Einar M. Einarsson wrote:
> Hi all.
>
> is it not possible to extend plot outside of a plot area? To
> illustrate what I want
> to do take for example the wind barbs example from the matplotlib
> gallery.
> (see below)
>
> I only changed line 23 from ax.barbs(X, Y, U, V) to ax.barbs(X, Y, -
> U, -V)
>
> But now we don't see the tail of the barbs in the first subplot.
>
> So Is it possible to let matplotlib plot the tail, without extending
> the axes?
>
Einar: You can use the set_clip_box method of the barbs instance to
turn clipping off:
bb = ax.barbs(X, Y, -U, -V)
bb.set_clip_box(None)
-Jeff
> Best Regards
> Einar M. Einarsson
>
> '''
> Demonstration of wind barb plots
> '''
> import matplotlib.pyplot as plt
> import numpy as np
>
> x = np.linspace(-5, 5, 5)
> X,Y = np.meshgrid(x, x)
> U, V = 12*X, 12*Y
>
> data = [(-1.5, .5, -6, -6),
> (1, -1, -46, 46),
> (-3, -1, 11, -11),
> (1, 1.5, 80, 80),
> (0.5, 0.25, 25, 15),
> (-1.5, -0.5, -5, 40)]
>
> data = np.array(data, dtype=[('x', np.float32), ('y', np.float32),
> ('u', np.float32), ('v', np.float32)])
>
> #Default parameters, uniform grid
> ax = plt.subplot(2,2,1)
> ax.barbs(X, Y, -U, -V)
>
> #Arbitrary set of vectors, make them longer and change the pivot point
> #(point around which they're rotated) to be the middle
> ax = plt.subplot(2,2,2)
> ax.barbs(data['x'], data['y'], data['u'], data['v'], length=8,
> pivot='middle')
>
> #Showing colormapping with uniform grid. Fill the circle for an
> empty barb,
> #don't round the values, and change some of the size parameters
> ax = plt.subplot(2,2,3)
> ax.barbs(X, Y, U, V, np.sqrt(U*U + V*V), fill_empty=True,
> rounding=False,
> sizes=dict(emptybarb=0.25, spacing=0.2, height=0.3))
>
> #Change colors as well as the increments for parts of the barbs
> ax = plt.subplot(2,2,4)
> ax.barbs(data['x'], data['y'], data['u'], data['v'], flagcolor='r',
> barbcolor=['b','g'], barb_increments=dict(half=10, full=20,
> flag=100),
> flip_barb=True)
>
> plt.show()
>
>
>
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