MetaFun - Pragma ADE

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Of course it would be best to define the euro as one shape, but we won't go though that process
right now. By packaging the combined paths in an image, we can conveniently color the euro
symbol:
draw euro_symbol withcolor .625red ;
You may wonder why we both draw and fill the euro, using a pen with zero width. We've done
this in order to demonstrate the redraw and refill macros.
redraw currentpicture withpen pencircle scaled 4pt withcolor .625yellow ;
refill currentpicture withcolor .625white ;
setbounds currentpicture to boundingbox currentpicture enlarged 2pt ;
13.10 Killing time
Not seldom TEX users want to use this program and its meta--relatives as general purpose tools,
even at the cost of quite some effort or suboptimal results. Imagine that you are under way from
our planet to Mars. After a long period of sleep you wake up and start wondering on what track
you are. You even start questioning the experts that send you on your way, so you pop open your
laptop, launch your editor and start metaposting.
First you need to determine the begin and end points of your journey. For this it is enough to know
the relative angle of the paths that both planets follow as well as the path themselves. We assume
circular paths.
path a ; a := fullcircle scaled 3cm ;
path b ; b := fullcircle scaled 2cm rotated 120 ;
draw a withpen pencircle scaled 1mm withcolor .625red ;
A few applications Killing time