vector.js

(function ($) {
  var getSetZero = function (v) {
    return v !== undefined ? (this.array[0] = v) : this.array[0]
  },
    getSetOne = function (v) {
      return v !== undefined ? (this.array[1] = v) : this.array[1]
    };

  $.Vector = function (arr) {
    var array = $.isArray(arr) ? arr : $.makeArray(arguments);
    this.update(array);
  };
  $.Vector.prototype =

  {

    app: function (f) {
      var i, newArr = [];

      for (i = 0; i < this.array.length; i++) {
        newArr.push(f(this.array[i], i));
      }
      return new $.Vector(newArr);
    },

    plus: function () {
      var i, args = arguments[0] instanceof $.Vector ? arguments[0].array : $.makeArray(arguments),
        arr = this.array.slice(0),
        vec = new $.Vector();
      for (i = 0; i < args.length; i++) {
        arr[i] = (arr[i] ? arr[i] : 0) + args[i];
      }
      return vec.update(arr);
    },

    minus: function () {
      var i, args = arguments[0] instanceof $.Vector ? arguments[0].array : $.makeArray(arguments),
        arr = this.array.slice(0),
        vec = new $.Vector();
      for (i = 0; i < args.length; i++) {
        arr[i] = (arr[i] ? arr[i] : 0) - args[i];
      }
      return vec.update(arr);
    },

    equals: function () {
      var i, args = arguments[0] instanceof $.Vector ? arguments[0].array : $.makeArray(arguments),
        arr = this.array.slice(0),
        vec = new $.Vector();
      for (i = 0; i < args.length; i++) {
        if (arr[i] != args[i]) {
          return null;
        }
      }
      return vec.update(arr);
    },

    x: getSetZero,

    left: getSetZero,

    width: getSetZero,

    y: getSetOne,

    top: getSetOne,

    height: getSetOne,

    toString: function () {
      return "(" + this.array.join(', ') + ")";
    },

    update: function (array) {
      var i;
      if (this.array) {
        for (i = 0; i < this.array.length; i++) {
          delete this.array[i];
        }
      }
      this.array = array;
      for (i = 0; i < array.length; i++) {
        this[i] = this.array[i];
      }
      return this;
    }
  };

  $.Event.prototype.vector = function () {

    var touches = "ontouchend" in document && this.originalEvent.touches && this.originalEvent.touches.length ? this.originalEvent.changedTouches[0] : this;
    if (this.originalEvent.synthetic) {
      var doc = document.documentElement,
        body = document.body;
      return new $.Vector(touches.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc.clientLeft || 0), touches.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc.clientTop || 0));
    } else {
      return new $.Vector(touches.pageX, touches.pageY);
    }
  };

  $.fn.offsetv = function () {
    if (this[0] == window) {
      return new $.Vector(window.pageXOffset ? window.pageXOffset : document.documentElement.scrollLeft, window.pageYOffset ? window.pageYOffset : document.documentElement.scrollTop);
    } else {
      var offset = this.offset();
      return new $.Vector(offset.left, offset.top);
    }
  };

  $.fn.dimensionsv = function (which) {
    if (this[0] == window || !which) {
      return new $.Vector(this.width(), this.height());
    }
    else {
      return new $.Vector(this[which + "Width"](), this[which + "Height"]());
    }
  };

  return $;
})(jQuery);