custom Shake implementation for Phaser 2 (transpiled from Shake.ts)

Shake.js

"use strict";
var Shake = (function () {
    function Shake(game) {
        this.game = game;
    }
    
    /**
     * @param {number} amp amplitude in pixels
     * @param {number} duration
     * @param {boolean} x shake on X axis
     * @param {boolean} y shake on Y axis. If x is false and y is omitted, shake on Y axis only.
     */
    Shake.prototype.shake = function (amp, duration, x, y) {
        this.reset();
        this.x = x;
        this.y = !x && y === undefined ? true : y;
        this.amp = amp;
        this.tween = this.game.add.tween(this);
        this.tween.to({ amp: 0 }, duration, Phaser.Easing.Linear.None, true);
    };
    
    /** Internal */
    Shake.prototype.reset = function () {
        this.restore();
        this.xoff = 0;
        this.yoff = 0;
        this.amp = 0;
        if (this.tween) {
            this.tween.stop();
        }
    };
    
    /** Internal */
    Shake.prototype.restore = function () {
        if (this.x)
            this.game.camera.x -= this.xoff;
        if (this.y)
            this.game.camera.y -= this.yoff;
    };
    
    /** Call this in your state update function */
    Shake.prototype.update = function () {
        if (!this.amp) {
            return;
        }
        this.restore();
        if (this.x) {
            this.xoff = Math.round(this.game.rnd.realInRange(-this.amp, this.amp));
            this.game.camera.x += this.xoff;
        }
        if (this.y) {
            this.yoff = Math.round(this.game.rnd.realInRange(-this.amp, this.amp));
            this.game.camera.y += this.yoff;
        }
    };
    
    return Shake;
}());