490
CHAPTER 6 Rendering
NAME APPEARANCE DEFINITION
CosineDot cos ( 180 × x ) cos ( 180 × y )
- -
------------------------------ + ------------------------------
2 2
{ 180 mul cos exch 180 mul cos add 2 div }
Double
sin ⎛ 360 × --⎞
x
⎝ 2⎠ sin ( 360 × y )
- -
------------------------------ + -----------------------------
2 2
{ 360 mul sin 2 div exch 2 div 360 mul sin 2 div add }
InvertedDouble
⎛ sin ⎛ 360 × --⎞ x ⎞
⎜ ⎝ 2⎠ sin ( 360 × y ) ⎟
– ⎜ ------------------------------ + ----------------------------- ⎟
- -
⎜ 2 2 ⎟
⎝ ⎠
{ 360 mul sin 2 div exch 2 div 360 mul sin 2 div add neg }
Line −|y|
{ exch pop abs neg }
LineX x
{ pop }