methods = dobj_methods;
treeroot = treetrunk.getTreeRoot();
depth_max = treeroot.getTreeNodeID().depth;
nesting_stacks = new NestingStacks( tree_view );
map_line2row = null;
drawn_boxes = new DrawnBoxSet( tree_view );
// timeframe4imgs to be initialized later in initializeAllOffImages()
timeframe4imgs = null;
depth_init = (short) ( depth_max
- Parameters.INIT_SLOG2_LEVEL_READ + 1 );