Matplotlib is a majorly used python comprehensive library for visualization(static, animated, creative & interactive). It provides a wide range of methods for annotating and describing the plot through text. Also, it can wrap the text automatically.
Text is used in a plot for various purposes Aside from describing the plot, the other use for text is to provide general notes and the reader’s attention. Matplotlib provides methods to add text to a plot.
Approach
- Import module
- Create data
- Plot data
- Add text
- Display plot
- text() : This method provides general text to the graph. It adds the text to an arbitrary location.
Syntax :
matplotlib.pyplot.text(x, y, string, fontdict, withdash, **kwargs)
Example :
Python3
import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y = [50, 40, 40, 80, 20] y2 = [80, 20, 20, 50, 60] plt.plot(x, y, 'g', label='BMW', linewidth=5) plt.plot(x, y2, 'c', label='Ferrari', linewidth=5) plt.title('Car details in line plot') plt.ylabel('Distance in kms') plt.xlabel('Days') # Text on Ferrari line plot plt.text(2.5, 23, "Ferrari") # Text on BMW line plot plt.text(2.5, 43, "BMW") plt.legend() |
Output :
- figtext() : figtext() can be used as an alternative of text() method. figtext() helps to place text in any location on the figure. We can also put text outside the Axes of the plot.
Syntax :
matplotlib.pyplot.figtext(x, y, string, fontdict=None, **kwargs)
Example :
Python3
import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y = [50, 40, 40, 80, 20] y2 = [80, 20, 20, 50, 60] plt.plot(x, y, 'g', label='BMW', linewidth=5) plt.plot(x, y2, 'c', label='Ferrari', linewidth=5) plt.title('Car details in line plot') plt.ylabel('Distance in kms') plt.xlabel('Days') plt.figtext(0.4, 0.2, "Ferrari") plt.figtext(0.35, 0.4, "BMW") plt.legend() |
Output :
- annotation(): With the help of these methods we can annotate a point on a plot by adding an arrow.
Syntax :
matplotlib.pyplot.annotate( string, xy, xytext, arrowprops, **kwargs)
Example 1:
Python3
import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y = [50, 40, 40, 80, 20] y2 = [80, 20, 20, 50, 60] plt.plot(x, y, 'g', label='BMW', linewidth=5) plt.plot(x, y2, 'c', label='Ferrari', linewidth=5) plt.title('Car details in line plot') plt.ylabel('Distance in kms') plt.xlabel('Days') # Text on Ferrari line plot plt.annotate('BMW', xy=(2.5, 40), xytext=(3, 55), arrowprops=dict( width=1, headwidth=8, facecolor='black', shrink=0.05)) plt.legend() |
Output :
Example 2: Text box with line wrapping using pyplot.text() :
Python3
import matplotlib.pyplot as plt fig = plt.figure() plt.axis([0, 10, 0, 10]) t = ("Welcome to Lazyroar") plt.text(5, 8, t, fontsize=18, style='oblique', ha='center', va='top', wrap=True) plt.show() |
Output :
We can rotate the text by using rotation parameter.
Example 3:
Python3
import matplotlib.pyplot as plt fig = plt.figure() plt.axis([0, 10, 0, 10]) t = ("Welcome to Lazyroar") plt.text(5, 8, t, fontsize=18, rotation=15, style='oblique', ha='center', va='top', wrap=True) # rotate the text 15 degree. plt.show() |
Output :
