[vtkusers] Draw line with vtk

[K O ranjith]

Hi,

I'm using vtkImageViewer2 for rendering both image and line and custom
vtkInteractorStyleImage
for event handling. In this case how o set the set the display position Z
coordinate to 0. Actually I don’t know in which vtk object need to set
display position Z coordinate. In renderer or in vtkLineRepresentation?


Thanks



On Wed, Sep 20, 2017 at 6:21 PM, Sankhesh Jhaveri <
sankhesh.jhaveri at kitware.com> wrote:

> 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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