如何在绘图中使用自定义 png 图像标记? [英] How to use custom png image marker with plot?

问题描述

我想在散点图和折线图中使用客户标记.如何从 PNG 文件中制作自定义标记?

解决方案

我不相信 matplotlib 可以自定义这样的标记.请参阅

I would like to utilize customer markers in both scatter and line charts. How can I make custom marker out of a PNG file?

解决方案

I don't believe matplotlib can customize markers like that. See here for the level of customization, which falls way short of what you need.

As an alternative, I've coded up this kludge which uses matplotlib.image to place images at the line point locations.

import matplotlib.pyplot as plt
from matplotlib import image

# constant
dpi = 72
path = 'smile.png'
# read in our png file
im = image.imread(path)
image_size = im.shape[1], im.shape[0]

fig = plt.figure(dpi=dpi)
ax = fig.add_subplot(111)
# plot our line with transparent markers, and markersize the size of our image
line, = ax.plot((1,2,3,4),(1,2,3,4),"bo",mfc="None",mec="None",markersize=image_size[0] * (dpi/ 96))
# we need to make the frame transparent so the image can be seen
# only in trunk can you put the image on top of the plot, see this link:
# http://www.mail-archive.com/[e-mail]/msg14534.html
ax.patch.set_alpha(0)
ax.set_xlim((0,5))
ax.set_ylim((0,5))

# translate point positions to pixel positions
# figimage needs pixels not points
line._transform_path()
path, affine = line._transformed_path.get_transformed_points_and_affine()
path = affine.transform_path(path)
for pixelPoint in path.vertices:
    # place image at point, centering it
    fig.figimage(im,pixelPoint[0]-image_size[0]/2,pixelPoint[1]-image_size[1]/2,origin="upper")

plt.show()

Produces:

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