LibEasing

A World of Warcraft library addon for providing easing formulas and a convience function to apply them.

These functions were gotten from EmmanuelOga, and are an application of Robert Penner's Easing Equations, which are provided under the BSD License and © 2001 Robert Penner.

Usage

As with any LibStub based libary, get a library access object first

local LibEasing = LibStub("LibEasing-1.0");

LibEasing:Ease(func, beginValue, endValue, duration[, easingFunc], [callback])

Calls func(number) once a frame starting at beginValue and going to endValue over duration using the provided easingFunc or InOutQuad if not provided, and calling the optional callback once done

Returns a handle that can be used to cancel the process

local function setShoulderOffset(offset)
    SetCVar("test_cameraOverShoulder", offset)
end

-- sets the shoulder offset to 5 from where ever it was before over a second using InOutQuad as the easing function
-- this will call setShoulderOffset every frame
local easeShoulderOffsetHandle = LibEasing:Ease(setShoulderOffset, tonumber(GetCVar("test_cameraOverShoulder")), 5, 1, LibEasing.InOutQuad);

LibEasing:StopEasing(handle)

Stop the easing on a handle provided by the original LibEasing:Ease(...) call

Provided Easing Formulas

Each provided easing function is provided under the LibEasing table, i.e. LibEasing.MyEasingFunction. Here are a list of provided functions:

t = elapsed time

b = begin

c = change == ending - beginning

d = duration (total time)

• LibEasing.Linear(t, b, c, d)
• LibEasing.InQuad(t, b, c, d)
• LibEasing.OutQuad(t, b, c, d)
• LibEasing.InOutQuad(t, b, c, d)
• LibEasing.OutInQuad(t, b, c, d)
• LibEasing.InCubic(t, b, c, d)
• LibEasing.OutCubic(t, b, c, d)
• LibEasing.InOutCubic(t, b, c, d)
• LibEasing.OutInCubic(t, b, c, d)
• LibEasing.InQuart(t, b, c, d)
• LibEasing.OutQuart(t, b, c, d)
• LibEasing.InOutQuart(t, b, c, d)
• LibEasing.OutInQuart(t, b, c, d)
• LibEasing.InQuint(t, b, c, d)
• LibEasing.OutQuint(t, b, c, d)
• LibEasing.InOutQuint(t, b, c, d)
• LibEasing.OutInQuint(t, b, c, d)
• LibEasing.InSine(t, b, c, d)
• LibEasing.OutSine(t, b, c, d)
• LibEasing.InOutSine(t, b, c, d)
• LibEasing.OutInSine(t, b, c, d)
• LibEasing.InExpo(t, b, c, d)
• LibEasing.OutExpo(t, b, c, d)
• LibEasing.InOutExpo(t, b, c, d)
• LibEasing.OutInExpo(t, b, c, d)
• LibEasing.InCirc(t, b, c, d)
• LibEasing.OutCirc(t, b, c, d)
• LibEasing.InOutCirc(t, b, c, d)
• LibEasing.OutInCirc(t, b, c, d)
• LibEasing.InElastic(t, b, c, d, a, p)
• LibEasing.OutElastic(t, b, c, d, a, p)
• LibEasing.InOutElastic(t, b, c, d, a, p)
• LibEasing.OutInElastic(t, b, c, d, a, p)
• LibEasing.InBack(t, b, c, d, s)
• LibEasing.OutBack(t, b, c, d, s)
• LibEasing.InOutBack(t, b, c, d, s)
• LibEasing.OutInBack(t, b, c, d, s)
• LibEasing.InBounce(t, b, c, d)
• LibEasing.OutBounce(t, b, c, d)
• LibEasing.InOutBounce(t, b, c, d)
• LibEasing.OutInBounce(t, b, c, d)