英文:
Matplotlib's stackplot change colors for overlapping regions
问题
使用Matplotlib的stackplot绘制堆叠面积图时，如果一组y值中有负数，那么该区域会与下面的区域重叠。例如：
import matplotlib.pyplot as plt
plt.stackplot([1,2,3], [1,2,3], [1,0,-1])
plt.show()
您可以看到顶部的y值为橙色。由于最右边的y值为-1，它与蓝色区域重叠。对于我的需求来说这是可以的。但是，我需要使这种重叠明显，以便区分它与蓝色区域仅仅保持在x=2.0到x=3.0之间的y=2.0不同，而橙色区域为正数。是否可以将这种重叠设置为不同的颜色？
英文:
When I draw a stacked area plot using Matplotlib's stackplot, if a set of y values has a negative number in it, then that area will overlap with the area underneath. For example:
import matplotlib.pyplot as plt
plt.stackplot([1,2,3], [1,2,3], [1,0,-1])
plt.show()
You can see the top set of y values are in orange. Since the right most y value is -1, it overlaps with the blue region. This is fine for my purposes. Except, I need that to be clear it's an overlap as opposed to the blue region just stayed at y=2.0 from x=2.0 to x=3.0 and the orange area is positive. Can overlaps like this be set to a different color?
答案1
得分: 0
可以将重叠的部分设置成不同的颜色吗？
是的，您可以将第二个 y 数据分成两次绘制：
import matplotlib.pyplot as plt
import numpy as np
y1 = [1,2,3]
y2 = [1,0,-1]
polys = plt.stackplot([1,2,3], y1, np.maximum(y2, 0), np.minimum(y2, 0))
我认为更好的解决方案是将颜色设置为半透明，也可以添加阴影效果：
polys = plt.stackplot([1,2,3], [1,2,3], [1,0,-1], alpha=0.3)
for poly, hatch in zip(polys, ['|', '-']):
poly.set_hatch(hatch)
poly.set_edgecolor(poly.get_facecolor())
英文:
> Can overlaps like this be set to a different color?
Yes, you could draw the second y data in two runs:
import matplotlib.pyplot as plt
import numpy as np
y1 = [1,2,3]
y2 = [1,0,-1]
polys = plt.stackplot([1,2,3], y1, np.maximum(y2, 0), np.minimum(y2, 0))
I think, however, a better solution would be to make the colors semi-transpartent, maybe with additional hatching:
polys = plt.stackplot([1,2,3], [1,2,3], [1,0,-1], alpha=0.3)
for poly, hatch in zip(polys, ['|', '-']):
poly.set_hatch(hatch)
poly.set_edgecolor(poly.get_facecolor())
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