[vtkusers] Draw line with vtk

[Sankhesh Jhaveri]

Hi,

The issue is that vtkLineRepresentation is a 3D representation; whereas
vtkDistanceWidget and vtkAngleWidget have 2D counterparts.
A workaround would be to add an observer to the InteractionEvent and
explicitly set the display position Z coordinate to 0.

Hope that helps.

Thanks,
Sankhesh
​

On Wed, Sep 20, 2017 at 12:18 AM K O ranjith <kor1581 at gmail.com> wrote:

> Hello,
> I used vtkLineWidget2 to draw the lines.
> I'm using a vtkImageViewer2 for displaying dicom images and the lines
> should be rendered over the images .
> But vtkLineWidget2  lines are rendering below the image displayed in the
> vtkImageViewer2.
> I need to render the lines over the displayed image, have any solution for
> this?, have any method to control the rendering order(like bottom to top)?
> I also using vtkAngleWidget and vtkDistanceWidget, but these are
> displaying above the image, only vtkLineWidget2 (and vtkLineWidget)  have
> the issue.
> please help....
> (attached screenshot of the viewer, line rendered is marked inside the red
> circle)
>
> On Mon, Sep 18, 2017 at 5:50 PM, Sankhesh Jhaveri <
> sankhesh.jhaveri at kitware.com> wrote:
>
>> Hi,
>>
>> vtkLineWidget2 follows the new widget <-> representation model of
>> widgets in VTK; where the representation determines how the widget is drawn
>> on screen and the widget is responsible for interactions with the
>> representation.
>>
>> Hope that helps.
>> Sankhesh
>> ​
>>
>> On Mon, Sep 18, 2017 at 6:36 AM K O ranjith <kor1581 at gmail.com> wrote:
>>
>>> Hello,
>>> Thanks very much for the help.
>>> What is the difference between vtk line widgets "vtkLineWidget" and
>>> "vtkLineWidget2 "?
>>> I have to draw the lines above a dicom image displayed in an
>>> vtkImageViewer2
>>>
>>>
>>>
>>> On Fri, Sep 15, 2017 at 6:15 PM, Sankhesh Jhaveri <
>>> sankhesh.jhaveri at kitware.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> You should use the widget if you think you would like to
>>>> *interactively* place/draw and edit the line. If your goal is to just
>>>> display a line given a set of parameters and update it without interaction,
>>>> a simple cell based approach should work. See
>>>> https://lorensen.github.io/VTKExamples/site/Cxx/GeometricObjects/LongLine/
>>>>
>>>> Hope that helps.
>>>> Sankhesh
>>>> ​
>>>>
>>>> On Fri, Sep 15, 2017 at 7:19 AM K O ranjith <kor1581 at gmail.com> wrote:
>>>>
>>>>> Hello,
>>>>> I need to draw a couple of lines in an image viewer (vtkImageViewer2)
>>>>> for MRI slice planning application. Also should have to perform few
>>>>> operations (move, roatate)on the lines with mouse interactions and need to
>>>>> retrieve line properties (new coordinates after movement, width etc).
>>>>> I have found examples with  two methods while searching
>>>>> with vtkLineWidget2 and with vtkLine
>>>>> which approach will be more suitable?
>>>>>  what is the difference?have any difficulties for manipulation
>>>>> operations  if use vtkLineWidget2?
>>>>> Please help
>>>>>
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>>>> --
>>>> Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
>>>> <http://www.kitware.com/> | (518) 881-4417
>>>> ​
>>>>
>>>
>>> --
>> Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
>> <http://www.kitware.com/> | (518) 881-4417
>> ​
>>
>
> --
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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