code: function calculateFontSpace(text, formObject, fontSize) {
      var font = scope.internal.getFont(formObject.fontName, formObject.fontStyle);
      var width = scope.getStringUnitWidth(text, {
        font: font,
        fontSize: parseFloat(fontSize),
        charSpace: 0
      }) * parseFloat(fontSize);
      var height = scope.getStringUnitWidth("3", {
        font: font,
        fontSize: parseFloat(fontSize),
        charSpace: 0
      }) * parseFloat(fontSize) * 1.5;
      return {
        height: height,
        width: width
      };
    }
docs: Small workaround for calculating the TextMetric approximately.
  
  @param text
  @param fontsize
  @returns {TextMetrics} (Has Height and Width)