Dashed edge of a polygon

asked 2021-04-26 17:57:09 +0100

Cyrille
1407 ●34 ●76 ●138

updated 2021-04-26 18:29:57 +0100

John Palmieri

8856 ●19 ●73 ●191 http://www.math.washin...

It seems that edges vould not be dashed

f = piecewise([((0, .4), 0), ([.4,1],1)] )
g = piecewise([((-0.001, 0), 1), ([0,0],.6), ((0,1),0.6), ([1,1],0)] )         
pl=polygon([(0,0), (0,1), (1,1),(1,0)],rgbcolor=(0.75, 0.85,0.85),edgecolor="black",linestyle="dashed") 
pl+=plot(f(x),(x,0,1), thickness=2,rgbcolor=(78.4, 3.1, 8.2)) 
pl+=plot(g(x),(x,-0.001,1), thickness=2, rgbcolor=(23,38.26,38.74),axes_labels=['$p$','$q$'], ticks=[[], []])    
pl+=circle((0.4,0.6), .02, fill=True, edgecolor=(0.96, 0.97,0.46), rgbcolor=(0.96, 0.97, 0.46)) 
show(pl)

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I had a problem in send ding the code. It's the reason of its bad formating

Cyrille ( 2021-04-26 17:58:41 +0100 )edit

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answered 2021-04-26 23:52:29 +0100

slelievre
17684 ●22 ●160 ●349 http://carva.org/samue...

updated 2021-05-04 10:08:43 +0100

This is not supported so far. This request is now tracked at:

Sage Trac ticket 31734: Add linestyle option to polygon2d

As a workaround, plot the polygon using thickness=0 and the outline separately using line2d.

sage: vertices = [(0, 1), (1, 1), (1, 0)]
sage: pl = polygon2d(vertices, color=(0.75, 0.85, 0.85), thickness=0)
sage: pl += line2d(vertices + [vertices[0]], color='black', linestyle='--')
sage: pl

Polygon with dashed edges

Edit. The ticket now has fix and positive review. Hopefully it will be part of some future Sage release.

If you installed Sage 9.2 or later from source or from binaries (rather than "via a package manager"), you can apply the fix to your current Sage installation by running the following commands in a terminal:

$ cd $(sage -c "print(SAGE_ROOT)")
$ git remote add trac git://trac.sagemath.org/sage.git -t develop
$ git checkout -b 31734
$ git pull trac u/chapoton/31734
$ ./sage -b

Next time you start Sage, it should have the fix.

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