@irysius/grid-math/Vector2.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 });
    function checkType(a, b) {
        if (a.type == null || b.type == null) {
            // Should at least one of the Vector2s be null, default to the opinionated Vector2's type.
            return a.type || b.type;
        }
        else {
            if (a.type !== b.type) {
                throw new Error(`Tried to operate on two different types of Vector2: ${a.type} & ${b.type}`);
            }
            return a.type;
        }
    }
    function create(x, y, type) {
        let result = { x, y };
        if (type != null) {
            result.type = type;
        }
        return result;
    }
    exports.create = create;
    function zero(type) {
        let result = { x: 0, y: 0 };
        if (type != null) {
            result.type = type;
        }
        return result;
    }
    exports.zero = zero;
    function unit(type) {
        let result = { x: 1, y: 1 };
        if (type != null) {
            result.type = type;
        }
        return result;
    }
    exports.unit = unit;
    function isVector2(v, typeToCheck) {
        return !!(v &&
            typeof v.x === 'number' &&
            typeof v.y === 'number') &&
            (v.type == null || typeof v.type === 'string') &&
            (typeof typeToCheck !== 'string' || v.type === typeToCheck);
    }
    exports.isVector2 = isVector2;
    function add(a, b) {
        let type = checkType(a, b);
        let result = {
            x: a.x + b.x,
            y: a.y + b.y
        };
        if (type != null) {
            result.type = type;
        }
        return result;
    }
    exports.add = add;
    function subtract(a, b) {
        let type = checkType(a, b);
        let result = {
            x: a.x - b.x,
            y: a.y - b.y
        };
        if (type != null) {
            result.type = type;
        }
        return result;
    }
    exports.subtract = subtract;
    function multiply(v, k) {
        let type = v.type;
        let result = {
            x: v.x * k,
            y: v.y * k
        };
        if (type != null) {
            result.type = type;
        }
        return result;
    }
    exports.multiply = multiply;
    function negate(v) {
        return multiply(v, -1);
    }
    exports.negate = negate;
    function areEqual(a, b, ignoreType) {
        return (ignoreType || a.type === b.type) &&
            (a.x === b.x && a.y === b.y);
    }
    exports.areEqual = areEqual;
    function closeEnough(e) {
        return function areCloseEnough(a, b, ignoreType) {
            return (ignoreType || a.type === b.type) &&
                (Math.abs(a.x - b.x) < e &&
                    Math.abs(a.y - b.y) < e);
        };
    }
    exports.closeEnough = closeEnough;
    function clone(v) {
        return Object.assign({}, v);
    }
    exports.clone = clone;
});