public void parse(Parser context, Element xmlElement) {
   int height = Integer.parseInt(getValue(xmlElement));
   if (sourceImage == null) throw ResourceException.syntaxException();
   tileRows = sourceImage.getHeight() / height;
   tileIndex = 0;
   updateTiles();
 }
 public void parse(Parser context, Element xmlElement) {
   int width = Integer.parseInt(getValue(xmlElement));
   if (sourceImage == null) throw ResourceException.syntaxException();
   tileCols = sourceImage.getWidth() / width;
   tileIndex = 0;
   updateTiles();
 }