[vtkusers] Draw line with vtk

[K O ranjith]

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
> ​
>
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