python - 如果 y 值更改，如何更改线条颜色

Question

我正在使用 pylab 绘制一些图表假设我想绘制这个:

x = [0,1,2,3,4,5,6,7,8,9,10]
y = [0,0,0,1,1,0,0,1,0,0,0]

plt.plot(x,y,'g')
plt.show()

但每次 [y = 1] 我都想将线条的颜色更改为红色。

这可能吗？

Answer 1

灵感来自 this answer :

from matplotlib import collections  as mc
from matplotlib import pyplot as plt

x = [0,1,2,3,4,5,6,7,8,9,10]
y = [0,0,0,1,1,0,0,1,0,0,0]

def getLines(points):
    lines = []
    lastX, lastY = points[0]
    for x,y in points[1:]:
        lines.append([(lastX,lastY), (lastX+1,lastY)])
        if y!=lastY:
            lines.append( [(x, lastY), (x,y)] ) 
        lastX, lastY = (x,y)
    return lines    

def getColor(point0, point1):
    x0,y0 = point0
    x1,y1 = point1
    return "r" if (y1==y0) and (y1==1) else "g"

points = [(i,j) for i,j in zip(x,y)]
lines = getLines(points)
colors = [getColor(*line) for line in lines]


lc = mc.LineCollection(lines, colors=colors, linewidths=2)
fig, ax = plt.subplots()
ax.add_collection(lc)
ax.autoscale()
ax.margins(0.1)

输出: