[英]How to rotate fancy arrow in Matplotlib
我該如何旋轉Matplotlib中的花式箭頭(我不想設置動畫),我嘗試了rotation和transform ,但它們都不對我有用,我認為我在做一些錯誤,請提供任何幫助或替代方法解決方案表示贊賞,我已經在下面粘貼了我的代碼。
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
#Arrow in degree
#Arrow represent the wind direction
degree= 45 #Arrow should rotate as per the specified degree, (0 degree is North)
#Draw Circle
#CENTER POINT
Circle1 = plt.Circle((5, 5), 0.1, color='blue', fill=True)
ax.add_artist(Circle1)
#CIRCLE
Circle2 = plt.Circle((5, 5), 6, color='blue', fill=False)
ax.add_artist(Circle2)
x3=5.0
y3=6.8
x4=5.0
y4=9.0
#Wind Direction Arrow
#LEFT ARROW
ax.annotate('',
xy=(x3-0.5, y3), xycoords='data',
xytext=(-20, 50), textcoords='offset points', rotation=degree,
size=20,
# bbox=dict(boxstyle="round", fc="0.8"),
arrowprops=dict(arrowstyle="fancy",
fc="0.6", ec="none",
connectionstyle="angle3,angleA=0,angleB=-90"))
#CENTER ARROW
ax.annotate('',
xy=(x3, y3), xycoords='data',
xytext=(0, 50), textcoords='offset points', rotation=degree,
size=20,
# bbox=dict(boxstyle="round", fc="0.8"),
arrowprops=dict(arrowstyle="fancy",
fc="0.6", ec="none",
connectionstyle="angle3,angleA=0,angleB=-90"))
#RIGHT ARROW
ax.annotate('',
xy=(x3+0.5, y3), xycoords='data',
xytext=(20, 50), textcoords='offset points', rotation=degree,
size=20,
# bbox=dict(boxstyle="round", fc="0.8"),
arrowprops=dict(arrowstyle="fancy",
fc="0.6", ec="none",
connectionstyle="angle3,angleA=0,angleB=-90"))
ax.set_aspect('equal')
ax.set_xlim([-2.5,12.5])
ax.set_ylim([-3,15])
plt.show()
我的要求:
所有3個箭頭(箭頭代表風向)都應旋轉至指定的角度,並保持中心點為錨點。
由於箭頭的頭和尾是在不同的坐標系中指定的,所以我似乎唯一的選擇是圍繞圓心分別旋轉坐標。
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.transforms as mtrans
fig, ax = plt.subplots()
#Arrow represent the wind direction
#Arrow should rotate as per the specified degree, (0 degree is North)
x3=5.0
y3=5.0
#Draw Circle
#CENTER POINT
Circle1 = plt.Circle((x3, y3), 0.1, color='blue', fill=True)
ax.add_artist(Circle1)
#CIRCLE
Circle2 = plt.Circle((x3, y3), 6, color='blue', fill=False)
ax.add_artist(Circle2)
def winddirectionarrow(ax, xy, deg):
m1 = np.array( (-1, 1) )
m2 = np.array( (0, 1) )
s1 = np.array( (0.5, 1.8) )
s2 = np.array( (20, 50) )
xy = np.array(xy)
rot = mtrans.Affine2D().rotate_deg(deg)
#Wind Direction Arrow
cncs = "angle3,angleA={},angleB={}".format(deg,deg-90)
kw = dict(xycoords='data',textcoords='offset points',size=20,
arrowprops=dict(arrowstyle="fancy", fc="0.6", ec="none",
connectionstyle=cncs))
#LEFT ARROW
ax.annotate('', xy=xy + rot.transform_point(m1*s1),
xytext=rot.transform_point(m1*s2), **kw)
#CENTER ARROW
ax.annotate('', xy=xy + rot.transform_point(m2*s1),
xytext=rot.transform_point(m2*s2), **kw)
#RIGHT ARROW
ax.annotate('', xy=xy + rot.transform_point(s1),
xytext=rot.transform_point(s2), **kw)
winddirectionarrow(ax, (x3,y3), 45)
winddirectionarrow(ax, (x3,y3), -60)
winddirectionarrow(ax, (x3,y3), 170)
ax.set_aspect('equal')
ax.set_xlim([-2.5,12.5])
ax.set_ylim([-3,15])
plt.show()
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