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module Spear.Math.Spatial3
where
import Spear.Math.Vector3
import Spear.Math.Matrix4 as M
class Spatial3 s where
-- | Move the 'Spatial'.
move :: Vector3 -> s -> s
-- | Move the 'Spatial' forwards.
moveFwd :: Float -> s -> s
-- | Move the 'Spatial' backwards.
moveBack :: Float -> s -> s
-- | Make the 'Spatial' strafe left.
strafeLeft :: Float -> s -> s
-- | Make the 'Spatial' Strafe right.
strafeRight :: Float -> s -> s
-- | Rotate the 'Spatial' about its local X axis.
pitch :: Float -> s -> s
-- | Rotate the 'Spatial' about its local Y axis.
yaw :: Float -> s -> s
-- | Rotate the 'Spatial' about its local Z axis.
roll :: Float -> s -> s
-- | Get the 'Spatial''s position.
pos :: s -> Vector3
-- | Get the 'Spatial''s forward vector.
fwd :: s -> Vector3
-- | Get the 'Spatial''s up vector.
up :: s -> Vector3
-- | Get the 'Spatial''s right vector.
right :: s -> Vector3
-- | Get the 'Spatial''s transform.
transform :: s -> Matrix4
-- | Set the 'Spatial''s transform.
setTransform :: Matrix4 -> s -> s
-- | Set the 'Spatial''s position.
setPos :: Vector3 -> s -> s
-- | Make the 'Spatial' look at the given point.
lookAt :: Vector3 -> s -> s
lookAt pt s =
let position = pos s
fwd = normalise $ pt - position
r = fwd `cross` unitY
u = r `cross` fwd
in
setTransform (M.transform r u (-fwd) position) s
-- | Make the 'Spatial' orbit around the given point
orbit :: Vector3 -- ^ Target point
-> Float -- ^ Horizontal angle
-> Float -- ^ Vertical angle
-> Float -- ^ Orbit radius.
-> s
-> s
orbit pt anglex angley radius s =
let ax = anglex * pi / 180
ay = angley * pi / 180
sx = sin ax
sy = sin ay
cx = cos ax
cy = cos ay
px = (x pt) + radius*cy*sx
py = (y pt) + radius*sy
pz = (z pt) + radius*cx*cy
in
setPos (vec3 px py pz) s
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