73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
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"""
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This example demonstrates many of the 2D plotting capabilities
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in pyqtgraph. All of the plots may be panned/scaled by dragging with
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the left/right mouse buttons. Right click on any plot to show a context menu.
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"""
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import serial, struct
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import numpy as np
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import pyqtgraph as pg
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from pyqtgraph.Qt import QtCore
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if __name__ == '__main__':
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ser = serial.Serial("COM2", 115200, timeout=250) # 打开COM17，将波特率配置为115200，其余参数使用默认值
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if ser.isOpen(): # 判断串口是否成功打开
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print("打开串口成功。")
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# print(ser.name) # 输出串口号
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else:
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print("打开串口失败。")
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app = pg.mkQApp("Plotting Example")
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#mw = QtWidgets.QMainwin1dow()
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#mw.resize(800,800)
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win1 = pg.GraphicsLayoutWidget(show=True, title="Basic plotting examples")
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win1.resize(1000,600)
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win1.setWindowTitle('pyqtgraph example: Plotting1')
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# Enable antialiasing for prettier plots
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pg.setConfigOptions(antialias=True)
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win1.nextRow()
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win1.nextCol()
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p6 = win1.addPlot(title="Updating plot")
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curve = p6.plot(pen=None, symbolBrush=(255,0,0), symbolPen='w', col=3, row=3,rowspan=2, colspan=5)
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lr = pg.LinearRegionItem([400,700])
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lr.setZValue(-10)
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p6.addItem(lr)
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data = np.zeros(1024)
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# points = int(np.random.random()*1024)
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points = bytearray()
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ptr = 0
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def update():
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global curve, data, ptr, p6, ser, points
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points += ser.read_all()
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if len(points) > 2:
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for i in range(len(points)//2):
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data[struct.unpack('>H', points[2*i:2*i+2])[0]>>6] += 1
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points = points[2*int(len(points)/2):]
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curve.setData(data)
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if ptr == 0:
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p6.enableAutoRange('xy', True) ## stop auto-scaling after the first data set is plotted
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ptr += 1
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timer = QtCore.QTimer()
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timer.timeout.connect(update)
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timer.start(250)
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win1.nextCol()
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win1.nextRow()
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p9 = win1.addPlot(title="Zoom on selected region", col=1, row=3,rowspan=3, colspan=1)
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p9.plot(data, symbolBrush=(255,0,0), symbolPen='w')
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def updatePlot():
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p9.setXRange(*lr.getRegion(), padding=0)
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def updateRegion():
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lr.setRegion(p9.getViewBox().viewRange()[0])
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lr.sigRegionChanged.connect(updatePlot)
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p9.sigXRangeChanged.connect(updateRegion)
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updatePlot()
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# win2 = pg.GraphicsLayoutWidget(show=True, title="Basic plotting examples")
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# win2.resize(1000,600)
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# win2.setWindowTitle('pyqtgraph example: Plotting')
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pg.exec()
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ser.close()
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