small addition

src/com/t_oster/liblasercut/platform/Util.java

@@ -2,17 +2,17 @@
  * This file is part of VisiCut.
  * Copyright (C) 2012 Thomas Oster <thomas.oster@rwth-aachen.de>
  * RWTH Aachen University - 52062 Aachen, Germany
- * 
+ *
  *     VisiCut is free software: you can redistribute it and/or modify
  *     it under the terms of the GNU Lesser General Public License as published by
  *     the Free Software Foundation, either version 3 of the License, or
  *     (at your option) any later version.
- * 
+ *
  *    VisiCut is distributed in the hope that it will be useful,
  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *     GNU Lesser General Public License for more details.
- * 
+ *
  *     You should have received a copy of the GNU Lesser General Public License
  *     along with VisiCut.  If not, see <http://www.gnu.org/licenses/>.
  **/
@@ -33,7 +33,12 @@ public class Util {
       //TODO: check
       return dpi / 25.4;
     }
-  
+
+    public static double dpmm2dpi(double dpmm)
+    {
+      return dpmm * 25.4;
+    }
+
     public static double inch2mm(double inch) {
         return inch * 25.4;
     }
@@ -55,7 +60,7 @@ public class Util {
      * This method is used to avoid null checks
      * @param a
      * @param b
-     * @return 
+     * @return
      */
     public static boolean differ(Object a, Object b) {
         if (a == null ^ b == null) {