * gridSize + deltaY
 90             painter.drawLine(self.boxWidth, y, width, y)
 91         #画折线
 92         pen.setColor(Qt.darkCyan)
 93         pen.setWidth(2)
 94         painter.setPen(pen)
 95         painter.setOpacity(1)
 96         painter.drawPolyline(polygon)
 97         #画展示框
 98         if len(self.loads) > 0:
 99             rate = self.loads[0]
100         else:
101             rate = 1.0
102         rect1 = QRect(4, height * 0.05, self.boxWidth - 9, height * 0.7)
103         rect2 = QRect(4, height * 0.8, self.boxWidth - 9, height * 0.2)
104         centerX = int(rect1.width() / 2) + 1
105         pen.setWidth(1)
106         for i in range(rect1.height()):
107             if i % 4 == 0:
108                 continue
109             if (rect1.height() - i) / rect1.height() > rate:
110                 pen.setColor(Qt.darkGreen)
111             else:
112                 pen.setColor(Qt.green)
113             painter.setPen(pen)
114             for j in range(rect1.width()):
115                 if centerX - 1 <= j <= centerX + 1:
116                     continue
117                 painter.drawPoint(rect1.x() + j, rect1.y() + i)
118         pen.setColor(Qt.black)
119         painter.setPen(pen)
120         painter.drawText(rect2, Qt.AlignHCenter | Qt.AlignVCenter, str(int(rate * 100)) + "%")
121 
122 
123 
124 class CPUstatus(QWidget):
125     def __init__(self):
126         super(CPUstatus, self).__init__()
127         self.resize(200,200)
128         self.factory = MachineLoadWidget(self)
129         self.factory.resize(200, 200)
130 
131 
132 if __name__ == "__main__":
133     app = QApplication(sys.argv)
134     platform = CPUstatus()
135     platform.show()
136     sys.exit(app.exec_())
效果：