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 modulesimport numpy as npimport matplotlib.pyplot as pltfrom matplotlib.widgets import TextBox# Adjust illustrationfig, 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)# Function to plot graph # according to expressiondef visualizeGraph(expr): ydata = eval(expr) l.set_ydata(ydata) ax.relim() ax.autoscale_view() plt.draw()# Adding TextBox to graphgraphBox = fig.add_axes([0.1, 0.05, 0.8, 0.075])txtBox = TextBox(graphBox, "Plot: ")txtBox.on_submit(visualizeGraph)txtBox.set_val("t**5")# Plot graphplt.show() |
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.
