# polygon plot does not scale well Hi,

I'm trying to plot several polygons in one plot (with plot1+plot2+...). Strangly, for very different side length, the plot becomes more of a line instead of a rectangle. I tried the following code on SMC and locally:

hp=0.019
qscale=hp
polygon2d([[0.5-0.5,hp/2-qscale*0.05],[0.5+0.5,hp/2-qscale*0.05],[0.5+0.5,hp/2+qscale*0.05],[0.5-0.5,hp/2+qscale*0.05]], fill=False, thickness=1, color='blue',ticks=[None,0.0001])


I'd like to upload a picture but you need 60 karma points for that and since my old account belonging to google identity is lost I hope you can recreate the problem. Thanks in advance.

Update:

I wrote a minimal example which shows that the problem appears when the side length are not of the same order of magnitude

for i in [0.1,1,10,100]:
show(polygon2d([[0,0],[0,i],[1,i],[1,0]], fill=false))

edit retag close merge delete

Sort by » oldest newest most voted

To specify the ratio between the axes, you can use the aspect_ratio option.

sage: polygon2d([[0.5-0.5,hp/2-qscale*0.05],[0.5+0.5,hp/2-qscale*0.05],[0.5+0.5,hp/2+qscale*0.05],[0.5-0.5,hp/2+qscale*0.05]], fill=False, thickness=1, color='blue',ticks=[None,0.0001], aspect_ratio=500)


sage: for i in [0.1,1,10,100]:
....:     show(polygon2d([[0,0],[0,i],[1,i],[1,0]], fill=false), aspect_ratio=1/i)

more