Estructura DX i escena logo JAILGAMES animada

pepe_pintor_dx/lib/easing.lua

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+-- Funcions de suavitzat — entrada t in [0, 1], sortida ~[0, 1].
+-- Algunes (back/bounce) poden sortir de [0,1] temporalment.
+--
+-- Referencia: https://easings.net  (versions clausurades algebraicament)
+
+local M = {}
+
+function M.linear(t)
+    return t
+end
+
+function M.inQuad(t)
+    return t * t
+end
+
+function M.outQuad(t)
+    local u = 1 - t
+    return 1 - u * u
+end
+
+function M.inOutQuad(t)
+    if t < 0.5 then
+        return 2 * t * t
+    else
+        local u = 2 * (1 - t)
+        return 1 - 0.5 * u * u
+    end
+end
+
+function M.inCubic(t)
+    return t * t * t
+end
+
+function M.outCubic(t)
+    local u = 1 - t
+    return 1 - u * u * u
+end
+
+-- Botet: cau, rebota, cau, rebota mes petit, ... fins quedar-se.
+function M.outBounce(t)
+    local n = 7.5625
+    local d = 2.75
+    if t < 1/d then
+        return n * t * t
+    elseif t < 2/d then
+        local u = t - 1.5/d
+        return n * u * u + 0.75
+    elseif t < 2.5/d then
+        local u = t - 2.25/d
+        return n * u * u + 0.9375
+    else
+        local u = t - 2.625/d
+        return n * u * u + 0.984375
+    end
+end
+
+-- Overshoot (es passa del valor i torna).
+function M.outBack(t)
+    local c1 = 1.70158
+    local c3 = c1 + 1
+    local u = t - 1
+    return 1 + c3 * u * u * u + c1 * u * u
+end
+
+function M.inBack(t)
+    local c1 = 1.70158
+    local c3 = c1 + 1
+    return c3 * t * t * t - c1 * t * t
+end
+
+return M