在matplotlib图形中插入png图像 [英] Insert a png image in a matplotlib figure

问题描述

我正在尝试在matplotlib图中插入png图像(

获得的输出:

我想知道如何调整为避免重叠而必须插入的图像的大小.

保存数字

  ax.figure.savefig("output.svg"，transparent = True，dpi = 600，bbox_inches ="tight") 

解决方案

您可以缩放图像，并将框对齐方式设置为右下角(0,1)，外加一些额外的边距:

  im = OffsetImage(arr_img，zoom = .45)ab = AnnotationBbox(im，(1，0)，xycoords ='轴分数'，box_alignment =(1.1，-0.1)) 

您可能还希望使用数据坐标(这是默认值)，并使用默认的box_alignment到中心，例如 ab = AnnotationBbox(im，(2.6，1.45)).有关各种坐标选项的更多信息，请参见 xycoords参数文档./p>

I'm trying to insert a png image in matplotlib figure (ref)

import matplotlib.pyplot as plt
import numpy as np

from matplotlib.figure import Figure
from matplotlib.offsetbox import OffsetImage, AnnotationBbox


ax = plt.subplot(111)
ax.plot(
    [1, 2, 3], [1, 2, 3],
    'go-',
    label='line 1',
    linewidth=2
 )
arr_img = plt.imread("stinkbug.png")
im = OffsetImage(arr_img)
ab = AnnotationBbox(im, (1, 0), xycoords='axes fraction')
ax.add_artist(ab)
plt.show()

Inset image:

Output obtained:

I'd like to know how to resize the image that has to be inserted to avoid overlaps.

EDIT: Saving the figure

ax.figure.savefig("output.svg", transparent=True, dpi=600, bbox_inches="tight")

解决方案

You can zoom the image and the set the box alignment to the lower right corner (0,1) plus some extra for the margins:

im = OffsetImage(arr_img, zoom=.45)
ab = AnnotationBbox(im, (1, 0), xycoords='axes fraction', box_alignment=(1.1,-0.1))

You may also want to use data coordinates, which is the default, and use the default box_alignment to the center, e.g. ab = AnnotationBbox(im, (2.6, 1.45)). See the xycoords parameter doc for more information about various coordinate options.

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