remove leftover tuple conversions (#59)

src/MicrobeAgents.jl

@@ -28,8 +28,8 @@ microbe type lives (1, 2 and 3 are supported).
 
 All microbe types *must* have at least the following fields:
 - `id::Int` id of the microbe (used internally by Agents.jl)
-- `pos::NTuple{D,Float64}` position of the microbe
-- `vel::NTuple{D,Float64}` velocity of the microbe
+- `pos::SVectpr{D,Float64}` position of the microbe
+- `vel::SVector{D,Float64}` velocity of the microbe
 - `motility::AbstractMotility` motile pattern of the microbe
 - `turn_rate::Real` average reorientation rate of the microbe
 - `rotational_diffusivity::Real` coefficient of brownian rotational diffusion

src/rotations.jl

@@ -3,7 +3,7 @@ function turn!(microbe::AbstractMicrobe, model)
     # extract new speed and rotation angles
     U₁, θ, ϕ = rand(abmrng(model), microbe.motility)
     # reorient and update speed
-    microbe.vel = Tuple(rotate(v, θ, ϕ))
+    microbe.vel = rotate(v, θ, ϕ)
     microbe.speed = U₁
     # switch motile state (does nothing if motility is one-step)
     switch!(microbe.motility)
@@ -21,12 +21,10 @@ function rotational_diffusion!(microbe::AbstractMicrobe, model)
     σ = sqrt(2*D_rot*dt)
     θ = rand(abmrng(model), Normal(0,σ))
     ϕ = rand(abmrng(model), Arccos())
-    microbe.vel = Tuple(rotate(microbe.vel, θ, ϕ))
+    microbe.vel = rotate(microbe.vel, θ, ϕ)
     nothing
 end
 
-rotate(w::Tuple, θ, ϕ) = rotate(SVector(w), θ, ϕ)
-
 """
     rotate(w::SVector{D}, θ, ϕ) where D
 Rotate `D`-dimensional vector `w` by angles `θ` and `ϕ`.