option可以是"first","last","both"或"none"。见graphics.py:
def setArrow(self, option):
if not option in ["first","last","both","none"]:
raise GraphicsError(BAD_OPTION)
self._reconfig("arrow", option)
细节要查Tk文档：
6.6. The canvas line object
In general, a line can consist of any number of segments connected end to end, and each segment can be straight or curved. To create a canvas line object on a canvas C, use:
id = C.create_line ( x0, y0, x1, y1, ..., xn, yn, option, ... )
The line goes through the series of points
(x0,
y0),
(x1,
y1),
…
(xn,
yn).
Options include:
arrow The default is for the line to have no arrowheads. Use
arrow=FIRST to get an arrowhead at the(x0,y0)end of the line. Use
arrow=LAST to get an arrowhead at the far end. Use
arrow=BOTH for arrowheads at both ends.
#绘制箭头例子
def arrow():
plt.rcParams['font.sans-serif'] = ['SimHei']
plt.style.use('seaborn-deep')
fig = plt.figure(figsize=(16, 9),dpi=75)
ax = fig.add_subplot(121)
x=np.array([1,2,3,4])
y=np.array([2,4,6,8])
ax.plot(x,y,color = 'b')
ax.annotate("",
xy=(4.5, 9),
xytext=(4, 8),
arrowprops=dict(arrowstyle="->", color="r"))
# 设置X轴、Y轴最大坐标
ax.set_xlim(0, 10)
ax.set_ylim(0, 10)
ax.grid()
ax.set_aspect('equal')
plt.title("趋势展示图")
plt.show()
arrow()
1、首先，我们打开我们的电脑，然后我们打开我们电脑上面的一个excel文档。
2、之后我们选中图示中的区域。
3、然后我们点击工具栏中的插入。
4、之后我们点击散点图下方的下拉箭头。
5、弹出的界面，我们点击带平滑线的散点图。
6、之后我们就会在文档中看到一个带平滑线的散点图了，我们点击空白处。
7、最终结果如图所示，这样我们就制作好一个带平滑线的散点图了。
