PyQt5使用pyqtgraph绘制波形图
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主程序代码
import sys
import numpy as np
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import pyqtgraph as pg
from ui_demo02 import Ui_MainWindow
class GraphDemowWindow(QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
super(GraphDemowWindow, self).__init__(parent)
self.setupUi(self)
pg.setConfigOptions(antialias=True) # 设置开启抗锯齿
self.drawGraphicsLayoutWidget()
self.drawPoltWidget()
# 在QWidget控件提升为pyqtgraph.GraphicsLayoutWidget类型的控件上画波形
def drawGraphicsLayoutWidget(self):
# pyqtgraph.GraphicsLayoutWidget 支持的方法有：
# ['nextRow', 'nextCol', 'nextColumn', 'addPlot', 'addViewBox', 'addItem', 'getItem', 'addLayout', 'addLabel', 'removeItem', 'itemIndex', 'clear']
self.graphicsLayout.clear() # 清除
plt1 = self.graphicsLayout.addPlot(y=np.random.normal(size=1000), title="温度")
plt2 = self.graphicsLayout.addPlot(y=np.random.normal(size=500), title="湿度")
self.graphicsLayout.nextRow() # 图像坐标换行
plt3 = self.graphicsLayout.addPlot(y=np.random.normal(size=800), title="光照度")
plt4 = self.graphicsLayout.addPlot(y=np.random.normal(size=800), title="紫外线强度")
# 在QWidget控件提升为pyqtgraph.PlotWidget类型的控件上画波形
def drawPoltWidget(self):
# pyqtgraph.PlotWidget 支持的方法有：
# ['addItem', 'removeItem', 'autoRange', 'clear', 'setAxisItems', 'setXRange',
# 'setYRange', 'setRange', 'setAspectLocked', 'setMouseEnabled',
# 'setXLink', 'setYLink', 'enableAutoRange', 'disableAutoRange',
# 'setLimits', 'register', 'unregister', 'viewRect']
# pen = pg.mkPen(255, 0, 0)
# pen = pg.mkPen("#ff0000")
# pen = pg.mkPen(color='r', width=3)
pen = pg.mkPen({'color':'0F0', 'width':1})
plt1 = self.graphPlot.plot(np.random.normal(size=100), pen=pen, symbolBrush=(255, 0, 0), symbolPen=(0, 255, 0))
pen2 = pg.mkPen(color="F00", width=1)
plt2 = self.graphPlot.plot(np.random.normal(size=50), pen=pen2, symbolBrush=(0, 255, 0), symbolPen=(255, 0, 0))
self.graphPlot.setAntialiasing(True)
self.graphPlot.setBackground("#ffffff")
if __name__ == "__main__":
app = QApplication(sys.argv)
win = GraphDemowWindow()
win.show()
sys.exit(app.exec_())
UI界面设计
包含了两个QWidget控件也可以是QGraphicsView控件类型。
两个控件分别提升为pyqtgraph.GraphicsLayoutWidget类型和pyqtgraph.PlotWidget
GraphicsLayoutWidget类型通过addPlot方法添加波形数据，每个波形都占有独立的区域。
plt1 = self.graphicsLayout.addPlot(y=np.random.normal(size=1000), title=“温度”)
plt2 = self.graphicsLayout.addPlot(y=np.random.normal(size=500), title=“湿度”)
PlotWidget类型通过plot方法添加波形数据，同一控件内多个plot占用同一窗口区域。
pen2 = pg.mkPen(color=“F00”, width=1)
plt2 = self.graphPlot.plot(np.random.normal(size=50), pen=pen2, symbolBrush=(0, 255, 0), symbolPen=(255, 0, 0))
控件提升
UI设计文件
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1139</width>
<height>844</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<widget class="GraphicsLayoutWidget" name="graphicsLayout" native="true">
<property name="geometry">
<rect>
<x>30</x>
<y>20</y>
<width>1091</width>
<height>361</height>
</rect>
</property>
</widget>
<widget class="PlotWidget" name="graphPlot" native="true">
<property name="geometry">
<rect>
<x>30</x>
<y>390</y>
<width>1091</width>
<height>411</height>
</rect>
</property>
</widget>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1139</width>
<height>26</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<customwidgets>
<customwidget>
<class>GraphicsLayoutWidget</class>
<extends>QWidget</extends>
<header location="global">pyqtgraph.h</header>
<container>1</container>
</customwidget>
<customwidget>
<class>PlotWidget</class>
<extends>QWidget</extends>
<header location="global">pyqtgraph.h</header>
<container>1</container>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>UI生成文件
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'd:\project\python\pyqtgraph\PygraphDemo2\demo02.ui'
#
# Created by: PyQt5 UI code generator 5.15.7
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again. Do not edit this file unless you know what you are doing.
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(1139, 844)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.graphicsLayout = GraphicsLayoutWidget(self.centralwidget)
self.graphicsLayout.setGeometry(QtCore.QRect(30, 20, 1091, 361))
self.graphicsLayout.setObjectName("graphicsLayout")
self.graphPlot = PlotWidget(self.centralwidget)
self.graphPlot.setGeometry(QtCore.QRect(30, 390, 1091, 411))
self.graphPlot.setObjectName("graphPlot")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 1139, 26))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
from pyqtgraph import GraphicsLayoutWidget, PlotWidget运行效果
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