flatCoordinateOperations.js

var FlatCoordinates = function () {

    var FlatCoordinates = function FlatCoordinates (coordinates) {
      this._coordinates = coordinates;
    };

    FlatCoordinates.prototype.shift = function () {
        var c = this._coordinates;
        c.shift();
        c.shift();
    };

    FlatCoordinates.prototype.pop = function () {
        var c = this._coordinates;
        c.pop();
        c.pop();
    };

    FlatCoordinates.prototype.push = function (coordinate) {
        var c = this._coordinates;
        c.push(coordinate[0]);
        c.push(coordinate[1]);
    };

    FlatCoordinates.prototype.get = function (index) {
        return this._coordinates.slice(index*2, (index*2)+2);
    };

    FlatCoordinates.prototype.set = function (index, coordinate) {
        this._coordinates.splice(index, index+2, coordinate[0], coordinate[1]);
    };

    FlatCoordinates.prototype.unshift = function (coordinate) {
        var c = this._coordinates;
        c.unshift(coordinate[0]);
        c.unshift(coordinate[1]);
    };

    FlatCoordinates.prototype.length = function () {
        return this._coordinates.length / 2;
    };

    return FlatCoordinates;

}.call(null);