CHAPTER 6
492
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
1
–
2
5
2
x
+ --
×
y
8
{ dup 5 mul 8 div mul exch dup mul exch add sqrt
1 exch sub }
EllipseC
1
−
(0.9
×
x
2
+
y
2
)
{ 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 }