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 Hex
  14 import Data.Monoid
  15
  16 data CVec = CVec { cy, cx :: Int }
  17     deriving (Eq, Ord, Show)
  18 instance Monoid CVec where
  19     mempty = CVec 0 0
  20     mappend (CVec y x) (CVec y' x') = CVec (y+y') (x+x')
  21 instance Grp CVec where
  22     neg (CVec y x) = CVec (-y) (-x)
  23 type CCoord = PHS CVec
  24
  25 hexVec2CVec :: HexVec -> CVec
  26 hexVec2CVec (HexVec x y z) = CVec (-y) (x-z)
  27 cVec2HexVec :: CVec -> HexVec
  28 cVec2HexVec (CVec y x) = HexVec ((x+y)`div`2) (-y) ((y-x)`div`2)
  29
  30 truncateCVec :: CVec -> CVec
  31 truncateCVec (CVec x y) = CVec (max 0 x) (max 0 y)