Matplotlib 3.0 Cookbook

How to do it...

The following are the steps to implement the logic:

1. Define the GUI application and the window for plotting the figure:

qApp = QtWidgets.QApplication(sys.argv)window = QtWidgets.QMainWindow()

2. Define the figure, canvas and toolbar:

fig = Figure(figsize=(8, 6), dpi=100)canvas = FigureCanvas(fig)toolbar = NavigationToolbar(canvas, window)

3. Define the axes and data, and plot the polar graph:

ax = fig.add_subplot(111,projection='polar')theta = np.arange(0., 2., 1./180.)*np.piax.plot(theta, 5*np.cos(4*theta))

4. Define the callback function for the Slider:

def update():    n=n_slider.value()    ax.clear()    ax.plot(theta, 5*np.cos(n*theta))    fig.canvas.draw()

5. Define the Slider widget and connect it with the corresponding callback function: ...