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stdlib.easable: rewrite

This commit is contained in:
Jill 2023-05-04 21:57:54 +03:00
parent 6a0cb734db
commit 1bc3604f9f
Signed by: oat
GPG Key ID: 33489AA58A955108
1 changed files with 28 additions and 58 deletions
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86
stdlib/easable.lua
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@ -1,72 +1,42 @@
require('stdlib.util')
---@class easable
---@field public a number @the eased value
---@field public toa number @the target, uneased value
local eas = {}
---@field eased number | any
---@field target number | any
---@field speed number
local easable = {}
---@param new number @New value to ease to
---@return void
function eas:set(new)
self.toa = new
--- move towards a new target
function easable:set(n)
self.target = n
end
---@param new number @New value
---@return void
function eas:reset(new)
self.toa = new
self.a = new
--- move towards a new target additively
function easable:add(n)
self.target = self.target + n
end
---@param new number @How much to add to current value to ease to
---@return void
function eas:add(new)
self.toa = self.toa + new
--- set both the eased value and the target
function easable:reset(n)
self.target = n
self.eased = n
end
local easmeta = {}
easmeta.__index = eas
easmeta.__name = 'easable'
function easmeta.__add(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) + ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__sub(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) - ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__mul(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) * ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__div(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) / ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__mod(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) % ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__eq(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) == ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__lt(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) < ((type(b) == 'table' and b.a) and b.a or b)
end
function easmeta.__le(a, b)
return ((type(a) == 'table' and a.a) and a.a or a) <= ((type(b) == 'table' and b.a) and b.a or b)
---@param dt number
function easable:update(dt)
self.eased = math.pow(self.speed, -dt) * (self.eased - self.target) + self.target
end
function easmeta:__call(dt)
self.a = mix(self.a, self.toa, dt)
end
function easmeta:__tostring()
return tostring(self.a)
end
function easmeta:__unm(self)
return -self.a
function easable:__tostring()
return 'easable (' .. self.eased .. ' towards ' .. self.target .. ')'
end
---@param default number
easable.__index = easable
easable.__name = 'easable'
---@return easable
return function(default)
default = default or 0
return setmetatable({a = default, toa = default}, easmeta)
return function(default, speed)
return setmetatable({
eased = default,
target = default,
speed = speed and math.pow(2, speed) or 2
}, easable)
end