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local DEFAULT_APPROACH_FACTOR = 7 / 60
self . currentValue = initialValue
self . targetBase = initialValue
self . resetValue = initialValue
self . approachFactor = DEFAULT_APPROACH_FACTOR
end
self . approachFactor = approachFactor
end
local NO_PARAMS = { }
params = params or NO_PARAMS
if params . fluxMin then
self . targetBase = ( params . fluxMin + params . fluxMax ) / 2
self . fluxMagnitude = ( params . fluxMax - params . fluxMin ) / 2 -- half up, half down
else
self . targetBase = params . base
self . fluxMagnitude = params . fluxMagnitude
end
self . fluxPeriodSeconds = params . fluxPeriodSeconds
self . fluxPhase = params . fluxPhase
self . useRandomFlux = params . useRandomFlux
if self . targetBase == nil then
self . targetBase = self . resetValue
end
if self . currentValue == nil then
self . currentValue = self . targetBase
end
end
end
self . currentValue = currentValue
end
self . targetBase = targetBase
if self . currentValue == nil then
self . currentValue = self . targetBase
end
end
self . fluxFunction = fluxFunction
end
local fluxMagnitude = self . fluxMagnitude or 0
if not ( self . currentValue == self . targetBase and fluxMagnitude == 0 ) then
local targetFinal = self . targetBase
if fluxMagnitude ~= 0 then
local fluxPeriodSeconds = self . fluxPeriodSeconds or 2
local fluxPhase = self . fluxPhase or 0
local normalizedTime = ( timeSecs / fluxPeriodSeconds ) + fluxPhase
local progress = normalizedTime % 1
local flux
if self . useRandomFlux then
-- this implements a sample-and-hold like pattern;
-- every period we will sample a random value and hold it until the next period
-- if you'd like something less jumpy, use the approach factor to smooth it out
if self . lastPeriod == nil or period > self . lastPeriod then
self . lastRandomFlux = flux
self . lastPeriod = period
else
flux = self . lastRandomFlux
end
else
end
targetFinal = targetFinal + flux * fluxMagnitude
end
self . currentValue = targetFinal
end
end
end
return self . currentValue
end |