插入定位器演示2
本演示展示了如何通过 zoomed_inset_axes 创建缩放插图。 在第一个子图中，AnchoredSizeBar 显示缩放效果。 在第二个子图中，通过mark_inset 创建与感兴趣区域的连接。
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1.inset_locator import zoomed_inset_axes, mark_inset
from mpl_toolkits.axes_grid1.anchored_artists import AnchoredSizeBar
import numpy as np
def get_demo_image():
from matplotlib.cbook import get_sample_data
import numpy as np
f = get_sample_data("axes_grid/bivariate_normal.npy", asfileobj=False)
z = np.load(f)
# z is a numpy array of 15x15
return z, (-3, 4, -4, 3)
fig, (ax, ax2) = plt.subplots(ncols=2, figsize=[6, 3])
# First subplot, showing an inset with a size bar.
ax.set_aspect(1)
axins = zoomed_inset_axes(ax, zoom=0.5, loc='upper right')
# fix the number of ticks on the inset axes
axins.yaxis.get_major_locator().set_params(nbins=7)
axins.xaxis.get_major_locator().set_params(nbins=7)
plt.setp(axins.get_xticklabels(), visible=False)
plt.setp(axins.get_yticklabels(), visible=False)
def add_sizebar(ax, size):
asb = AnchoredSizeBar(ax.transData,
size,
str(size),
loc=8,
pad=0.1, borderpad=0.5, sep=5,
frameon=False)
ax.add_artist(asb)
add_sizebar(ax, 0.5)
add_sizebar(axins, 0.5)
# Second subplot, showing an image with an inset zoom
# and a marked inset
Z, extent = get_demo_image()
Z2 = np.zeros([150, 150], dtype="d")
ny, nx = Z.shape
Z2[30:30 + ny, 30:30 + nx] = Z
# extent = [-3, 4, -4, 3]
ax2.imshow(Z2, extent=extent, interpolation="nearest",
origin="lower")
axins2 = zoomed_inset_axes(ax2, 6, loc=1) # zoom = 6
axins2.imshow(Z2, extent=extent, interpolation="nearest",
origin="lower")
# sub region of the original image
x1, x2, y1, y2 = -1.5, -0.9, -2.5, -1.9
axins2.set_xlim(x1, x2)
axins2.set_ylim(y1, y2)
# fix the number of ticks on the inset axes
axins2.yaxis.get_major_locator().set_params(nbins=7)
axins2.xaxis.get_major_locator().set_params(nbins=7)
plt.setp(axins2.get_xticklabels(), visible=False)
plt.setp(axins2.get_yticklabels(), visible=False)
# draw a bbox of the region of the inset axes in the parent axes and
# connecting lines between the bbox and the inset axes area
mark_inset(ax2, axins2, loc1=2, loc2=4, fc="none", ec="0.5")
plt.show()