1 /**
  2  * Copyright (C) 2012 KO GmbH <aditya.bhatt@kogmbh.com>
  3  *
  4  * @licstart
  5  * This file is part of WebODF.
  6  *
  7  * WebODF is free software: you can redistribute it and/or modify it
  8  * under the terms of the GNU Affero General Public License (GNU AGPL)
  9  * as published by the Free Software Foundation, either version 3 of
 10  * the License, or (at your option) any later version.
 11  *
 12  * WebODF is distributed in the hope that it will be useful, but
 13  * WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU Affero General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU Affero General Public License
 18  * along with WebODF.  If not, see <http://www.gnu.org/licenses/>.
 19  * @licend
 20  *
 21  * @source: http://www.webodf.org/
 22  * @source: https://github.com/kogmbh/WebODF/
 23  */
 24 
 25 /*global core*/
 26 /*jslint plusplus: true, bitwise: true */
 27 
 28 /**
 29  * @constructor
 30  */
 31 core.CSSUnits = function CSSUnits() {
 32     "use strict";
 33 
 34     // Unit values relative to 1 inch
 35     var self = this,
 36         sizemap = {
 37             "in": 1,
 38             "cm": 2.54,
 39             "mm": 25.4,
 40             "pt": 72,
 41             "pc": 12,
 42             "px": 96
 43         };
 44 
 45     /**
 46      * Takes a number of an oldUnit and returns its value in newUnit
 47      * @param {!number} value
 48      * @param {!string} oldUnit
 49      * @param {!string} newUnit
 50      * @return {!number}
 51      */
 52     this.convert = function (value, oldUnit, newUnit) {
 53         return value * sizemap[newUnit] / sizemap[oldUnit];
 54     };
 55 
 56     /**
 57      * Takes a measure such as "2cm" and returns it's measurement in the new unit, e.g. 20
 58      * @param {!string} measure
 59      * @param {!string} newUnit
 60      * @return {!number|undefined}
 61      */
 62     this.convertMeasure = function (measure, newUnit) {
 63         var value, oldUnit, newMeasure;
 64         if (measure && newUnit) {
 65             value = parseFloat(measure);
 66             oldUnit = measure.replace(value.toString(), "");
 67 
 68             newMeasure = self.convert(value, oldUnit, newUnit);
 69         }
 70         return newMeasure;
 71     };
 72     /**
 73      * @param {!string} measure
 74      * @return {!string}
 75      */
 76     this.getUnits = function (measure) {
 77         return measure.substr(measure.length - 2, measure.length);
 78     };
 79 };
 80