492
CHAPTER 6 Rendering
NAME APPEARANCE DEFINITION
EllipseA 1 − (x 2 + 0.9 × y 2 )
{ dup mul 0.9 mul exch dup mul add 1 exch sub }
InvertedEllipseA x 2 + 0.9 × y 2 − 1
{ dup mul 0.9 mul exch dup mul add 1 sub }
EllipseB
2 5 2
1– x + -- × y
8
{ dup 5 mul 8 div mul exch dup mul exch add sqrt
1 exch sub }
EllipseC 1 − (0.9 × x2 + y2 )
{ dup mul exch dup mul 0.9 mul add 1 exch sub }
InvertedEllipseC 0.9 × x 2 + y 2 − 1
{ dup mul exch dup mul 0.9 mul add 1 sub }