81 lines
2.8 KiB
Python
81 lines
2.8 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Created on 2021/5/13
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@author: Irony
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@site: https://pyqt.site , https://github.com/PyQt5
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@email: 892768447@qq.com
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@file: CpuLineChart
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@description:
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"""
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import sys
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from PyQt5.QtChart import QChartView, QChart, QSplineSeries, QDateTimeAxis, QValueAxis
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from PyQt5.QtCore import Qt, QTimer, QDateTime, QPointF
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from PyQt5.QtGui import QPainter, QPen, QColor
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from PyQt5.QtWidgets import QApplication
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from psutil import cpu_percent
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class CpuLineChart(QChart):
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def __init__(self, *args, **kwargs):
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super(CpuLineChart, self).__init__(*args, **kwargs)
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self.m_count = 10
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# 隐藏图例
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self.legend().hide()
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self.m_series = QSplineSeries(self)
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# 设置画笔
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self.m_series.setPen(QPen(QColor('#3B8CFF'), 2, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
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self.addSeries(self.m_series)
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# x轴
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self.m_axisX = QDateTimeAxis(self)
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self.m_axisX.setTickCount(self.m_count + 1) # 设置刻度数量
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self.m_axisX.setFormat('hh:mm:ss') # 设置时间显示格式
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now = QDateTime.currentDateTime() # 前10秒到现在
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self.m_axisX.setRange(now.addSecs(-self.m_count), now)
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self.addAxis(self.m_axisX, Qt.AlignBottom)
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self.m_series.attachAxis(self.m_axisX)
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# y轴
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self.m_axisY = QValueAxis(self)
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self.m_axisY.setLabelFormat('%d') # 设置文本格式
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self.m_axisY.setMinorTickCount(4) # 设置小刻度线的数目
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self.m_axisY.setTickCount(self.m_count + 1)
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self.m_axisY.setRange(0, 100)
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self.addAxis(self.m_axisY, Qt.AlignLeft)
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self.m_series.attachAxis(self.m_axisY)
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# 填充11个初始点，注意x轴 需要转为秒的时间戳
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self.m_series.append(
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[QPointF(now.addSecs(-i).toMSecsSinceEpoch(), 0) for i in range(self.m_count, -1, -1)])
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# 定时器获取数据
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self.m_timer = QTimer()
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self.m_timer.timeout.connect(self.update_data)
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self.m_timer.start(1000)
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def update_data(self):
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value = cpu_percent()
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now = QDateTime.currentDateTime()
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self.m_axisX.setRange(now.addSecs(-self.m_count), now) # 重新调整x轴的时间范围
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# 获取原来的所有点,去掉第一个并追加新的一个
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points = self.m_series.pointsVector()
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points.pop(0)
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points.append(QPointF(now.toMSecsSinceEpoch(), value))
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# 替换法速度更快
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self.m_series.replace(points)
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if __name__ == '__main__':
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app = QApplication(sys.argv)
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chart = CpuLineChart()
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chart.setTitle('cpu')
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# chart.setAnimationOptions(QChart.SeriesAnimations)
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view = QChartView(chart)
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view.setRenderHint(QPainter.Antialiasing) # 抗锯齿
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view.resize(800, 600)
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view.show()
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sys.exit(app.exec_())
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