[vtkusers] Draw line with vtk

[Sankhesh Jhaveri]

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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