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compensating for stripe depth

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This commit is contained in:
Jonas Betzendahl 2014-05-16 15:58:07 +02:00
parent 1c1aedda30
commit 15d55e1577
2 changed files with 15 additions and 13 deletions
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1
src/Map/Graphics.hs
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@ -30,7 +30,6 @@ import Linear
import Control.Arrow ((***))
import Map.Types
import Map.Creation
type Height = Float

25
src/Map/Map.hs
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@ -38,7 +38,7 @@ giveNeighbourhood mp n (a,b) = let ns = giveNeighbours mp (a,b) in
remdups . concat $ ns : map (giveNeighbourhood mp (n-1)) ns
-- | Calculates the height of any given point on the map.
-- Does not add camera distance to ground to that.
-- Does not add camera distance to ground to that.
--
-- This ueses barycentric coordinate stuff. Wanna read more?
-- http://en.wikipedia.org/wiki/Barycentric_coordinate_system_%28mathematics%29
@ -48,14 +48,14 @@ giveMapHeight :: PlayMap
-> (Float, Float) -- ^ Coordinates on X/Z-axes
-> Float -- ^ Terrain Height at that position
giveMapHeight mp (x,z)
| outsideMap (x,z) = 0.0
| (isInt z 6) && (isInt x 6) = hlu (round x, round z)
| (isInt z 6) = let dist_down = x - fromIntegral ((floor x) :: Int)
dist_up = fromIntegral ((ceiling x) :: Int) - x
in (1 - dist_down) * (hlu (floor x, round z)) + (1 - dist_up) * (hlu (ceiling x, round z))
| (isInt x 6) = let dist_down = z - fromIntegral ((floor z) :: Int)
| outsideMap (x',z) = 0.0
| (isInt z 6) && (isInt x' 6) = hlu (round x', round z)
| (isInt z 6) = let dist_down = x' - fromIntegral ((floor x') :: Int)
dist_up = fromIntegral ((ceiling x') :: Int) - x'
in (1 - dist_down) * (hlu (floor x', round z)) + (1 - dist_up) * (hlu (ceiling x', round z))
| (isInt x' 6) = let dist_down = z - fromIntegral ((floor z) :: Int)
dist_up = fromIntegral ((ceiling z) :: Int) - z
in (1 - dist_down) * (hlu (round x, floor z)) + (1 - dist_up) * (hlu (round x, ceiling z))
in (1 - dist_down) * (hlu (round x', floor z)) + (1 - dist_up) * (hlu (round x', ceiling z))
| otherwise = let [a,b,c] = getTrianglePoints [tff,tfc,tcf,tcc]
ar = area (fi a) (fi b) (fi c)
λa = area (fi b) (fi c) (x, z) / ar
@ -64,6 +64,9 @@ giveMapHeight mp (x,z)
in (λa * hlu a) + (λb * hlu b) + (λc * hlu c)
where
-- compensating
x' = x * ((sqrt 3) / 2)
--Returns if q is an int to n decimal places
isInt :: RealFrac b => b -> Int -> Bool
isInt q n = (round $ 10^((fromIntegral n) :: Integer) * (q - (fromIntegral ((round q):: Integer)))) == (0 :: Integer)
@ -94,9 +97,9 @@ giveMapHeight mp (x,z)
getTrianglePoints = ((take 3) . (map fst) . (sortBy (compare `on` snd)))
dist :: (Float, Float) -> (Int, Int) -> Float
dist (x1,z1) (x2,z2) = let x' = x1 - fromIntegral x2
z' = z1 - fromIntegral z2
in sqrt $ x'*x' + z'*z'
dist (x1,z1) (x2,z2) = let xf = x1 - fromIntegral x2
zf = z1 - fromIntegral z2
in sqrt $ xf*xf + zf*zf
-- Heron's Formula: http://en.wikipedia.org/wiki/Heron%27s_formula
area :: (Float, Float) -> (Float, Float) -> (Float, Float) -> Float