Matplotlib – Textbox Widgets
Last Updated :
17 Feb, 2022
In this article, we are going to see matplotlib’s textbox widget. Matplotlib is a plotting library for the Python programming language. In this article, we will try to plot a graph for different powers(e.g. t^2, t^3, t^9, etc.) using textbox widget.
The Textbox is a widget that accepts input from the user. Input can also be formulas so that we can generate a graph based on those formulas. To use this widget we use TextBox() function.
It accepts two parameters
- Figure i.e. graph to use.
- Text to display with textbox i.e. Label to textBox.
Below is the implementation of this widget:
Python
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import TextBox
fig, ax = plt.subplots()
fig.subplots_adjust(bottom = 0.2 )
t = np.arange( - 4.0 , 4.0 , 0.01 )
l, = ax.plot(t, np.zeros_like(t), lw = 2 )
def visualizeGraph(expr):
ydata = eval (expr)
l.set_ydata(ydata)
ax.relim()
ax.autoscale_view()
plt.draw()
graphBox = fig.add_axes([ 0.1 , 0.05 , 0.8 , 0.075 ])
txtBox = TextBox(graphBox, "Plot: " )
txtBox.on_submit(visualizeGraph)
txtBox.set_val( "t**5" )
plt.show()
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Output:
Explanation:
In the above program, we created a graph for t2 as by default graph. In txtBox labelled as Plot: we can enter the formula we want to view the graph for.
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