80 lines
2.2 KiB
Lua
80 lines
2.2 KiB
Lua
---@class easable
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---@field public a number @the eased value
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---@field public toa number @the target, uneased value
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---@field protected onUpdateFuncs fun():nil[]
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local eas = {}
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---@param new number @New value to ease to
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---@return void
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function eas:set(new)
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self.toa = new
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end
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---@param new number @New value
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---@return void
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function eas:reset(new)
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self.toa = new
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self.a = new
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end
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---@param new number @How much to add to current value to ease to
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---@return void
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function eas:add(new)
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self.toa = self.toa + new
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end
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---@param func fun(a: number):void @Adds a callback function that will run each time the eased value changes
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---@return void
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function eas:onUpdate(func)
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table.insert(self.onUpdateFuncs, func)
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end
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local easmeta = {}
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easmeta.__index = eas
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easmeta.__name = 'easable'
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function easmeta.__add(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) + ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__sub(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) - ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__mul(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) * ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__div(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) / ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__mod(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) % ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__eq(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) == ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__lt(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) < ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta.__le(a, b)
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return ((type(a) == 'table' and a.a) and a.a or a) <= ((type(b) == 'table' and b.a) and b.a or b)
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end
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function easmeta:__call(dt)
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self.a = mix(self.a, self.toa, dt)
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for _, callback in ipairs(self.onUpdateFuncs) do
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callback(self.a)
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end
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end
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function easmeta:__tostring()
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return tostring(self.a)
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end
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function easmeta:__unm(self)
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return -self.a
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end
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---@param default number
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---@return easable
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function easable(default)
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default = default or 0
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return setmetatable({a = default, toa = default, onUpdateFuncs = {}}, easmeta)
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end |