绘制波形

设置plot的pen属性的几种方法，通过画笔可以设置绘制图像的颜色、线宽等参数：

• pen=(255,0,0)
• pen=pg.mkPen(color=‘b’, width=5)
• pen=pg.mkPen({‘color’:‘FF0’, ‘width’: 2})

import sys
import os

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

import pyqtgraph as pg
import numpy as np

pg.systemInfo()

data = np.random.normal(size=10000)
f1 = pg.plot(title='波形图1', y=data, pen=(255,0,0)) 
f1.setBackground('w')

f2 = pg.plot(title='波形图2', y=np.random.normal(size=50), pen=pg.mkPen(color='b', width=5))
f2.setBackground('g')

f3 = pg.plot(title='波形图3', y=np.random.normal(size=500),pen=pg.mkPen({'color':'FF0', 'width': 2}))
f3.setBackground('b')

if __name__ == "__main__":
    pg.QtGui.QGuiApplication.exec_()

每个plot绘制的波形图都是一个独立的应用程序窗口：

设置symbolBrush，symbolPen属性：

import sys
import numpy as np
import pyqtgraph as pg


pg.plot(np.random.normal(size=100), pen=(255, 255, 0),  symbolBrush=(0, 255, 0), symbolPen=(255, 0, 0))

if __name__ == "__main__":
    pg.QtGui.QGuiApplication.exec_()

绘制图像

import sys
import numpy as np
import pyqtgraph as pg

pg.image(np.random.normal(size=(500, 500)))

if __name__ == "__main__":
    pg.QtGui.QGuiApplication.exec_()

一个窗口内绘制多个波形图

import sys
import numpy as np
import pyqtgraph as pg



win = pg.GraphicsLayoutWidget(show=True)
win.resize(800, 600)
win.setWindowTitle("pyqtgraph")

pg.setConfigOptions(antialias=True)

p1 = win.addPlot(title="波形1")
p1.plot(np.random.normal(size=1000), pen=(255, 0, 0), name='Red curve')
p1.plot(np.random.normal(size=1000)+5, pen=(0, 255, 0), name='Green curve')
p1.plot(np.random.normal(size=1000)+10, pen=(0, 0,  255), name='Blue curve')

p2 = win.addPlot(title="波形2")
p2.plot(np.random.normal(size=100), symbolPen=(255, 0, 0), symbolBrush=(0,255,0))
p2.setLabel('left', "温度", units='C')
p2.setLabel('bottom', "时间", units='S')

win.nextRow() # 切换到下一行

p3 = win.addPlot(title="波形3")
p3.plot(np.random.normal(size=900))

p4 = win.addPlot(title="波形4")
p4.plot(np.random.normal(size=20))
p4.setLabel('left', "Y Axis", units='A')
p4.setLabel('bottom', "X Axis", units='V')

if __name__ == "__main__":
    pg.QtGui.QGuiApplication.exec_()