zorder' 在风玫瑰图中无法正常工作

Question

我给柱状图设置了一个比网格线更高的zorder值，但网格线还是在柱子上面可见。我也试过用 'ax.set_axisbelow(True)'，但没效果。有人能告诉我该怎么解决这个问题吗？

from windrose import WindroseAxes
import pandas as pd
import matplotlib.pyplot as plt

# Sample data
data = {
    'WD (Deg)': [45, 90, 135, 180, 225, 270, 315, 0, 45],
    'WS (m/s)': [2, 3, 4, 5, 6, 7, 8, 9, 10]}

# Create a DataFrame
df = pd.DataFrame(data)

# Create a WindroseAxes object
ax = WindroseAxes.from_ax()

# Customize the grid
ax.grid(True, linestyle='--', linewidth=2.0, alpha=0.5,
        color='grey', zorder = 0)

# Set the axis below the wind rose bars
ax.set_axisbelow(True) ## Not working 

# Plot the wind rose bars
ax.bar(df['WD (Deg)'], df['WS (m/s)'], normed=True, opening=0.5, edgecolor='black',
       cmap=plt.cm.jet, zorder = 3)

plt.show()

我不明白为什么会这样。我想把网格线画在柱状图下面。谢谢大家！

Answer 1

你可以手动设置图形中各个部分的层级顺序，比如：

from windrose import WindroseAxes
import pandas as pd
import matplotlib.pyplot as plt

# Sample data
data = {
    'WD (Deg)': [45, 90, 135, 180, 225, 270, 315, 0, 45],
    'WS (m/s)': [2, 3, 4, 5, 6, 7, 8, 9, 10]}

# Create a DataFrame
df = pd.DataFrame(data)

# Create a WindroseAxes object
ax = WindroseAxes.from_ax()

# Customize the grid
ax.grid(True, linestyle='--', linewidth=2.0, alpha=0.5,
        color='grey', zorder=0)

# Set the axis below the wind rose bars
ax.set_axisbelow(True) ## Not working 

# Plot the wind rose bars
ax.bar(df['WD (Deg)'], df['WS (m/s)'], normed=True, opening=0.5, edgecolor='black',
       cmap=plt.cm.jet)


from matplotlib.patches import Rectangle

# get the minimum zorder of the patches
minzorder = min(
    [
        c.get_zorder() for c in ax.get_children() if isinstance(c, Rectangle)
    ]
)

# loop through rectangle patches and set zorder manually
# (keeping relative order of each rectangle and adding 3)
for child in ax.get_children():
    if isinstance(child, Rectangle):
        zorder = child.get_zorder()
        child.set_zorder(3 + (zorder - minzorder))

        # or just subtract ZBASE, e.g.
        # from windrose.windrose import ZBASE
        # child.set_zorder(3 + (zorder - ZBASE))

plt.show()