如何通过将 pcolor 与颜色填充一起映射来用影线填充 pcolor

Question

嗨，我想继续我已经在这里问过的问题

问题是如何在我的 pcolor 上制作多个影线，这是图片

我想用 'x' 图案制作白色 pcolor，用 '+' 制作红色 pcolor。

有什么办法吗？提前谢谢你

lithcode = {'ABT': 1, 'AT': 2, 'GD': 3, 'BAT': 4, 'BTT': 5, 'TT': 6, 'NC': 7, 'MV':8, 'MS':9, 'GW':10}
colors = ['darkred', 'crimson', 'red', 'peru', 'lightsalmon', 'lightpink', 'white', 'oldlace', 
          'thistle', 'lightgray']
hatch=['','+','','','','','x','','','']
cmap = ListedColormap(colors)


Zb=litho['litho'].map(lithcode).to_numpy().reshape(1, -1)
nonan=np.count_nonzero(Zb[np.logical_not(np.isnan(Zb))])
Za=litho['litho'][:nonan].map(lithcode).to_numpy().reshape(1, -1)
X=litho['elev litho'][:nonan]
cl.pcolor(X, [0, 1], Za, cmap=cmap, vmin=1, vmax=len(colors))

# ax.set_yticks(data['md litho']) optionally set the y-ticks to indicate the row borders
hands = [Patch(color=col, label=k) for k, col in zip(lithcode.keys(), colors)]
cl.legend(handles=hands, loc=(1.01, 0), ncol=2, fontsize=8)

Answer 1

基于链接的示例数据，以及 How to hatch PolyCollection instance? 孵化由 pcolor 创建的 PolyCollection 的方法：

import matplotlib.pyplot as plt
from matplotlib.colors import ListedColormap
from matplotlib.patches import Patch, PathPatch
import pandas as pd

df = pd.DataFrame({'md litho': [0, 31, 49, 67, 406, 427, 442],
                   'litho': ['NC', 'AT', 'BTT', 'NC', 'ABT', 'BAT', 'NC']})
lithcode = {'ABT': 1, 'AT': 2, 'GD': 3, 'BAT': 4, 'BTT': 5, 'TT': 6, 'NC': 7, 'MV': 8, 'MS': 9, 'GW': 10}
colors = ['darkred', 'crimson', 'red', 'peru', 'lightsalmon', 'lightpink', 'white', 'oldlace', 'thistle', 'lightgray']
cmap = ListedColormap(colors)
hatches = ['', '++', '', '', '', '', 'xx', '', '', '']

fig, ax = plt.subplots(figsize=(12, 1.4))
lithcode_values = df['litho'][:-1].map(lithcode).to_numpy()
polycollection = ax.pcolor(df['md litho'], [0, 1], lithcode_values.reshape(1, -1), cmap=cmap, vmin=1, vmax=len(colors))
ax.set_xticks(df['md litho'])  # optionally set the x-ticks to indicate the column borders
ax.set_yticks([])  # hide ticks on the y-axis

for path, d2_val in zip(polycollection.get_paths(), lithcode_values):
    hatch = hatches[d2_val - 1]
    if hatch != '':
        ax.add_patch(PathPatch(path, hatch=hatch, facecolor='none', edgecolor='black'))

hands = [Patch(facecolor=col, label=k, edgecolor='black', hatch=hatch) for k, col, hatch in
         zip(lithcode.keys(), colors, hatches)]
ax.legend(handles=hands, bbox_to_anchor=(1.03, 1.02), loc='upper left', ncol=2, fontsize=8, facecolor='PaleTurquoise')
plt.tight_layout()  # this fits the legend and the labels nicely into the figure
plt.show()

PS：将 matplotlib.pyplot 导入为 cl 非常令人困惑。

如何通过将 pcolor 与颜色填充一起映射来用影线填充 pcolor

how to fill pcolor with hatches by mapping it alongwith color fill

python

numpy

matplotlib

plot

colormap