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[refactor]: use fromPolar() in randomDirection()

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More compact code and one less temporary table in
vector:randomDirection()
This commit is contained in:
Matthias Richter 2017-11-04 11:19:27 +01:00
parent cdafc00075
commit 96c9648a62
2 changed files with 8 additions and 10 deletions
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11
vector-light.lua
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@ -87,14 +87,11 @@ local function randomDirection(len_min, len_max)
len_min = len_min or 1 len_min = len_min or 1
len_max = len_max or len_min len_max = len_max or len_min
assert(len_max > 0, "randomDirection: len_max must be greater than zero") assert(len_max > 0, "len_max must be greater than zero")
assert(len_max >= len_min, "randomDirection: len_max must be greater than or equal to len_min") assert(len_max >= len_min, "len_max must be greater than or equal to len_min")
local range = len_max - len_min return fromPolar(math.random()*2*math.pi,
local rnd = math.random() * range math.random() * (len_max-len_min) + len_min)
local x,y = fromPolar(math.random()*2*math.pi)
return x * (rnd + len_min), y * (rnd + len_min)
end end
local function toPolar(x, y) local function toPolar(x, y)

7
vector.lua
View File

@ -44,12 +44,13 @@ local function randomDirection(len_min, len_max)
len_min = len_min or 1 len_min = len_min or 1
len_max = len_max or len_min len_max = len_max or len_min
assert(len_max > 0, "randomDirection: len_max must be greater than zero") assert(len_max > 0, "len_max must be greater than zero")
assert(len_max >= len_min, "randomDirection: len_max must be greater than or equal to len_min") assert(len_max >= len_min, "len_max must be greater than or equal to len_min")
local range = len_max - len_min local range = len_max - len_min
local rnd = math.random() * range local rnd = math.random() * range
return fromPolar(math.random()*2*math.pi) * (rnd + len_min) return fromPolar(math.random()*2*math.pi,
math.random() * (len_max-len_min) + len_min)
end end
local function isvector(v) local function isvector(v)