python添加绘图区并共享X轴

汪圣毅-安徽医科大学第一附属医院

转自CSDN的1篇文章

from matplotlib.backends.backend_agg import FigureCanvasAgg

from matplotlib.figure import Figure

from matplotlib.axes import Axes

import numpy as np

from numpy import math

figa =Figure(figsize=(9.6,4.8),

dpi=100,

facecolor=(239/256,239/256,239/256),

#facecolor=(0.18,0.31,0.31),

edgecolor=(82/256,101/256,155/256),

linewidth=10.0,

)

canvas = FigureCanvasAgg(figa)

# 供rect参数调用add_axes()方法

#创建的axes会自动绑定到figure上

rect = [0.125,0.125,0.6,0.6]

axa = figa.add_axes(rect,facecolor='C2')

#读取figa.axes属性列表

print(figa.axes)

x = np.arange(0, 2*math.pi, 0.001)

y = np.sin(x)

axa.plot(x, y, color='m')

axa.grid(b=True)

#从figa中删除axa

figa.delaxes(axa)

#再次读取figa的axes列表，应该为空

print(figa.axes)

#使用一个参数调用add_axes()方法

#将axa再次添加到figa中

#可注释下一行，生成的图形中已没有axes

figa.add_axes(axa)

s, (width, height) = canvas.print_to_buffer()

from PIL import Image #调用PIL

im = Image.frombytes("RGBA", (width, height), s)

im.show()

sharex, sharey

from matplotlib.backends.backend_agg import FigureCanvasAgg

from matplotlib.figure import Figure

from matplotlib.axes import Axes

import numpy as np

from numpy import math

fig =Figure(figsize=(9.6,4.8),

dpi=100,

facecolor=(239/256,239/256,239/256),

#facecolor=(0.18,0.31,0.31),

edgecolor=(82/256,101/256,155/256),

linewidth=10.0,

)

canvas = FigureCanvasAgg(fig)

recta = [0.08,0.08,0.42,0.42]

axesa = fig.add_axes(recta,facecolor='C2')

rectb = [0.5,0.5,0.43,0.43]

#请注意有无sharex=axesa，axesb的x轴刻度的差异

#axesb = fig.add_axes(rectb)

axesb = fig.add_axes(rectb,sharex=axesa) #axesb与axesa的刻度相同

x = np.arange(0, 2*math.pi, 0.001)

y = np.sin(x)

axesa.plot(x, y, color='m')

s, (width, height) = canvas.print_to_buffer()

from PIL import Image

im = Image.frombytes("RGBA", (width, height), s)

im.show()

添加axesb时，sharex = axesa