-- |
--
--

module Data.Geometry where

type Coord = Int

type Point = (Coord, Coord)

type Size = (Int, Int)
-- data Size = Size Int Int

type Origin = Point

-- |
--
--  Origin
--     *---
--     |
--     |  Size
--
--
data Region = Rectangle Origin Size deriving Show

-- downSample :: Size -> Int -> Size
-- downSample (w, h) factor = (w `div` factor, h `div` factor)

translate :: Point -> Point -> Point
translate (ox, oy) (x, y) = (ox + x, oy + y)

-- |
-- Makes rectangle region.
--
-- Second argument is center of the rectangle
withCenter :: Size -> Point -> Region
size@(w, h) `withCenter` o = Rectangle o' size
    where
        o' = translate o (-w `div` 2, -h `div` 2)

points :: Region -> [Point]
points (Rectangle (ox, oy) (w, h)) = [(x, y) | y <- [oy .. (oy + h)], x <- [ox .. (ox + w)]]