Unicursal hexagram in Elm

gistfile1.elm

import Color exposing (..)
import Graphics.Collage exposing (..)
import Graphics.Element exposing (..)

hexagon : Color -> Form
hexagon clr = outlined (solid clr) (ngon 6 150)

hex_on_a_point : Float -> Color -> Form
hex_on_a_point deg clr = rotate (degrees deg) (hexagon clr)


uni_path : Path
uni_path = 
  let radius = 150
      angle = 30
      radians= angle/180.0 * pi
      factor1 = cos radians
      factor2 = sin radians
      number = factor1 * radius
      half = factor2 * radius
  in
      path [ 
        (0,radius), 
        (-number,-half), 
        (number,half), 
        (0,-radius),
        (-number,half),
        (number,-half), 
        (0,radius)
      ]

unicursal : Color -> Form
unicursal clr = outlined (solid clr) uni_path

main : Element
main =
     collage 300 300
        [ filled black (circle 150)
        , hex_on_a_point 90 green
        , unicursal red
        ]