[vtkusers] vtkCanvas and "Visualization Toolkit" window

[Sebastien Jourdain]

That Render() call should not be made before the canvas is connected into a
Swing parent component. That component can be non visible, but if it is
just by itself, this is normal to see the behavior that you noticed.

Seb


On Fri, May 10, 2013 at 5:08 AM, Marco Sambin <m.sambin at gmail.com> wrote:

> Hi Seb,
>
> thanks for your reply.
> The short answer is: yes, I am building and adding my vtkCanvas to my
> application GUI in the EDT.
>
> Let me explain a bit more how my application is working: this is a
> Swing-based Java application, managing medical images. When I press a
> button on the GUI of this application, the VTK-based reslicing feature
> (based on vtkImagePlaneWidget's functionality) is invoked.
>
> In particular, the three vtkImagePlaneWidgets are initialized, are
> connected with a Reader loading the volume (which was initialized in a
> separate thread), and they are placed in the vtkCanvas. This vtkCanvas is
> then added to a JPanel inside my application's GUI.
>
> Debugging my application, I have noticed that the separate "Visualization
> Toolkit" window appears upon calling the Render() method on my vtkCanvas in
> a moment when the vtkCanvas hasn't been added to the parent JPanel yet.
>
> Shall I absolutely avoid calling Render() on a vtkCanvas which is not
> visible yet?
>
> Thanks and best regards,
>
> Marco
>
>
> On Thu, May 9, 2013 at 6:58 PM, Sebastien Jourdain <
> sebastien.jourdain at kitware.com> wrote:
>
>> How do you do the vtkCanvas binding within your frame ?
>> Does that piece of code get executed inside the EDT ?
>>
>> Since you are using vtk 6, you should probably use the new rendering
>> class for Java which should give you more freedom. To learn more about
>> them, you can look at our sample applications inside the Wrapping/Java
>> directory within the source tree.
>>
>> Seb
>>
>>
>> On Thu, May 9, 2013 at 12:44 PM, Marco Sambin <m.sambin at gmail.com> wrote:
>>
>>> Hi all.
>>>
>>> In my Java application, I am using a vtkCanvas where three
>>> vtkImagePlaneWidgets are displayed, each one cutting a specific section of
>>> my volume (deriving from a medical data set).
>>>
>>> At application startup, when the GUI of my Java application is built, I
>>> see for a few moments a pop-up window titled "Visualization Toolkit",
>>> containing my three vtkImagePlaneWidgets. After a second or so,  this
>>> window disappears, and its content is then displayed inside my vtkCanvas,
>>> embedded in the GUI of my application, as expected.
>>>
>>> Is the appearance of this window normal? Is there a way to prevent that
>>> separate "Visualization Toolkit" window from appearing, and have the
>>> content displayed directly inside my vtkCanvas?
>>>
>>> I am running VTK 6.0 (from GIT) and Java 7 64-bit on a Windows 7 64-bit
>>> PC.
>>>
>>> Thanks in advance for all your comments.
>>> Best regards,
>>>
>>> Marco
>>>
>>>
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>>
>
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