forked from endernon/PGRData
59 lines
No EOL
1.2 KiB
Lua
59 lines
No EOL
1.2 KiB
Lua
local math = math
|
||
|
||
local mathFloor = math.floor
|
||
local mathRandom = math.random
|
||
|
||
XMath = XMath or {}
|
||
|
||
function XMath.RandByWeights(weights)
|
||
local weightSum = 0
|
||
for i = 1, #weights do
|
||
weightSum = weightSum + weights[i]
|
||
end
|
||
|
||
local rand = mathRandom(weightSum)
|
||
local curWeight = 0
|
||
for i = 1, #weights do
|
||
local weight = weights[i]
|
||
curWeight = curWeight + weight
|
||
if rand < curWeight then
|
||
return i
|
||
end
|
||
end
|
||
|
||
return #weights
|
||
end
|
||
|
||
function XMath.Clamp(value, min, max)
|
||
if value < min then
|
||
return min
|
||
end
|
||
if value > max then
|
||
return max
|
||
end
|
||
return value
|
||
end
|
||
|
||
|
||
--==============================--
|
||
--desc: 转换成整数，浮点数四舍五入
|
||
--==============================--
|
||
XMath.ToInt = function(val)
|
||
if not val then return end
|
||
return mathFloor(val + 0.5)
|
||
end
|
||
|
||
--==============================--
|
||
--desc: 转换成整数，浮点数向下取整数
|
||
--==============================--
|
||
XMath.ToMinInt = function(val)
|
||
if not val then return end
|
||
return mathFloor(val)
|
||
end
|
||
|
||
--==============================--
|
||
--desc: 最大整数，与C#一致
|
||
--==============================--
|
||
XMath.IntMax = function()
|
||
return 2147483647
|
||
end |