module Cell where
import Graphics.Gloss
data Cell = Cell Point -- centre
Float -- radius
Int -- remaining lifetime
deriving Show
-- Produce a new cell of a certain relative radius at a certain angle.
-- The factor argument is in the range [0..1] so spawned cells are
-- smaller than their parent.
-- The check whether it fits in the community is elsewhere.
offspring :: Cell -> Float -> Float -> Int -> Cell
offspring (Cell (x,y) r _) alpha factor lifespan =
Cell (x + (childR+r) * cos alpha, y + (childR+r) * sin alpha)
childR
lifespan
where childR = factor * r
-- Do two cells overlap?
-- Used to decide if newly spawned cells can join the community.
overlap :: Cell -> Cell -> Bool
overlap (Cell (x1,y1) r1 _) (Cell (x2,y2) r2 _) = centreDist < (r1 + r2) *0.999
where centreDist = sqrt(xdiff*xdiff + ydiff*ydiff)
xdiff = x1 - x2
ydiff = y1 - y2
-- thickness of circle is determined by lifespan
render :: Cell -> Picture
render (Cell (x,y) r life)
= Color (makeColor 0.6 z 0.6 1.0)
$ Translate x y
$ ThickCircle (r - thickness / 2) thickness
where z = fromIntegral life * 0.12
thickness = fromIntegral life