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