【pyqtgraph绘图】案例-动态的正余弦波形图

【pyqtgraph绘图】案例-动态的正余弦波形图

先看一个简单的小例子：

完整代码：

import numpy as np

import pyqtgraph as pg

import sys

from PyQt5.QtWidgets import QWidget,QApplication,QFrame,QGridLayout,QVBoxLayout

class Example(QWidget):

    def __init__(self):

        super(Example, self).__init__()

        self.initUI()

        self.generate_image()

    def initUI(self):

        self.setGeometry(200,200,1000,800)

        self.setWindowTitle("实时刷新正余弦波形图")

        self.gridLayout = QGridLayout(self)

        self.frame = QFrame(self)

        self.frame.setFrameShape(QFrame.Panel)

        self.frame.setFrameShadow(QFrame.Plain)

        self.frame.setLineWidth(2)

        self.frame.setStyleSheet("background-color:rgb(0,255,255);")

        self.gridLayout.addWidget(self.frame,0,0,1,2)

        self.setLayout(self.gridLayout)

    def generate_image(self):

        verticalLayout = QVBoxLayout(self.frame)

        win = pg.GraphicsLayoutWidget(self.frame)

        verticalLayout.addWidget(win)

        p = win.addPlot(title="动态波形图")

        p.showGrid(x=True,y=True)

        p.setLabel(axis="left",text="Amplitude / V")

        p.setLabel(axis="bottom",text="t / s")

        p.setTitle("y = sin(x)")

        p.addLegend()

        # mkpen('y', width=3, style=QtCore.Qt.DashLine)

        self.curve1 = p.plot(pen=pg.mkPen("r",width=2),name="y1")　　#设置pen 格式

        self.Fs = 1024.0 #采样频率

        self.N = 1024    #采样点数

        self.f0 = 4.0    #信号频率

        self.pha = 0     #初始相位

        self.t = np.arange(self.N) / self.Fs    #时间向量 1*1024的矩阵

        self.curve1.setData(self.t, np.sin(8 * np.pi * self.t + self.pha * np.pi / 180.0))

if __name__ == '__main__':

    app = QApplication(sys.argv)

    ex = Example()

    ex.show()

    sys.exit(app.exec_())

实时刷新正余弦波形的例子

下面举一个复杂一点的例子，这个例子在一个波形图上实时连续刷新两条曲线，分别为正弦曲线和余弦曲线，运行结果的动态图如下：

效果如下：

完整代码：

import numpy as np

import pyqtgraph as pg

import sys

from PyQt5.QtWidgets import QWidget,QApplication,QFrame,QGridLayout,QLabel,QPushButton,QVBoxLayout

from PyQt5.QtCore import Qt,QTimer

class Example(QWidget):

    def __init__(self):

        super(Example, self).__init__()

        self.initUI()

        self.generate_image()

    def initUI(self):

        self.setGeometry(200,200,1000,800)

        self.setWindowTitle("实时刷新正余弦波形图")

        self.gridLayout = QGridLayout(self)

        self.frame = QFrame(self)

        self.frame.setFrameShape(QFrame.Panel)

        self.frame.setFrameShadow(QFrame.Plain)

        self.frame.setLineWidth(2)

        self.frame.setStyleSheet("background-color:rgb(0,255,255);")

        self.label = QLabel(self)

        self.label.setText("正弦函数&余弦函数")

        self.label.setAlignment(Qt.AlignCenter)

        self.button = QPushButton(self)

        self.button.setText("生成波形图")

        self.button.clicked.connect(self.btnClick)

        self.gridLayout.addWidget(self.frame,0,0,1,2)

        self.gridLayout.addWidget(self.label,1,0,1,1)

        self.gridLayout.addWidget(self.button,1,1,1,1)

        self.setLayout(self.gridLayout)

    def generate_image(self):

        verticalLayout = QVBoxLayout(self.frame)

        win = pg.GraphicsLayoutWidget(self.frame)

        verticalLayout.addWidget(win)

        p = win.addPlot(title="动态波形图")

        p.showGrid(x=True,y=True)

        p.setLabel(axis="left",text="Amplitude / V")

        p.setLabel(axis="bottom",text="t / s")

        p.setTitle("y1 = sin(x)  y2 = cos(x)")

        p.addLegend()

        self.curve1 = p.plot(pen="r",name="y1")

        self.curve2 = p.plot(pen="g",name="y2")

        self.Fs = 1024.0 #采样频率

        self.N = 1024    #采样点数

        self.f0 = 4.0    #信号频率

        self.pha = 0     #初始相位

        self.t = np.arange(self.N) / self.Fs    #时间向量 1*1024的矩阵

    def plotData(self):

        self.pha += 10

        self.curve1.setData(self.t , np.sin(8 * np.pi  * self.t+ self.pha * np.pi/180.0))

        self.curve2.setData(self.t , np.cos(8 * np.pi  * self.t + self.pha * np.pi/180.0))

    def btnClick(self):

        self.button.setText("再次点击加速！")

        timer = QTimer(self)

        timer.timeout.connect(self.plotData)

        timer.start(100)

if __name__ == '__main__':

    app = QApplication(sys.argv)

    ex = Example()

    ex.show()

    sys.exit(app.exec_())