MetaFun - Pragma ADE

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If we combine these two segments, we get:
0 1
3
20 31
2
However, when we draw them using the right linewidth and color, you will notice that we're not
yet done:
The second curve is similar to the first one, but rotated over 180 degrees.
addto currentpicture also currentpicture
rotatedaround (.5[z2,z3],180) shifted (height/4,height/2) ;
In order to get the sharp edges, we need to clip off part of the curves and at first sight, we may
consider using a scaled bounding box. However, when we show the natural bounding box, you
will notice that a more complicated bit of calculations is needed.
The right clip path is calculated using the following expressions. Watch how we use rt and top
to correct for the linewidth.
numeric d, lx, ly, ux, uy ; d = line/2 ;
lx = -3d - d/3 ; ly = -d ; ux = rt x5 + d/3 ; uy = top y6 ;
path r ; r := (lx,ly)--(ux,ly)--(ux,uy)--(lx,uy)--cycle;
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