MetaFun - Pragma ADE

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The dir command returns an unit vector, which is why the first two shapes look different and are
smaller than the third one. We can compensate for that by an additional scaling:
pickup pencircle scaled 2mm ;
draw (origin -- dir(45) -- dir(0) -- cycle)
scaled sqrt(2) scaled 3cm withcolor .625red ;
draw (origin -- dir(angle(1,1)) -- dir(angle(1,0)) -- cycle)
scaled sqrt(2) scaled 3cm shifted (4.5cm,0) withcolor .625yellow ;
draw (origin -- (1,1) -- (1,0) -- cycle)
scaled 3cm shifted (9cm,0) withcolor .625white ;
1.5 Drawing pictures
Once a path is defined, either directly or as a variable, you can turn it into a picture. You can draw
a path, like we did in the previous examples, or you can fill it, but only if it is closed.
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Drawing is done by applying the draw command to a path, as in:
draw (0cm,1cm)..(2cm,2cm)..(4cm,0cm)..cycle ;
The rightmost graphic was made with fill:
fill (0cm,1cm)..(2cm,2cm)..(4cm,0cm)..cycle ;
If you try to duplicate this drawing, you will notice that you will get black lines instead of red and
a black fill instead of a gray one. When drawing or filling a path, you can give it a color, use all
kinds of pens, and achieve special effects like dashes or arrows.
Welcome to MetaPost Drawing pictures
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