CVec.hs

   1 -- This file is part of Intricacy
   2 -- Copyright (C) 2013 Martin Bays <mbays@sdf.org>
   3 --
   4 -- This program is free software: you can redistribute it and/or modify
   5 -- it under the terms of version 3 of the GNU General Public License as
   6 -- published by the Free Software Foundation, or any later version.
   7 --
   8 -- You should have received a copy of the GNU General Public License
   9 -- along with this program.  If not, see http://www.gnu.org/licenses/.
  10
  11 module CVec where
  12
  13 import           Data.Monoid
  14 import           Data.Semigroup as Sem
  15 import           Hex
  16
  17 data CVec = CVec { cy, cx :: Int }
  18     deriving (Eq, Ord, Show)
  19 instance Sem.Semigroup CVec where
  20     (CVec y x) <> (CVec y' x') = CVec (y+y') (x+x')
  21 instance Monoid CVec where
  22     mempty = CVec 0 0
  23     mappend = (Sem.<>)
  24 instance Grp CVec where
  25     neg (CVec y x) = CVec (-y) (-x)
  26 type CCoord = PHS CVec
  27
  28 hexVec2CVec :: HexVec -> CVec
  29 hexVec2CVec (HexVec x y z) = CVec (-y) (x-z)
  30 cVec2HexVec :: CVec -> HexVec
  31 cVec2HexVec (CVec y x) = HexVec ((x+y)`div`2) (-y) ((y-x)`div`2)
  32
  33 truncateCVec :: CVec -> CVec
  34 truncateCVec (CVec x y) = CVec (max 0 x) (max 0 y)