Expressions/Scripts/Presets

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towhid
Topic Author
Posts: 1
Joined: Wed Oct 15, 2014 10:41 pm

Start with Elasticity & End with Overshoot

Thu Jan 22, 2015 2:45 pm

Hey guys,

i am trying create an expression that makes my animation elastic at the start and overshoot at the end using ease n wizz script.
the script can't animate with elasticity and overshoot at the same time, so i am trying to manipulate the functions..

at this point, the result is like this one
Image

but i need something like this
Image

I am really stuck :(

// some defaults
var p = 0.8; // period for elastic
var a = 50; // amplitude for elastic
var s = 1.70158; // overshoot amount for "back"

(easeAndWizz() || value);

function customFunc(t, b, c, d, a, p) {

    var keyCheck = false; // change to "true" if you want to invert the animation order..

    try {
        if (key(2).time > time) {
            keyCheck = 1 - keyCheck;
        } //keyCheck
    } catch (e) {
        return null;
    }


    if (!keyCheck) {
        // inBack Function
        return c * (t /= d) * t * ((s + 1) * t - s) + b;
    } else {
        // elastic_out function
        if (t == 0) return b;
        if ((t /= d) == 1) return b + c;
        if (!p) p = d * .3;
        if (!a || a < Math.abs(c)) {
            a = c;
            var s = p / 4;
        } else var s = p / (2 * Math.PI) * Math.asin(c / a);
        return (a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b);
    }
}


function easeAndWizz() {
    var n = 0;
    if (numKeys > 0) {
        n = nearestKey(time).index;
        if (key(n).time > time) {
            n--
        }
    }

    try {
        var key1 = key(n);
        var key2 = key(n + 1);
    } catch (e) {
        return null;
    }

    // determine how many dimensions the keyframes need
    var dim = 1; // It's gotta have at least ONE dimension
    try {
        key(1)[1];
        dim = 2;
        key(1)[2];
        dim = 3;
    } catch (e) {}

    t = time - key1.time;
    d = key2.time - key1.time;

    sX = key1[0];
    eX = key2[0] - key1[0];

    if (dim >= 2) {
        sY = key1[1];
        eY = key2[1] - key1[1];

        if (dim >= 3) {
            sZ = key1[2];
            eZ = key2[2] - key1[2];
        }
    }

    if ((time < key1.time) || (time > key2.time)) {
        return value;
    } else {
        val1 = customFunc(t, sX, eX, d, a, p, s);
        switch (dim) {
            case 1:
                return val1;
                break;
            case 2:
                val2 = customFunc(t, sY, eY, d, a, p, s);
                return [val1, val2];
                break;
            case 3:
                val2 = customFunc(t, sY, eY, d, a, p, s);
                val3 = customFunc(t, sZ, eZ, d, a, p, s);
                return [val1, val2, val3];
                break;
            default:
                return null;
        }
    }
}

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