poly numeric array variable
poly {x1, y1, x2, y2, x3, y3 …}
Draws a polygon. The sides of the polygon are defined by the values stored in the array, which should be stored as x,y pairs, sequentially. The length of the array/2 will define the number of points. A polygon may also be specified using a list of x,y pairs enclosed in curly braces {}.
The number of points in the array argument was removed from the poly statement in version 0.9.4.