This fivecornered polygon makes a simple house shape:
1,0, 1,1, 1,1, 1,0,
0,1, END 

This is the same house shape, but with the top corner turned into a spline point:
1,0, 1,1,
1,1, 1,0, SPLINE,0,1, END 

Same house shape, but with the two roof’seve corners turned into spline points:
SPLINE,1,0,
1,1, 1,1, SPLINE,1,0, 0,1, END
Note that this case would not work
without the divisionbyzero protection, because the eve points are vertically at the midpoint between the top and
bottom of the house. 

Same house shape, with the two bottom corner points turned into spline points:
1,0,
SPLINE,1,1, SPLINE,1,1, 1,0, 0,1, END 

Same house shape, with all five corners turned into spline points:
SPLINE,1,0, SPLINE,1,1,
SPLINE,1,1, SPLINE,1,0, SPLINE,0,1, END 

Here’s an example of using the “NEW_LOOP” tag to put two polygons in one. In this case, the smaller
polygon is a hole in the larger one, since it is inside it:
SPLINE,1,1, SPLINE,1,1,
SPLINE,1,1, SPLINE,1,1, NEW_LOOP, SPLINE,.5,.5, SPLINE,.5,.5, SPLINE,.5,.5,
SPLINE,.5,.5, END 

This uses the “NEW_LOOP” tag to make two loops, but they don’t overlap each other:
.25,0,
.125,0, .125,.875, .25,.875, .25,1, .25,1, .25,.875, .125,.875,
.125,.125, .25,.125, NEW_LOOP, SPLINE,.125,.375, SPLINE,.125,.375,
SPLINE,.125,.25, SPLINE,.125,.25, END 

You can’t do a real circle with splines, but this eightpoint polygon makes a sweet
fake:
SPLINE,.4142,1, SPLINE,1,.4142, SPLINE,1,.4142, SPLINE,.4142,1,
SPLINE,.4142,1, SPLINE,1,.4142, SPLINE,1,.4142, SPLINE,.4142,1, END
FYI,
.4142 is sqrt(2)1. 
