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use the "zorder" keyword. higher zorder stay above lower values.

cheers
Francesco
Il giorno 24/ago/2013 11:27, "vwf" <vw...@vu...> ha scritto:

> Hello,
>
> In the attached example I would like to have the wedges under the
> arrows. Can someone tell me how do this? I tried to follow the tutorial
> from http://matplotlib.org/users/artists.html  but I didn't really get
> it all.
>
> Thank you
>
>
> from pylab import *
> from numpy import ma
> import math
> import matplotlib.pyplot as plt
> from matplotlib.patches import Wedge
>
> X,Y = meshgrid( arange(0,2*pi,1),arange(0,2*pi,1) )
> U = cos(X)
> V = sin(Y)
>
> def draw_w(x, y, p1, v, ax=None, **kwargs):
>     if ax is None:
>         ax = plt.gca()
>     p1*=180/math.pi
>     t1= (p1-v)
>     t2= (p1+v)
>     c=(x,y)
>     radius=0.5
>     w1 = Wedge(c, radius, t1, t2, fc='0.0', ec='None', alpha=1.0, **kwargs)
>     ax.add_artist(w1)
>
> fig, ax = plt.subplots()
> Q = plt.quiver( U, V, color='LightSalmon', edgecolors='LightSalmon')
> (a,b)=shape(X)
> for i in range(a):
>     for j in range(b):
>         draw_w(X[i,j],Y[i,j],X[i,j], 25, ax=ax)
> plt.show()
>
>
>
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Hello,

In the attached example I would like to have the wedges under the
arrows. Can someone tell me how do this? I tried to follow the tutorial
from http://matplotlib.org/users/artists.html  but I didn't really get
it all.

Thank you


from pylab import *
from numpy import ma
import math
import matplotlib.pyplot as plt
from matplotlib.patches import Wedge

X,Y = meshgrid( arange(0,2*pi,1),arange(0,2*pi,1) )
U = cos(X)
V = sin(Y)

def draw_w(x, y, p1, v, ax=None, **kwargs):
    if ax is None:
        ax = plt.gca()
    p1*=180/math.pi
    t1= (p1-v)
    t2= (p1+v)
    c=(x,y)
    radius=0.5
    w1 = Wedge(c, radius, t1, t2, fc='0.0', ec='None', alpha=1.0, **kwargs)
    ax.add_artist(w1)

fig, ax = plt.subplots()
Q = plt.quiver( U, V, color='LightSalmon', edgecolors='LightSalmon')
(a,b)=shape(X)
for i in range(a):
    for j in range(b):
        draw_w(X[i,j],Y[i,j],X[i,j], 25, ax=ax)
plt.show()