AGG缓冲液

使用backend agg以RGBA缓冲区的形式访问图形画布，将其转换为数组，并将其传递给Pillow进行渲染。

import numpy as np

from matplotlib.backends.backend_agg import FigureCanvasAgg
import matplotlib.pyplot as plt

plt.plot([1, 2, 3])

canvas = plt.gcf().canvas

agg = canvas.switch_backends(FigureCanvasAgg)
agg.draw()
X = np.asarray(agg.buffer_rgba())

# Pass off to PIL.
from PIL import Image
im = Image.fromarray(X)

# Uncomment this line to display the image using ImageMagick's `display` tool.
# im.show()