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Improve vector utils

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This commit is contained in:
Lars Mueller 2020-12-19 15:28:53 +01:00
parent cc7a22ea76
commit 2f01c5716b
1 changed files with 20 additions and 4 deletions
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24
vector.lua
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@ -9,6 +9,10 @@ function from_xyzw(v)
return new{v.x, v.y, v.z, v.w} return new{v.x, v.y, v.z, v.w}
end end
function from_minetest(v)
return new{v.x, v.y, v.z}
end
function to_xyzw(v) function to_xyzw(v)
return {x = v[1], y = v[2], z = v[3], w = v[4]} return {x = v[1], y = v[2], z = v[3], w = v[4]}
end end
@ -25,10 +29,10 @@ function combine(v1, v2, f)
return new(new_vector) return new(new_vector)
end end
function apply(v, s, f) function apply(v, f, ...)
local new_vector = {} local new_vector = {}
for key, value in pairs(v) do for key, value in pairs(v) do
new_vector[key] = f(value, s) new_vector[key] = f(value, ...)
end end
return new(new_vector) return new(new_vector)
end end
@ -36,8 +40,8 @@ end
function combinator(f) function combinator(f)
return function(v1, v2) return function(v1, v2)
return combine(v1, v2, f) return combine(v1, v2, f)
end, function(v, s) end, function(v, ...)
return apply(v, s, f) return apply(v, f, ...)
end end
end end
@ -61,3 +65,15 @@ end
function normalize(v) function normalize(v)
return divide_scalar(v, length(v)) return divide_scalar(v, length(v))
end end
function floor(v)
return apply(v, math.floor)
end
function ceil(v)
return apply(v, math.ceil)
end
function clamp(v, min, max)
return apply(apply(v, math.max, min), math.min, max)
end