The 'POLYGON' mnemonic draws a closed object bounded by lines between
the specified coordinate points. The polygon is filled using the current
brush settings. In the second form, numbers should have the appropriate
number of coordinate pairs in it. All points must be integers (no floating
point) in base 10, represented as groups of digits separated and terminated
The following examples produce identical results:
PRINT 'POLYGON'(3), "0 0 0 10 10 0 "
PRINT 'POLYGON'(3), "0,0 0,10 10a0 "