smoothDamp Function Implementation!!!

[scc172fly]

static smoothDamp(current: number, target: number, currentVelocity: number, smoothTime: number, maxSpeed?: number, deltaTime?: number): number[] {
deltaTime = deltaTime ? deltaTime : Laya.timer.delta * 0.001;
maxSpeed = maxSpeed ? maxSpeed : Number.MAX_VALUE;
smoothTime = Math.max(0.0001, smoothTime);
let num = 2 / smoothTime;
let num2 = num * deltaTime;
let num3 = 1 / (1 + num2 + 0.48 * num2 * num2 + 0.235 * num2 * num2 * num2);
let num4 = current - target;
let num5 = target;
let max = maxSpeed * smoothTime;
num4 = this.clamp(num4, -max, max);
target = current - num4;
let num7 = (currentVelocity + (num * num4)) * deltaTime;
currentVelocity = (currentVelocity - num * num7) * num3;
let num8 = target + (num4 + num7) * num3;

    if ((num5 > current) == (num8 > num5)) {
        num8 = num5;
        currentVelocity = (num8 - num5) / deltaTime;
    }

    return [num8, currentVelocity];
}

return [current, currentVelocity]

It has been tested and perfect！