#Loopy arrow Patch

L * np.cos((headangle + arrowheadopenangle) * np.pi / 180), Headangle = (direction + closingangle + (90 - headcorrectionangle) * Y = [yc + aspect * radius * np.sin((ang + 180 + direction) * np.pi / 180) X = Yc = y0 + aspect * radius * np.sin(direction * np.pi / 180) Xc = x0 + radius * np.cos(direction * np.pi / 180) aspect is important to make the aspect of the arrow

In degrees with positive being counterclockwise and negative beingĬlockwise. closingangle indicates how much of the circle is drawn x0 and y0 are the anchor points.ĭirection gives the angle of the circle center relative to the anchor My suggestion uses just the plot command import matplotlib.pyplot as pltĭef circarrowdraw(x0, y0, radius=1, aspect=1, direction=270, closingangle=-330,Īrrowheadrelativesize=0.3, arrowheadopenangle=30, *args):Ĭircular arrow drawing. ShrinkA=10, # creates a gap between the start point and end point of the arrowĬonnectionstyle='angle,angleB=-90,angleA=180,rad=10'))Īx.annotate('', (x_center, y_center - radius), (x_center + radius, y_center),Ĭonnectionstyle='angle,angleB=180,angleA=-90,rad=10'))Īx.annotate('', (x_center - radius, y_center), (x_center, y_center - radius),Īx.annotate('', (x_center, y_center + radius), (x_center - radius, y_center), I find no way to make a loop using plt.annotate only once, but using it four times works : import matplotlib.pyplot as pltĪx.annotate('', (x_center + radius, y_center), (x_center, y_center + radius), # Make sure you keep the axes scaled or else arrow will distort Theta1=0,theta2=theta2_,capstyle='round',linestyle='-',lw=10,color=color_)ĮndX=centX+(radius/2)*np.cos(rad(theta2_+angle_)) #Do trig to determine end positionĮndY=centY+(radius/2)*np.sin(rad(theta2_+angle_))Īx.add_patch( #Create triangle as arrow headĪx.set_xlim() and ax.set_ylim() # from _future_ import division #Uncomment for python2.7įrom matplotlib.patches import Arc, RegularPolygonĭef drawCirc(ax,radius,centX,centY,angle_,theta2_,color_='black'):Īrc = Arc(,radius,radius,angle=angle_,

#Loopy arrow Patch

You can play around with the patch that creates the arrow head to make a different shape though I suspect that this triangle will be the easiest one. Change the variables in the variables section and things should all rotate and scale together. It seems the easiest way to create an easily modifiable looping arrow is to use patches.