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ESO Lua File v100026

libraries/zo_particles/zo_particlevaluegenerators.lua

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--Particle Value Generator
ZO_ParticleValueGenerator = ZO_Object:Subclass()
function ZO_ParticleValueGenerator:New(...)
    local obj = ZO_Object.New(self)
    obj:Initialize(...)
    return obj
end
function ZO_ParticleValueGenerator:Initialize()
end
function ZO_ParticleValueGenerator:Generate()
    --For multi-value generators you can generate all of them together here
end
function ZO_ParticleValueGenerator:GetValue(i)
    --Return one or more values
    assert(false)
end
--Uniform Random Generator
ZO_UniformRangeGenerator = ZO_ParticleValueGenerator:Subclass()
function ZO_UniformRangeGenerator:New(...)
    return ZO_ParticleValueGenerator.New(self, ...)
end
function ZO_UniformRangeGenerator:Initialize(...)
    for i = 1, select("#", ...) do
        self[i] = select(i, ...)
    end
end
function ZO_UniformRangeGenerator:Generate()
    self.randomValue = zo_random()
end
local lerp = zo_lerp
function ZO_UniformRangeGenerator:GetValue(i)
    return lerp(self[i * 2 - 1], self[i * 2], self.randomValue)
end
--Random Choice Generator
ZO_WeightedChoiceGenerator = ZO_ParticleValueGenerator:Subclass()
function ZO_WeightedChoiceGenerator:New(...)
    return ZO_ParticleValueGenerator.New(self, ...)
end
function ZO_WeightedChoiceGenerator:Initialize(...)
    self.choices = {}
    self.weights = {}
    self.totalWeights = 0 
    for i = 1, select("#", ...), 2 do
        local choice = select(i, ...)
        local weight = select(i + 1, ...)
        table.insert(self.choices, choice)
        table.insert(self.weights, weight)
        self.totalWeights = self.totalWeights + weight
    end
end
function ZO_WeightedChoiceGenerator:Generate()
    self.randomValue = zo_random() * self.totalWeights
end
function ZO_WeightedChoiceGenerator:GetValue(i)
    local currentWeightTotal = 0
    local choiceIndex = 0
    local numChoices = #self.choices
    while currentWeightTotal <= self.randomValue and choiceIndex < numChoices do
        choiceIndex = choiceIndex + 1
        currentWeightTotal = currentWeightTotal + self.weights[choiceIndex]
    end
    local choice = self.choices[choiceIndex]
    if type(choice) == "table" then
        return choice[i]
    else
        return choice
    end
end