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24 lines
No EOL
507 B
Julia
24 lines
No EOL
507 B
Julia
module Geometry
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export angle2, norm2d, sq_norm2d
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using StaticArrays: SVector
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"""
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angle2(a::SVector{2,Float64}, b::SVector{2,Float64})
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Returns the angle φ from vector a to b while φ ∈ [-π, π].
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"""
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function angle2(a::SVector{2,Float64}, b::SVector{2,Float64})
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θ_a = atan(a[2], a[1])
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θ_b = atan(b[2], b[1])
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θ = θ_b - θ_a
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return rem2pi(θ, RoundNearest)
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end
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sq_norm2d(v::SVector{2,Float64}) = v[1]^2 + v[2]^2
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norm2d(v::SVector{2,Float64}) = sqrt(sq_norm2d(v))
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end # module |