easing.js

easing.js

function ease(p) {
    p *= 5;

    if (p < 1) {
        return (-0.9 * Math.cos(p * (Math.PI / 2)) + 0.9 + (0.1 * p)) * 0.3;
    } else {
        p = ((p - 1) / 4);
        var p1 = p - 1;
        return (((p1 * p1 * p1 + 1) * 0.9) + p * 0.1) * 0.7 + 0.3;
    }
}
$.ease = ease;


// Approximate to cubic-bezier(0.42, 0.0, 1.0, 1.0)
function easeIn(p)
{
    return -0.9 * Math.cos(p * (Math.PI / 2)) + 0.9 + (0.1 * p);
}
$.easeIn = easeIn;


// Approximate to cubic-bezier(0.0, 0.0, 0.58, 1.0).
function easeOut(p)
{
    return (Math.sin(p * (Math.PI / 2)) * 0.9) + (0.1 * p);
}
$.easeOut = easeOut;


// Approximate to cubic-bezier(0.42, 0.0, 0.58, 1.0)
function easeInOut(p)
{
    return -0.5 * (Math.cos(Math.PI * p) - 1);
}
$.easeInOut = easeInOut;