【问题标题】:how to put text in matplotlib 3D bar graph at the top如何将文本放在顶部的matplotlib 3D条形图中
【发布时间】:2015-06-02 09:34:22
【问题描述】:

我需要为我的大学项目绘制一个 3D 条形图,条形图正在绘制,但我希望在每个条形图上显示文本,显示其 z 轴的值。

这是用于显示 2D 图形的代码 sn-p: source code link

#!/usr/bin/env python
# a bar plot with errorbars
import numpy as np
import matplotlib.pyplot as plt

N = 5
menMeans = (20, 35, 30, 35, 27)
menStd =   (2, 3, 4, 1, 2)

ind = np.arange(N)  # the x locations for the groups
width = 0.35       # the width of the bars

fig, ax = plt.subplots()
rects1 = ax.bar(ind, menMeans, width, color='r', yerr=menStd)

womenMeans = (25, 32, 34, 20, 25)
womenStd =   (3, 5, 2, 3, 3)
rects2 = ax.bar(ind+width, womenMeans, width, color='y', yerr=womenStd)

# add some text for labels, title and axes ticks
ax.set_ylabel('Scores')
ax.set_title('Scores by group and gender')
ax.set_xticks(ind+width)
ax.set_xticklabels( ('G1', 'G2', 'G3', 'G4', 'G5') )

ax.legend( (rects1[0], rects2[0]), ('Men', 'Women') )

def autolabel(rects):
    # attach some text labels
    for rect in rects:
        height = rect.get_height()
        ax.text(rect.get_x()+rect.get_width()/2., 1.05*height, '%d'%int(height),
                ha='center', va='bottom')

autolabel(rects1)
autolabel(rects2)

plt.show()

3D 条形图的代码是source code for 3d bar-graph

在 2D 版本中,自动标签函数使用 get_height()、get_x() 和 get_width() 来动态计算高度,这在 3D 版本中不支持:

  • 找不到函数的patch3d错误

是否有任何解决方法可以将文本显示为 2D 图形。

【问题讨论】:

标签: python graph matplotlib 3d


【解决方案1】:

您可以直接从数据中提取条形坐标并使用 matplotlib.pyplot.text,正如igavriil 所指出的那样。对于您提供的示例,如下所示:

# Note that z and y-axis are swapped in the plot.
for x,y in zip(xs,ys):
    ax.text(x,z,y,'%2.2f'%y, horizontalalignment='left', verticalalignment='bottom')

【讨论】:

    【解决方案2】:

    感谢igavriil该链接的帮助,也感谢hr tur tur

    我没有那个参数'%2.2f'%y 它是如何工作的,可能有更简洁的方法来绘制它,但我是这样绘制的:

        def autolabel():
        """ attach some text labels"""
        for i in range(0, n):
            ax.text(int(x[i])+1, y[i]-2, z[i]+0.05, str(y[i])[0:4],     color='#660066', backgroundcolor= '#c187e1', weight= 'bold', rotation='vertical', fontsize=10, horizontalalignment='left', verticalalignment='bottom')      
    

    链接:

    DropBox link

    【讨论】:

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