Note
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Textbox#
The Textbox widget lets users interactively provide text input, including
formulas. In this example, the plot is updated using the on_submit method.
This method triggers the execution of the submit function when the
user presses enter in the textbox or leaves the textbox.
Note: The matplotlib.widgets.TextBox widget is different from the following
static elements: Annotations and
Placing text boxes.
import matplotlib.pyplot as plt import numpy as np from matplotlib.widgets import TextBox fig, ax = plt.subplots() fig.subplots_adjust(bottom=0.2) t = np.arange(-2.0, 2.0, 0.001) l, = ax.plot(t, np.zeros_like(t), lw=2) def submit(expression): """ Update the plotted function to the new math *expression*. *expression* is a string using "t" as its independent variable, e.g. "t ** 3". """ ydata = eval(expression, {'np': np}, {'t': t}) l.set_ydata(ydata) ax.relim() ax.autoscale_view() plt.draw() axbox = fig.add_axes((0.1, 0.05, 0.8, 0.075)) text_box = TextBox(axbox, "Evaluate", textalignment="center") text_box.on_submit(submit) text_box.set_val("t ** 2") # Trigger `submit` with the initial string. plt.show()
References
The use of the following functions, methods, classes and modules is shown in this example: