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<font size="-1"><font face="Verdana">I think i spoke too soon, I
thought vtkSmartPointer was some sort of map. Could you please give me
a brief explanation if what I am supposed to do. <br>
<br>
Are you saying I should store the IDs and the smart pointers in the
map, then I can delete the Image Actors?<br>
<br>
- John<br>
</font></font><br>
John Eke wrote:
<blockquote cite="mid:49B170D7.8050505@annidis.com" type="cite">
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
<font size="-1"><font face="Verdana">Thanks! I'll try that</font></font><br>
<br>
Mathieu Coursolle wrote:
<blockquote
cite="mid:A5F15970-4FC4-40EA-BBC2-3BD1A8947D9B@rogue-research.com"
type="cite">
<div>Have you tried using vtkSmartPointer ? The map will keep a
reference</div>
<div>to it. You just need to remove it from the map to release the
reference.</div>
<div><br>
</div>
<div>Mathieu</div>
<br>
<div>
<div>On 6-Mar-09, at 1:42 PM, John Eke wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff" text="#000000"> <font size="-1"><font
face="Verdana">Hi,<br>
<br>
Another problem comes up. Here's a code snippet:<br>
<br>
char images[20];<br>
//initialize array<br>
for (int i = 0; i < 20; i++)<br>
{<br>
if (image exists)<br>
{<br>
vtkPNGReader *pngReader = vtkPNGReader::New();<br>
vtkImageShiftScale *pShiftScaleFilter =
vtkImageShiftScale::New();<br>
pngReader->SetFileName(</font></font><font size="-1"><font
face="Verdana">images[i]</font></font><font size="-1"><font
face="Verdana">);<br>
pngReader->Update();<br>
<br>
//Image actor will only display 24bit RGBs<br>
//image shift scale filter will convert any image to this
version<br>
pShiftScaleFilter->SetInputConnection(pngReader->GetOutputPort());<br>
pShiftScaleFilter->Update();<br>
pShiftScaleFilter->SetOutputScalarTypeToUnsignedChar();<br>
<br>
vtkImageActor *pImageActor = vtkImageActor::New();<br>
m_KeyMap.insert (images[i], pImageActor);//insert image
file name as its ID in a map, along with a pointer to the image actor<br>
pImageActor->SetInput(pShiftScaleFilter->GetOutput());<br>
<br>
m_pRenderer->AddActor(pImageActor);<br>
<br>
//pImageActor->Delete(); //cannot delete since I am
keeping a reference to it using an external map<br>
pShiftScaleFilter->Delete();<br>
pngReader->Delete();<br>
}<br>
}<br>
<br>
The problem is all 20 pShiftScaleFilter, and pngReader objects that are
created inside the loop probably do not get deleted since pImageActor
never gets deleted. So I get memory leaks<br>
<br>
Is there a better solution? Am I doing something wrong?<br>
<br>
- John<br>
</font></font><br>
John Eke wrote:
<blockquote cite="mid:49B14F30.4050300@annidis.com" type="cite"> <font
size="-1"><font face="Verdana">Thanks a lot, I will try that</font></font><br>
<br>
Mathieu Coursolle wrote:
<blockquote
cite="mid:5245297C-5D18-4137-88D2-E3C332214A7F@rogue-research.com"
type="cite">
<div>Hi,</div>
<div><br>
</div>
<div>If I understand correctly, you are trying to easily
retrieve a vtkActor instance based on some key.</div>
<div>I usually use a map where the key is a unique ID, and
the
value the actual vtkActor. </div>
<div>That way I can retrieve quickly the actor associated
with
a key. However, this has the inconvenient</div>
<div>of maintaining that map to make sure you remove actors
which are deleted, and add newly created</div>
<div>actors. </div>
<div><br>
</div>
<div>Hope this helps,</div>
<div><br>
</div>
<div>Mathieu</div>
<div><br>
</div>
<div>
<div>____________________ <br>
Mathieu Coursolle, M.Ing.<span class="Apple-tab-span"
style="white-space: pre;"> </span><br>
Rogue Research Inc. </div>
<div><a moz-do-not-send="true"
href="http://www.rogue-research.com/">www.rogue-research.com</a></div>
</div>
<br>
<div>
<div>On 6-Mar-09, at 11:02 AM, John Eke wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff" text="#000000"> <font size="-1"><font
face="Verdana">What I am trying to do is add a string Id as a private
member to a vtkImageActor. I have a scenario where I am inserting
multiple vtkImageActors into a renderer... and I want to selectively
enable and disable them. The only way I can forsee doing that is if
each image actor had an ID. That way I can iterate through the actors,
find the one with the ID I am looking for, then enable it.<br>
<br>
Is there a better way to do this? If not how can I add the ID field to
an image actor?<br>
<br>
I hope this clears things up<br>
<br>
- John<br>
</font></font><br>
Mathieu Malaterre wrote:
<blockquote
cite="mid:bf0c3b3f0903060747wb1720dfv8e34df7ca4e93d11@mail.gmail.com"
type="cite">
<pre wrap="">On Fri, Mar 6, 2009 at 4:39 PM, John Eke <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:johne@annidis.com"><johne@annidis.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Guys,
Whats the easiest way to get a vtkImageActor with an ID field? I tried
inheritance, didn't work (maybe I didn't do it right). I tried creating a
replica of vtkImageActor, and renaming it to something else. But with this,
the New() method returns NULL
</pre>
</blockquote>
<pre wrap=""><!---->I did not quite followed what you are trying to do, but you understand
that vtkImageActor::New() returns a vtkOpenGLImageActor ?
2cts
</pre>
</blockquote>
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Rogue Research Inc. </div>
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