Matplotlib 3.0 Cookbook

How to do it...

The following are the steps to implement the TextBox widget:

1. Define the figure and axes, and adjust the space at the bottom to accommodate TextBox:

fig, ax = plt.subplots()plt.subplots_adjust(bottom=0.2)

2. Prepare the data to be plotted initially:

x = np.arange(-5.0, 5.0, 0.01)y = x ** 5

3. Plot the data:

l, = plt.plot(x, y, lw=2)

4. Define the callback function to be executed when the new expression in TextBox is submitted:

def submit(text):    ydata = eval(text)    l.set_ydata(ydata)    ax.set_ylim(np.min(ydata), np.max(ydata))    plt.draw()

5. Define the axes and initial_text required for TextBox implementation:

axbox = plt.axes([0.1, 0.05, 0.8, 0.075])initial_text = "x ** 5"

6. Instantiate the TextBox object:

text_box = TextBox(axbox, ...