arrow函数
matplotlib.pyplot.arrow(
x, y, dx, dy,
hold=None, **kwargs)
参数
x, y : 箭头起点坐标
dx, dy : 箭头x上的长度和y轴上的长度
width: 箭头宽度，默认0.001
length_includes_head: bool，箭"头"是否包含在长度之中 默认False
head_width: float,箭"头"的宽度，默认: 3*width
head_length: float 箭"头"的长度，默认1.5 * head_width
shape: [‘full’, ‘left’, ‘right’]，箭头形状， 默认 ‘full’
overhang: float (default: 0)
head_starts_at_zero: bool (default: False)开始坐标是否是0
返回值
参数对比实例
# -*- coding:utf-8 -*-
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
ax = plt.subplot(331)
ax.arrow(0, 0, 0.5, 0.5, width=0.05)
ax.set_title("0, 0, 0.5, 0.5, width=0.05")
ax = plt.subplot(332)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,length_includes_head=True)
ax.set_title("0, 0, 0.5, 0.5, width=0.05,length_includes_head=True")
ax = plt.subplot(333)
ax.arrow(0, 0, 0.5, 0.5, width=0.1)
ax.set_title("0, 0, 0.5, 0.5, width=0.1")
ax = plt.subplot(334)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,shape="left")
ax.set_title("0, 0, 0.5, 0.5, width=0.05,shape=left")
ax = plt.subplot(335)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,shape="right")
ax.set_title("0, 0, 0.5, 0.5, width=0.05,shape=right")
ax = plt.subplot(336)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,overhang=0.5)
ax.set_title("0, 0, 0.5, 0.5, width=0.05,overhang=0.5")
ax = plt.subplot(337)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,head_starts_at_zero=True)
ax.set_title("0, 0, 0.5, 0.5, width=0.05,head_starts_at_zero=True")
ax = plt.subplot(338)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,fill=False,ec='red')
ax.set_title("0, 0, 0.5, 0.5, width=0.05,fill=False,ec='red'")
ax = plt.subplot(339)
ax.arrow(0, 0, 0.5, 0.5, width=0.05,fc='red',ec='blue',alpha=0.3)
ax.set_title("0, 0, 0.5, 0.5, width=0.05,fc='red',ec='blue',alpha=0.3")
plt.gcf().set_size_inches(14,12)
plt.savefig('arrow.png')
plt.show()
大概的画风就像是下面这样子的：
