Several updates to the Markups module and the addition of a Markups toolbar were added in commit: ENH: Improve control point state management and add markups toolbar · Slicer/Slicer@09d12ae · GitHub and are available in the latest preview version.
The motivation for these changes was to add support for unplaced or missing control points. These states make it possible to create landmark templates for efficient placing of pre-named points, which is a common feature in other landmarking software. The position status can now be accessed and changed in the control points table of the Markups menu. Additionally, the number of control points in any markup node can now be locked, preventing the addition of new points and the deletion of named points.
While making these updates, we found that the current system of adding new points via the mouse mode menu made it difficult to tell which markup was being edited. To resolve this, a Markups toolbar was added to display/select the active markup node and provide access to several node properties without opening the Markups module.
In the Markups toolbar, the “Create new node and initiate placement” and the “Continue placement” functions have been explicitly separated, to prevent confusion about whether a new node would be created on entering placement mode. The “Place” button in the mouse mode toolbar is now replaced with a button that toggles the Markups toolbar (where new nodes can be created), when there are no active nodes that can accept more points in the scene.
Placement of annotation nodes is not included in the Markups toolbar. Previously, the placement of markups or annotation type nodes was not well distinguished, which was especially problematic as the Annotation nodes are a legacy type that are planned to be phased out. Creation of Annotation type nodes has been moved to the Annotation module to avoid confusion and so they will only be placed intentionally. A shortcut to the Annotation module has been added to the Markups toolbar to prompt the user and reduce the number of clicks needed to place a node.
The issues and fixes related to these changes are being tracked here, so please update with any feedback.