Matplotlib绘图基础之文本标注详解

import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(0, 10, 100)
y = x*x 
fig = plt.figure()
ax = fig.add_axes([0.1, 0.1, 0.8, 0.8])
#设置 标题 的字体和颜色
ax.set_title("标题", fontdict={"fontsize": 25, "color": "r"})
#设置 X轴和Y轴 标签的字体和颜色
ax.set_xlabel("x轴", fontdict={"fontsize": 20,"color": "g"})
ax.set_ylabel("y轴", fontdict={"fontsize": 20,"color": "b"})
#按照坐标位置(2, 60)添加一段文本
ax.text(2, 60, "f(x) = x*x", fontdict={"fontsize": 15,"color": "k"})
ax.plot(x, y, label="sin")
ax.legend()

x = np.linspace(0, 10, 100)
y = x*x 
fig = plt.figure()
ax = fig.add_axes([0.1, 0.1, 0.8, 0.8])
#设置 标题 的字体和颜色
ax.set_title("标题", fontdict={"fontsize": 25, "color": "r"})
#设置 X轴和Y轴 标签的字体和颜色
ax.set_xlabel("x", fontdict={"fontsize": 20,"color": "g"})
ax.set_ylabel("$x^2$", fontdict={"fontsize": 20,"color": "b"})
#按照坐标位置(2, 60)添加一段文本
ax.text(2, 60, "$f(x) = x^2$", fontdict={"fontsize": 15,"color": "k"})
ax.plot(x, y, label="sin")
ax.legend()

x = np.array(range(10))
y = np.array([89, 84, 30, 67, 41, 71, 62, 20, 89, 3])
fig = plt.figure()
ax = fig.add_axes([0.1, 0.1, 0.8, 0.8])
ax.plot(x, y)
ax.annotate(
    "第一个值",
    xy=(0, 89),
    xytext=(-0.3, 70),
    arrowprops={"arrowstyle": "->", "connectionstyle": "arc3,rad=-0.5"},
)
ax.annotate(
    "转折点一",
    xy=(2, 30),
    xytext=(1.8, 10),
    bbox={"boxstyle": "round", "fc": "none", "ec": "g"},
    arrowprops={"arrowstyle": "->"},
)
ax.annotate(
    "转折点二",
    xy=(3, 67),
    xytext=(3, 85),
    bbox={"boxstyle": "round", "fc": "lightblue", "ec": "r"},
    arrowprops={"arrowstyle": "fancy"},
)
ax.annotate(
    "最大值",
    xy=(8, 89),
    xytext=(6, 85),
    bbox={"boxstyle": "round", "alpha":0.1},
    arrowprops={"arrowstyle": "wedge,tail_width=0.8", "alpha":0.1},
)