[vtk-developers] 3D widget changes

[dean.inglis at on.aibn.com]

Hi,

this is welcome news Will.  I have a spline
widget with sphere handles where this would be most
helpful.  As noted, vtkImagePlaneWidget doesn't have handles per se: the margins are set at a fixed %ge of the size of the plane (5%).  In a multi-
widget app, it may be useful to revert to size
based on the renderer's diagonal...also, currently
margins scale in size as the plane is scaled
(ctrl+middle button or shift+middle button).  If
anyone would like to see an absolute(?) fixed(?)
margin size option I could work it out.

Dean

> 
> From: Will Schroeder <will.schroeder at kitware.com>
> Date: 2002/09/05 Thu PM 12:21:59 EST
> To: vtk-developers at public.kitware.com
> Subject: [vtk-developers] 3D widget changes
> 
> Hi Folks-
> 
> For those working with 3D widgets I've added some features to control the 
> size of the handles and other 3D objects that you grab and manipulate. The 
> idea is to allow the user to be able to manipulate the widget no matter how 
> much the camera is zoomed, and how small the widget becomes.
> 
> There is a HandleSize ivar in the vtk3DWidget class. This is the fraction 
> of the size of the diagonal of the renderer. There is also a convenience 
> method SizeHandles(float) that returns a representative size given the 
> HandleSize ivar and the factor (normally 1.0) that is passed into the 
> method. I've also create a virtual, empty SizeHandles() method that 
> subclasses can implement. This is generally called in the SetEnabled() 
> widget method, and when the interaction ends (e.g., mouse button goes up). 
> Note: some widgets (like Dean's ImagePlaneWidget and the PointWidget) have 
> no handles to speak of, so this functionality does not apply.
> 
> I'm still experimenting a bit, so feedback is welcome. I've converted the 
> line widget, plane widget, implicit plane widget, and box widget to use 
> this functionality.
> 
> Will
> 
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