pyqtgraph 的使用记录

- 日理万妓 2023-06-17 12:52 5阅读 0赞

例子1：

from PyQt5 import QtWidgets, uic
    from pyqtgraph import PlotWidget, plot
    import pyqtgraph as pg
    import sys  # We need sys so that we can pass argv to QApplication
    import os
    class MainWindow(QtWidgets.QMainWindow):
        def __init__(self, *args, **kwargs):
            super(MainWindow, self).__init__(*args, **kwargs)
            self.graphWidget = pg.PlotWidget()
            self.setCentralWidget(self.graphWidget)
            hour = [1,2,3,4,5,6,7,8,9,10]
            temperature = [30,32,34,32,33,31,29,32,35,45]
            self.graphWidget.setBackground('w')
            pen = pg.mkPen(color=(255, 0, 0))
            self.graphWidget.plot(hour, temperature, pen=pen)
           
    
    def main():
        app = QtWidgets.QApplication(sys.argv)
        main = MainWindow()
        main.show()
        sys.exit(app.exec_())
    
    
    if __name__ == '__main__':
        main()

运行结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70][]

例子2：

import pyqtgraph as pg
    import numpy as np
    import array
    app = pg.mkQApp()#建立app
    win = pg.GraphicsWindow()#建立窗口
    win.setWindowTitle(u'pyqtgraph逐点画波形图')
    win.resize(800, 500)#小窗口大小
    data = array.array('d') #可动态改变数组的大小,double型数组
    historyLength = 1000#横坐标长度
    p = win.addPlot()#把图p加入到窗口中
    p.showGrid(x=True, y=True)#把X和Y的表格打开
    p.setRange(xRange=[0,historyLength], yRange=[-1.2, 1.2], padding=0)
    p.setLabel(axis='left', text='y / V')#靠左
    p.setLabel(axis='bottom', text     ='x / point')
    p.setTitle('y = sin(x)')#表格的名字
    curve = p.plot()#绘制一个图形
    idx = 0
    def plotData():
        global idx#内部作用域想改变外部域变量
        tmp = np.sin(np.pi / 50 * idx)
        if len(data)<historyLength:
            data.append(tmp)
        else:
            data[:-1] = data[1:]#前移
            data[-1] = tmp
        curve.setData(data)
        idx += 1
    
    timer = pg.QtCore.QTimer()
    timer.timeout.connect(plotData)#定时调用plotData函数
    timer.start(50)#多少ms调用一次
    app.exec_()

运行结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191128234109807.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191128234258416.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ==,size_16,color_FFFFFF,t_70