[vtkusers] location of movable component

Podariu, Silviu spodariu at unmc.edu
Wed Dec 25 13:40:01 EST 2013

I managed, with help from a few other sources, to get that idea written into python. It's exactly what i need, thanks again!

Here is a piece of python code in which you can move an object within the renderer and get/write its position ( this helps me because i can move to the point whose coordinates i am wondering about, thereby figuring its location ). I don't know if this helps you, but you were asking about it...

import vtk

def main():

    # -- Jorge Perez's advice, following right after std setup block below,
    # combined with insights about the main tool, vtkFixedSizeHandleRepresentation3D, from
    # http://vtk.org/gitweb?p=VTK.git;a=blob;f=Interaction/Widgets/Testing/Cxx/TestFixedSizeHandleRepresentation3D.Cxx

    # -- std setup part --
    # -- add here whatever objects you like to this renderer,
    #    or proceed with an empty scenery and place only the
    #    movable handle.

    title="whatever title here"

    renWind.SetWindowName( title )
    renWind.AddRenderer( ren )
    renWind.SetSize( windowSize[0], windowSize[1] )

    iren.SetRenderWindow( renWind )

    iren.SetInteractorStyle( style )
    # -- end std things, before display --

    # -----------------------------------------------
    # -- main part, after all other components ( not
    #    included ) have been added to the renderer,
    #    we place the movable handle and define a
    #    call-back function object to report location
    # -----------------------------------------------
    rep.SetHandleSizeInPixels( 10 )
    rep.GetProperty().SetColor( (0.4,0,0) )
    rep.SetWorldPosition( (0,0,0) )

    widget.SetInteractor( renWind.GetInteractor() )
    widget.SetDefaultRenderer( ren )
    widget.SetRepresentation( rep )

    # -- here we need the callback function object, like 'mcbk' at line
    #    628-631 in the C++ example ( see Execute() defined at lines
    #    566-577, which needs to know about rep. )
    #    A simple python class to serve this purpose is used below
    hcb=HandleCallback( rep )
    widget.AddObserver( 'InteractionEvent', hcb)

    # -- start the show --


class HandleCallback():
    def __init__(self, rep):
        print "HandleCallback obj built"
    def __call__(self, obj, ev):
        print "left at: ( %7.2f , %7.2f, %7.2f )" % ( loc )


From: vtkusers-bounces at vtk.org [vtkusers-bounces at vtk.org] on behalf of Podariu, Silviu [spodariu at unmc.edu]
Sent: Thursday, December 19, 2013 8:07 PM
To: Jorge Perez
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] location of movable component

Thank you Jorge,

I have been trying to convert the Tcl to Python; still working on it...  :)


From: Jorge Perez [josp.jorge at gmail.com]
Sent: Monday, December 16, 2013 3:46 AM
To: Podariu, Silviu
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] location of movable component

Hi, you can use vtkHandleWidget


below is a simple example in Tcl, the position is printed in standard output.

package require vtk
package require vtkinteraction

# this proc will be invoked during widget interaction
proc OnInteraction { r } {
  set pos [$r GetWorldPosition]
  puts "pos = $pos"

vtkTkRenderWidget .tkrw
::vtk::bind_tk_render_widget .tkrw

set renWin [.tkrw GetRenderWindow]

vtkRenderer ren
ren SetBackground 0.0 0.4 0.5

$renWin AddRenderer ren

# create the widget representation
vtkFixedSizeHandleRepresentation3D rep
rep SetHandleSizeInPixels 10
[rep GetProperty] SetColor 1 0 0
rep SetWorldPosition 0 0 0

# create the widget
vtkHandleWidget widget
widget SetInteractor [$renWin GetInteractor]
widget SetDefaultRenderer ren
widget SetRepresentation rep
# add the interaction observer
widget AddObserver InteractionEvent {OnInteraction rep}
after idle {widget On}

pack .tkrw -fill both -expand yes

2013/12/13 Podariu, Silviu <spodariu at unmc.edu<mailto:spodariu at unmc.edu>>


Is there a way of adding a little component in space ( point, sphere, cube ), which can be moved interactively ( with the mouse/arrows/keys ) and whose location at any time can be displayed in the terminal ( or on the renderer window itself )?


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