79 lines
3.1 KiB
Haskell
79 lines
3.1 KiB
Haskell
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{-# LANGUAGE RankNTypes #-}
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module Render.Types (createFlatCam, createSphereCam, Camera, GLCamera(..)) where
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import Linear
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import Foreign.C (CFloat)
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import Render.Misc (lookAt)
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type Distance = Double
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type Pitch = Double
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type Yaw = Double
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class GLCamera a where
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getCam :: a -> Distance -> Pitch -> Yaw -> M44 CFloat
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moveBy :: a -> (Position -> Position) -> a
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move :: a -> Position -> a
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type Position = (Double, Double)
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type Radius = Double
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data Camera = Flat Position
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| Sphere Position Radius
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-- | create a Flatcam-Camera starting at given x/z-Coordinates
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createFlatCam :: Double -> Double -> Camera
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createFlatCam x z = Flat (x,z)
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-- | create a Flatcam-Camera starting at given pitch/azimuth/radius
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createSphereCam :: Double -> Double -> Double -> Camera
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createSphereCam p a r = Sphere (p,a) r
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instance GLCamera Camera where
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getCam (Flat (x',z')) dist' xa' ya' =
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lookAt (cpos ^+^ at') at' up
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where
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at' = V3 x 0 z
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cpos = crot !* (V3 0 0 (-dist))
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crot = (
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(fromQuaternion $ axisAngle upmap (xa::CFloat))
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!*!
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(fromQuaternion $ axisAngle (V3 0 1 0) (ya::CFloat))
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) ::M33 CFloat
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upmap = ((fromQuaternion $ axisAngle (V3 0 1 0) (ya::CFloat)) :: M33 CFloat)
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!* (V3 1 0 0)
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x = realToFrac x'
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z = realToFrac z'
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dist = realToFrac dist'
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xa = realToFrac xa'
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ya = realToFrac ya'
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up = V3 0 1 0
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getCam (Sphere (inc',az') r') dist' xa' ya' = --inclination (pitch), azimuth (yaw)
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lookAt (cpos ^+^ at') at' up
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where
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at' = sphereToCart r inc az
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cpos = crot !* (V3 0 0 (-dist))
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crot = (
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(fromQuaternion $ axisAngle upmap (xa::CFloat))
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!*!
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(fromQuaternion $ axisAngle (V3 0 1 0) (ya::CFloat))
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) ::M33 CFloat
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upmap = ((fromQuaternion $ axisAngle (V3 0 1 0) (ya::CFloat)) :: M33 CFloat)
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!* (V3 1 0 0)
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up = (sphereToCart (r+1) inc az) ^-^ at'
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r = realToFrac r'
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inc = realToFrac inc'
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az = realToFrac az'
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dist = realToFrac dist'
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xa = realToFrac xa'
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ya = realToFrac ya'
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moveBy (Sphere (inc, az) r) f = undefined
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moveBy (Flat (x', z')) f = Flat (f (x',z'))
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move c (x', z') = moveBy c (\(x,z) -> (x+x',z+z'))
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sphereToCart :: (Floating a) => a -> a -> a -> V3 a
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sphereToCart r inc az = V3
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(r * (sin inc) * (cos az))
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(r * (sin inc) * (sin az))
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(r * (cos inc))
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