@irysius/grid-math/Gravity.js

Tools to assist with grid math and algorithms

(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    var Gravity;
    (function (Gravity) {
        Gravity[Gravity["Center"] = 0] = "Center";
        Gravity[Gravity["North"] = 1] = "North";
        Gravity[Gravity["South"] = 2] = "South";
        Gravity[Gravity["East"] = 4] = "East";
        Gravity[Gravity["West"] = 8] = "West";
        Gravity[Gravity["NorthEast"] = 5] = "NorthEast";
        Gravity[Gravity["NorthWest"] = 9] = "NorthWest";
        Gravity[Gravity["SouthEast"] = 6] = "SouthEast";
        Gravity[Gravity["SouthWest"] = 10] = "SouthWest";
    })(Gravity = exports.Gravity || (exports.Gravity = {}));
    function hasGravity(value, targetGravity) {
        if (targetGravity === Gravity.Center) {
            return value === Gravity.Center;
        }
        else {
            return (value & targetGravity) === targetGravity;
        }
    }
    exports.hasGravity = hasGravity;
    function gravityToString(value) {
        let strings = [
            hasGravity(value, Gravity.North) ? 'North' : null,
            hasGravity(value, Gravity.South) ? 'South' : null,
            hasGravity(value, Gravity.East) ? 'East' : null,
            hasGravity(value, Gravity.West) ? 'West' : null
        ].filter(x => x);
        if (strings.length === 0) {
            return 'Gravity.Center';
        }
        else {
            return `Gravity.${strings.join('')}`;
        }
    }
    exports.gravityToString = gravityToString;
    function northOrSouth(gravity) {
        let maskedGravity = 0b0011 & gravity;
        switch (maskedGravity) {
            case Gravity.North:
                return Gravity.North;
            case Gravity.South:
                return Gravity.South;
            case Gravity.Center:
                return Gravity.Center;
            default:
                throw new Error('Cannot be Gravity.North & Gravity.South at the same time.');
        }
    }
    exports.northOrSouth = northOrSouth;
    function eastOrWest(gravity) {
        let maskedGravity = 0b1100 & gravity;
        switch (maskedGravity) {
            case Gravity.East:
                return Gravity.East;
            case Gravity.West:
                return Gravity.West;
            case Gravity.Center:
                return Gravity.Center;
            default:
                throw new Error('Cannot be Gravity.East & Gravity.West at the same time.');
        }
    }
    exports.eastOrWest = eastOrWest;
    exports.default = Gravity;
});