[Insight-users] Draw a line on the window

[Luis Ibanez]

Hi Erkang,

The LiverTumorSegmentation application uses VTK.

Therefore, you may want to use the class:

http://www.vtk.org/doc/nightly/html/classvtkLineWidget.html

Note that you can force the line to
be aligned with a plane by using the
methods

    void SetAlignToXAxis<http://www.vtk.org/doc/nightly/html/classvtkLineWidget.html#aaa561f1a3cc726fdc7441a485959570a>()
    void SetAlignToYAxis<http://www.vtk.org/doc/nightly/html/classvtkLineWidget.html#a669f7f3a4c912311b03d4c61b93d5469>()
    void SetAlignToZAxis<http://www.vtk.org/doc/nightly/html/classvtkLineWidget.html#a73ed44c5ba19db4c1ee99c8f259c63bd>()



   Regards,


         Luis



---------------------------------------------------
On Thu, Apr 15, 2010 at 10:20 AM, Erkang Cheng <ekyaya at gmail.com> wrote:

> Hi all:
>
> Could anyone help me? I follow the example in InsightApplication titled
> "LiverTumorSegmentation". I want to draw a line one the window.
>
> The story is that, I want to interact the window which display a image or
> one slice of 3D data (like DICOM).
>
> The operation is that when I click one point, and mouse move on the window,
> then LeftButtonUp. These action could related to a line.
>
> I want to save the positions of all the points on the line and draw this
> line on the window.
>
> I follow the example in InsightApplication titled "LiverTumorSegmentation".
> In this application, I can get the point when I click on the window, also, I
> can get the points when mouse move.
>
> So, I want to draw this line on the window. How to do this?
>
> My idea is that, suppose that there are two points p1 and p2, p1 is the
> point I click on the window, when mouse move, p2 is current point, I want to
> draw a line from p1 to p2. Then update p1 as p2. This could turn into a
> line. I use this method in MFC which can draw a line.
>
> But, I don't know how to draw a line in a vtkRenderWindow? what's the
> coordinate of the vtkRenderWindow?
>
> Is there is example similar to my question?
>
> Thanks a lot.
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