如何保持在前面較小值的3D條形圖

Question

在這個問題被質疑How do I keep the smaller value in a bar chart in front (when I cannot place the bars side by side)?

我想要做這樣的事情在3D繪圖相關。儘管掩碼看起來不錯，但情節只顯示更高的值。我無法理解爲什麼這段代碼不會繪製不會覆蓋對方的酒吧。每個步驟（ax.bar）看起來都不錯，但是結合在一起只顯示更高的值。我究竟做錯了什麼？

from mpl_toolkits.mplot3d import Axes3D 
import matplotlib.pyplot as plt 
import numpy as np 
import numpy.ma as ma 

dim1 = np.array([0, 1, 0, 1]) 
dim2 = np.array([0, 0, 1, 1]) 
var1 = np.array([1, 2, 1.5, 1.25]) 
var2 = np.array([0.5, 2.2, 1.15, 1.75]) 

fig = plt.figure() 
ax = fig.add_subplot(111, projection='3d') 

mask_var1 = ma.where(var1>=var2) 
mask_var2 = ma.where(var2>=var1) 

print mask_var1 
print mask_var2 

# Draw var1 bar where var1 >= var2 
ax.bar(dim1[mask_var1], var1[mask_var1], dim2[mask_var1], zdir='y', width=0.1, color='red') 
# Draw var2 
ax.bar(dim1, var2, dim2, zdir='y', width=0.1, color='blue') 
# Draw var1 bar where var2 >= var1 
ax.bar(dim1[mask_var2], var1[mask_var2], dim2[mask_var2], zdir='y', width=0.1, color='red') 

plt.show() 

Answer 1

看起來Axes3D有這樣problems分層補丁。您可能只計算和繪製每個補丁的可見部分。

# Draw var1 bar where var1 >= var2 
ax.bar(dim1[mask_var1], (var1 - var2)[mask_var1], dim2[mask_var1], 
     bottom=var2[mask_var1], zdir='y', width=0.1, color='red') 

# Draw var2 bar where var2 >= var1 
ax.bar(dim1[mask_var2], (var2 - var1)[mask_var2], dim2[mask_var2], 
     bottom=var1[mask_var2], zdir='y', width=0.1, color='blue') 

# Draw var1 bar where var2 >= var1 
ax.bar(dim1[mask_var2], var1[mask_var2], dim2[mask_var2], zdir='y', 
     width=0.1, color='red') 

# Draw var2 bar where var1 >= var2 
ax.bar(dim1[mask_var1], var2[mask_var1], dim2[mask_var1], zdir='y', 
     width=0.1, color='blue')