- Reestructuració completa

data/utils/tweening.lua

@@ -0,0 +1,164 @@
+local pi = math.pi
+local sin = math.sin
+local cos = math.cos
+local abs = math.abs
+
+local function backIn(t, s) s = s or 1.70158; return t * t * ((s + 1) * t - s) end
+local function backOut(t, s) s = s or 1.70158; t = t - 1; return 1 + t * t * ((s + 1) * t + s) end
+local function backInOut(t, s)
+    s = s or 1.70158
+    if t < 0.5 then
+        local tt = 2 * t
+        return (tt * tt * ((s * 1.525 + 1) * tt - s * 1.525)) / 2
+    else
+        local tt = 2 * t - 2
+        return (2 + tt * tt * ((s * 1.525 + 1) * tt + s * 1.525)) / 2
+    end
+end
+
+-- Bounce (helper)
+local function bounceOut(t)
+    local n1 = 7.5625
+    local d1 = 2.75
+    if t < 1 / d1 then
+        return n1 * t * t
+    elseif t < 2 / d1 then
+        t = t - 1.5 / d1
+        return n1 * t * t + 0.75
+    elseif t < 2.5 / d1 then
+        t = t - 2.25 / d1
+        return n1 * t * t + 0.9375
+    else
+        t = t - 2.625 / d1
+        return n1 * t * t + 0.984375
+    end
+end
+
+easing = {} local me = easing
+
+function me.linear(t) return t end
+
+-- Sine
+function me.easeInSine(t) return 1 - cos((t * pi) / 2) end
+function me.easeOutSine(t) return sin((t * pi) / 2) end
+function me.easeInOutSine(t) return -(cos(pi * t) - 1) / 2 end
+
+-- Quad
+function me.easeInQuad(t) return t * t end
+function me.easeOutQuad(t) return 1 - (1 - t) * (1 - t) end
+function me.easeInOutQuad(t)
+    if t < 0.5 then return 2 * t * t end
+    return 1 - ((-2 * t + 2)^2) / 2
+end
+
+-- Cubic
+function me.easeInCubic(t) return t * t * t end
+function me.easeOutCubic(t) return 1 - ((1 - t)^3) end
+function me.easeInOutCubic(t)
+    if t < 0.5 then return 4 * t * t * t end
+    return 1 - ((-2 * t + 2)^3) / 2
+end
+
+-- Expo
+function me.easeInExpo(t) return (t == 0) and 0 or (2^(10 * t - 10)) end
+function me.easeOutExpo(t) return (t == 1) and 1 or 1 - (2^(-10 * t)) end
+function me.easeInOutExpo(t)
+    if t == 0 then return 0 end
+    if t == 1 then return 1 end
+    if t < 0.5 then return (2^(20 * t - 10)) / 2 end
+    return (2 - (2^(-20 * t + 10))) / 2
+end
+
+-- Back (overshoot)
+function me.easeInBack(t) return backIn(t) end
+function me.easeOutBack(t) return backOut(t) end
+function me.easeInOutBack(t) return backInOut(t) end
+
+-- Elastic
+function me.easeInElastic(t)
+    if t == 0 then return 0 end
+    if t == 1 then return 1 end
+    local c4 = (2 * pi) / 3
+    return -(2^(10 * t - 10)) * sin((t * 10 - 10.75) * c4)
+end
+function me.easeOutElastic(t)
+    if t == 0 then return 0 end
+    if t == 1 then return 1 end
+    local c4 = (2 * pi) / 3
+    return (2^(-10 * t)) * sin((t * 10 - 0.75) * c4) + 1
+end
+function me.easeInOutElastic(t)
+    if t == 0 then return 0 end
+    if t == 1 then return 1 end
+    local c5 = (2 * pi) / 4.5
+    if t < 0.5 then
+        return -((2^(20 * t - 10)) * sin((20 * t - 11.125) * c5)) / 2
+    end
+    return ((2^(-20 * t + 10)) * sin((20 * t - 11.125) * c5)) / 2 + 1
+end
+
+-- Bounce
+function me.easeInBounce(t) return 1 - bounceOut(1 - t) end
+function me.easeOutBounce(t) return bounceOut(t) end
+function me.easeInOutBounce(t)
+    if t < 0.5 then return (1 - bounceOut(1 - 2 * t)) / 2 end
+    return (1 + bounceOut(2 * t - 1)) / 2
+end
+
+
+tweening = {
+    list = {},
+} me = tweening
+
+function me.add(from, to, duration, easingFun, callback)
+    local tween = {
+        from = from,
+        to = to,
+        duration = math.max(0.000001, duration or 0.001),
+        easing = easingFun,
+        callback = callback,
+        t = 0,
+    }
+    me.list[#me.list + 1] = tween
+    return tween
+end
+
+function me.update(dt)
+    if #me.list==0 then return end
+
+    -- iterate backwards so we can remove finished tweens safely
+    for i = #me.list, 1, -1 do
+        local tw = me.list[i]
+        tw.t = tw.t + (dt or 0)
+        local progress = tw.t / tw.duration
+        if progress >= 1 then
+            -- finished: ensure final value, call callback with finished=true, remove
+            local value = tw.to
+            if tw.callback then
+                -- callback(value, normalizedProgress, finished)
+                tw.callback(value, 1, true)
+            end
+            table.remove(me.list, i)
+        else
+            -- in progress
+            local alpha = tw.easing(progress)
+            local value = tw.from + (tw.to - tw.from) * alpha
+            if tw.callback then tw.callback(value, progress, false) end
+        end
+    end
+end
+
+function me.clear()
+    for i = #me.list, 1, -1 do table.remove(me.list, i) end
+end
+
+-- Optional helper: cancel a specific tween (pass the tween returned by add)
+function me.cancel(tween)
+    for i = #me.list, 1, -1 do
+        if me.list[i] == tween then
+            table.remove(me.list, i)
+            return true
+        end
+    end
+    return false
+end