四舍五入到最近的整数。
round(x)
attr x = round(x)
@StartRule
Lot --> primitiveCube(8, 0.2, 4)
split(x) { round(2.4) : Red | round(2.6) : Green | round(2.5) : Blue }
Red --> color(1, 0.3, 0.3)
Green --> color(0.3, 1, 0.3)
Blue --> color(0.3, 0.3, 1)