将图像应用于pyplot python条形图


问题内容

因此,下面是我的代码片段,一切正常。可以仅将图像显示在条形图上,例如将其标记为国家标志等,而不是用特定的颜色显示条形图(请忽略我不一致的参数传递顺序)

谢谢

l_images=["australia.png","turkey.png"] # this is desired
l_colors=["pink","blue"]

if (l_bar_dir=="vertical"):                             
 plt.bar(xs2,ys,tick_label=xs,color=l_colors,bottom=bottoms,width=bar_width,align='center') # set plot to be a bar graph
else:                           
 plt.barh(bottom=xs2,width=ys,tick_label=xs,align='center',color=l_colors) # set plot to be a bar graph

问题答案:

尽管matplotlib确实允许条形图中的阴影线,但AFAIK没有内置的方法来执行此操作。参见例如hatch_demo

但是plt.imshow,以条形图的形式组合多个调用并不困难。这是一个相当粗糙的函数,可以使用图像的标志思想将图像用作基本的条形图。

import numpy as np
import matplotlib.pyplot as plt
from scipy.misc import imread

def image_plot(heights, images, spacing=0):
    # Iterate through images and data, autoscaling the width to
    # the aspect ratio of the image
    for i, (height, img) in enumerate(zip(heights, images)):
        AR = img.shape[1] / img.shape[0]
        width = height * AR
        left = width*i + spacing*i
        right = left + width
        plt.imshow(img, extent=[left, right, 0, height])
    # Set x,y limits on plot window
    plt.xlim(0, right)
    plt.ylim(0, max(heights)*1.1)

# Read in flag images
usa_flag = imread('american_flag.png')
aussie_flag = imread('australian_flag.png').swapaxes(0, 1)
turkish_flag = imread('turkish_flag.png').swapaxes(0, 1)

# Make up some data about each country
usa_data = 33
aussie_data = 36
turkish_data = 27

data = [usa_data, aussie_data, turkish_data]
flags = [usa_flag, aussie_flag, turkish_flag]

image_plot(data, flags, spacing=2)

在不对xy轴进行任何操作的情况下,返回此图。

在此处输入图片说明