使用 ax.text、matplotlib 相对于轴定位字体

Position font relative to axis using ax.text, matplotlib

我不确定如何使用 matplotlib 相对于轴对象正确定位字体。

示例:

fig, axes = plt.subplots(nrows=1, ncols=3, figsize=(10, 4), dpi=100)
x = [1, 2]
y = [3, 4]

y_loc = 4.1
x_loc = 0.95
fs = 12
ax = axes[0]
ax.plot(x, y)
_ = ax.text(x=x_loc, y=y_loc, s="Plot 1", fontsize=fs)

ax = axes[1]
ax.plot(x, y)
_ = ax.text(x=x_loc, y=y_loc, s="Plot 2", fontsize=fs)

ax = axes[2]
_ = ax.plot(x, y)
_ = ax.text(x=x_loc, y=y_loc, s="Plot 3", fontsize=fs)

给出:

使用值:

y_loc = 4.1
x_loc = 0.95

让我觉得应该有更好的方法来解决这个问题。

注意 - 我想在这里使用 ax.text,而不是 title,问题主要是关于如何最好地定位文本相对于子图中特定轴的位置。理想情况下,如果它只是相对于特定轴,它也会扩展到网格图。

默认,ax.text uses "data coordinates", i.e. with x and y as shown on the ticks of the axes. To plot relative to the rectangle defined by the axes, use transform=ax.transAxes. Here 0,0 will be the point at the bottom left and 1,1 the point at the top right. (This kind of coordinates is also very useful when positioning a legend。)

from matplotlib import pyplot as plt
import numpy as np

fig, axes = plt.subplots(nrows=1, ncols=3, figsize=(10, 4), dpi=100)

for ind, ax in enumerate(axes):
    ax.plot(np.random.randint(0, 10, 2), np.random.randint(0, 10, 2))
    ax.text(x=0, y=1.05, s=f"Plot {ind+1}", fontsize=12, transform=ax.transAxes)
plt.show()