matplotlib - 如何在 matplotlib 中叠加 shapefile

Question

在 matplotlib 中，如何在图外的右上角叠加下面所附的 shapefile(在文件夹中可用)。

Answer 1

banderkat引用的代码:

import matplotlib.pyplot as plt
import Image
import numpy as np

im = Image.open('Jbc4j.jpg')
width = im.size[0]
height = im.size[1]

# We need a float array between 0-1, rather than
# a uint8 array between 0-255
im = np.array(im).astype(np.float) / 255

a = np.random.randint(0,100,100)
b = range(100)
fig = plt.figure(1,figsize=(5, 7), dpi=80, facecolor='w')
ax = fig.add_subplot(111)
ax.scatter(a,b)
fig.canvas.draw()

# With newer (1.0) versions of matplotlib, you can 
# use the "zorder" kwarg to make the image overlay
# the plot, rather than hide behind it... (e.g. zorder=10)
fig.figimage(im, fig.bbox.xmax - width, fig.bbox.ymax - height, zorder=0)

# (Saving with the same dpi as the screen default to
#  avoid displacing the logo image)
fig.savefig('temp.png', dpi=80)

plt.show()

产生以下结果(图像被裁剪以节省空间)。

更改 zorder=1 会将图像放在顶部。

其他有用的引用资料:

• How to change background color for scatter plot in matplotlib
• How do you change the size of figures drawn with matplotlib?
• Python/Matplotlib - Change the relative size of a subplot
• In Matplotlib, what does the argument mean in fig.add_subplot(111)?
• Customizing Location of Subplot Using GridSpec