Minetest-WorldEditAdditions/worldeditadditions/utils/vector.lua
2021-02-23 22:56:56 +00:00

76 lines
2.5 KiB
Lua

worldeditadditions.vector = {}
function worldeditadditions.vector.tostring(v)
return "(" .. v.x ..", " .. v.y ..", " .. v.z ..")"
end
-- Calculates the length squared of the given vector.
-- @param v Vector The vector to operate on
-- @return number The length of the given vector squared
function worldeditadditions.vector.lengthsquared(v)
if not v.y then return v.x*v.x + v.z*v.z end
return v.x*v.x + v.y*v.y + v.z*v.z
end
--- Normalises the given vector such that its length is 1.
-- Also known as calculating the unit vector.
-- This method does *not* mutate.
-- @param v Vector The vector to calculate from.
-- @return Vector A new normalised vector.
function worldeditadditions.vector.normalize(v)
local length = math.sqrt(worldeditadditions.vector.lengthsquared(v))
if not v.y then return {
x = v.x / length,
z = v.z / length
} end
return {
x = v.x / length,
y = v.y / length,
z = v.z / length
}
end
--- Rounds the values in a vector down.
-- Warning: This MUTATES the given vector!
-- @param v Vector The vector to operate on
function worldeditadditions.vector.floor(v)
v.x = math.floor(v.x)
-- Some vectors are 2d, but on the x / z axes
if v.y then v.y = math.floor(v.y) end
-- Some vectors are 2d
if v.z then v.z = math.floor(v.z) end
end
--- Determines if the target point is contained within the defined worldedit region.
-- @param pos1 Vector pos1 of the defined region.
-- @param pos2 Vector pos2 of the defined region.
-- @param target Vector The target vector to check.
-- @return boolean Whether the given target is contained within the defined worldedit region.
function worldeditadditions.vector.is_contained(pos1, pos2, target)
local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
return pos1.x >= target.x
and pos1.y >= target.y
and pos1.z >= target.z
and pos2.x <= target.x
and pos2.y <= target.y
and pos2.z <= target.z
end
--- Expands the defined region to include the given point.
-- @param pos1 Vector pos1 of the defined region.
-- @param pos2 Vector pos2 of the defined region.
-- @param target Vector The target vector to include.
function worldeditadditions.vector.expand_region(pos1, pos2, target)
local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
if target.x < pos1.x then pos1.x = target.x end
if target.y < pos1.y then pos1.y = target.y end
if target.z < pos1.z then pos1.z = target.z end
if target.x > pos2.x then pos2.x = target.x end
if target.y > pos2.y then pos2.y = target.y end
if target.z > pos2.z then pos2.z = target.z end
return pos1, pos2
end