text: function Dimension(w, h) {
      this.w = w ? w : 0;
      this.h = h ? h : 0;
  }
  Dimension.REG_EX = /^([0-9\.\-]+)\,([0-9\.\-]+)$/;
  Dimension.fromString = function(literal) {
      var dim = new Dimension();
      if (literal.match(Dimension.REG_EX)) {
          dim.w = parseFloat(RegExp.$1);
          dim.h = parseFloat(RegExp.$2);
      }
  
      return dim;
  };
  
  Dimension.prototype.toString = function () {
      return this.w + "," + this.h;
  };
  Dimension.prototype.narrowed = function (delta, delta2) {
      var dim = new Dimension(this.w - delta, this.h - (typeof(delta2) == "undefined" ? delta : delta2));
      return dim;
  };
  
  pencilSandbox.Dimension = {
      newDimension: function (w, h) {
          return new Dimension(w, h);
      }
  };
  for (var p in Dimension) {
      pencilSandbox.Dimension[p] = Dimension[p];
  };
  