I would like to have a green polygon with black border. I can achieve this by superposing two polygons:
sage: polygon([[0,0],[0,1],[2,1],[1,0]],color='limegreen',fill=True)+polygon([[0,0],[0,1],[2,1],[1,0]],color='black',fill=False)
Is it possible to do that with one polygon ?
Matplotlib polygons do have edgecolor as a keyword. Currently the way Sage wraps these you might have to do a little work to get that to work out right. In principle the following should work, but it doesn't seem to:
sage: P = polygon([[0,0],[0,1],[2,1],[1,0]],color='limegreen', thickness=2)
sage: p = P.matplotlib()
sage: p.set_edgecolor('black')
sage: from matplotlib.backends.backend_agg import FigureCanvasAgg
sage: p.set_canvas(FigureCanvasAgg(p))
sage: p.savefig('test.png')
as can be seen by trying
sage: !open test.png
Matplotlib has added a lot of functionality we haven't wrapped properly yet.
You can use your own python function:
def rim_polygon(V,border_color='black',**kwargs):
G = polygon(V,**kwargs)
d = kwargs.get('thickness',1)
G += polygon(V,color=border_color,fill=False,thickness=d)
return G
L = [(0,0),(0,1),(2,1),(1,0)]
rim_polygon(L,color='red',alpha=0.5,thickness=4,axes=False)
Asked: 2014-10-23 17:37:12 +0100
Seen: 3,889 times
Last updated: Oct 23 '14
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This is now http://trac.sagemath.org/ticket/17209. Needs review.