Difference between revisions of "Documentation/Labs/VTKWidgets"

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=Motivation=
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Content of this page was merged into [[Documentation/Labs/Improving_Markups]]
 
 
This page has the following purposes:
 
* It documents the user and developer features we wish to support in Slicer's version of the VTK Widgets
 
* It documents the changes we would like to ultimately see implemented in the official VTK Widgets.
 
* It presents Slicer specific implementation acting as a "experimental ground" to better understand how VTK widgets could be updated.
 
 
 
=Features Missing in 4.4=
 
 
 
==For Users==
 
 
 
* Control L to make a new fiducial list
 
* Control I for persistent place toggle
 
* Control M to make a ruler between last two placed fiducials
 
* back tick and control/shift back tick to jump slices to fiducials
 
* delete or backspace (or 'd') to delete fiducial under mouse
 
* 'p' to place fiducial without  having to click in window to grab focus
 
* Right click context menu (allow all operations currently supported in the table widget in the Markups GUI)
 
* modifier key to move fiducials between slices in 2D
 
* scaling issues (2D widget is scaled down by 300x compared to 3D)
 
* restrict to surface (found issues with the point placer wrt how it would be used in Slicer)
 
* rubber band placement for rulers
 
 
 
==For Developers==
 
 
 
* A start/end and moving event with seed number
 
* A start/end and hover event
 
* near widget vs near handle events
 
* A 2D version of the oriented handle widget
 
* consistent widget interfaces for click to place as well as programatic placement (vs them being added with zero size and having to be manipulated)
 
* consistent distribution of settings from the widget to all handles (process events on/off, visibility, display properties).
 
* expanded WidgetState settings that can be queried and maybe set
 
 
 
=Design and Implementation=
 
 
 
For the fiducials, we are currently using a vtkSeedWidget in both 2D and 3D. With the oriented polygonal handle representation being the only option to show a glyph and text together, and it being a 3D widget, it introduces some quirks in the 2D viewers. The Markups displayable managers have already been split into 2D and 3D versions to deal with this.
 
 
 
Some approaches:
 
 
 
* subclass the seed widget and representation and handles and create Slicer specific implementations
 
** Cons:
 
***not easy to feed back into VTK
 
** Pros:
 
***full control
 
* modify the Slicer specific VTK github fork to implement the features we need in C++, then migrate them back via gerrit
 
** Cons:
 
*** Still constrained by the VTK implementation as a starting point
 
** Pros:
 
*** more freedom to experiment/customise
 
*** easy to feed back into VTK
 
* Port the Slicer3 Tcl implmentation of the 2D fiducials to Python for Slicer4
 
** Cons:
 
*** issues with the reloadability of the scripted displayable managers
 
*** not easy to feed back into VTK
 
** Pros:
 
*** full control
 
*** nominally easier as that version supported many of our missing use cases
 
 
 
=References=
 
 
 
* [http://slicer-devel.65872.n3.nabble.com/interactive-contour-editing-td4032633i20.html#a4033779 Interactive Contour Editing thread on slicer-dev (2015)]
 
* [http://www.na-mic.org/Wiki/index.php/Projects:ARRA:SlicerAM:vtkWidgets ARRA grant widget notes (2010)]
 
* [http://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/SlicerApplication/MouseandKeyboardShortcuts Mouse and Keyboard Shortcuts (nightly)]
 
* [http://viewvc.slicer.org/viewvc.cgi/Slicer3/trunk/Base/GUI/Tcl/ Slicer3 Tcl SWidget, SeedSWidget, FiducialsSWidget]
 

Latest revision as of 19:40, 4 March 2019

Home < Documentation < Labs < VTKWidgets

Content of this page was merged into Documentation/Labs/Improving_Markups