CPU动态折线图

QtChart/CpuLineChart.py

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

QtChart/README.md

@@ -16,6 +16,7 @@
   - [横向百分比柱状图表](#13横向百分比柱状图表)
   - [散点图表](#14散点图表)
   - [图表主题动画](#15图表主题动画)
+  - [CPU动态折线图](#16CPU动态折线图)
 
 ## 1、折线图
 [运行 LineChart.py](LineChart.py)
@@ -95,3 +96,10 @@
 [运行 ChartThemes.py](ChartThemes.py)
 
 ![ChartThemes](ScreenShot/ChartThemes.gif)
+
+## 16、CPU动态折线图
+[运行 CpuLineChart.py](CpuLineChart.py)
+
+通过设置x轴的时间范围并替换y点达到动态移动效果
+
+![CpuLineChart](ScreenShot/CpuLineChart.png)

README.md

@@ -174,6 +174,7 @@ https://pyqt.site 论坛是专门针对PyQt5学习和提升开设的网站，分
   - [横向百分比柱状图表](QtChart/HorizontalPercentBarChart.py)
   - [散点图表](QtChart/ScatterChart.py)
   - [图表主题动画](QtChart/ChartThemes.py)
+  - [CPU动态折线图](QtChart/CpuLineChart.py)
 
 - [QtDataVisualization](QtDataVisualization)
   - [柱状图3D](QtDataVisualization/BarsVisualization.py)