#220 Custom figure subclasses

import matplotlib.pyplot as plt
from matplotlib.figure import Figure
import numpy as np
class WatermarkFigure(Figure):
    """A figure with a text watermark."""
    def __init__(self, *args, watermark=None, **kwargs):
        super().__init__(*args, **kwargs)
        if watermark is not None:
            bbox = dict(boxstyle='square', lw=3, ec='gray',
                        fc=(0.9, 0.9, .9, .5), alpha=0.5)
            self.text(0.5, 0.5, watermark,
                      ha='center', va='center', rotation=30,
                      fontsize=40, color='gray', alpha=0.5, bbox=bbox)

x = np.linspace(-3, 3, 201)
y = np.tanh(x) + 0.1 * np.cos(5 * x)
plt.figure(FigureClass=WatermarkFigure, watermark='draft')
plt.plot(x, y)
plt.savefig('ex220.png', dpi=72)
plt.show()