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<div class="moz-cite-prefix">I agree, the loop should work now. But
then the error seems to be in Seed(). Is it possible, that the
order of points provided by the user is different from the order
in your vtkPoints object? Did you consider the image spacing?<br>
<br>
On 09.08.2012 18:52, Concetta Piazzese wrote:<br>
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You're right but the problem isn't fixed. I still got wrong
distances. The loop was wrong but I think the problem is not in
the loop. Now the loop is:<br>
for (int i=0; i<num; i++)<br>
{ <br>
points->GetPoint(i,punto);<br>
points->GetPoint(i+1,punto2);<br>
<br>
double squaredDistance;<br>
double dist;<br>
<br>
// Distance<br>
squaredDistance = vtkMath::Distance2BetweenPoints(punto,
punto2);<br>
dist=sqrt(squaredDistance);<br>
<br>
std::cout << "Distance " << dist <<
std::endl;<br>
<br>
}<br>
<br>
<div>
<hr id="stopSpelling">Date: Thu, 9 Aug 2012 18:47:08 +0200<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:dominique@toepfer-web.de">dominique@toepfer-web.de</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:aliens30586@hotmail.it">aliens30586@hotmail.it</a><br>
CC: <a class="moz-txt-link-abbreviated" href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><br>
Subject: Re: [vtkusers] Distance between 2 points in
millimeters (mm)<br>
<br>
<div class="ecxmoz-cite-prefix">Hi,<br>
<br>
I think these lines in the for-loop are wrong:<br>
<br>
points->GetPoint(num-1,punto);<br>
points->GetPoint(num,punto2);<br>
<br>
You seem to calculate the distance between the same two
points in every iteration. You need to use i instead of num
here.<br>
<br>
Regards,<br>
Dominique<br>
<br>
<br>
On 09.08.2012 18:34, Concetta Piazzese wrote:<br>
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<div dir="ltr"> Hy everyone. I hope somebody can help me!<br>
I need to find the distance between 2 points in
millimeters like the vtkDistanceWidget does. An user
places 10 points and then the program compute the
distances. The problem is that I have an array of
vtkPoints and I can't use vtkDistanceWidget to find the
distances. How I can find the distance? The points
positions are inglobal coordinate values. The distance I
got are totally wrong. Here is my code: <br>
<br>
int main(int argc, char *argv[])<br>
{<br>
reader->SetFileName("C:/Tesi/DistanceBetween2Points_build/Debug/Data/Plaque_08.mhd");<br>
reader->Update(); <br>
<br>
imgconn=reader->GetOutput();<br>
<br>
//Points Placement with vtkSeedWidget. Poins are
stored in a vtkPoints called "points"<br>
Seed();<br>
<br>
double punto[3];<br>
double punto2[3];<br>
<br>
int num=points->GetNumberOfPoints();<br>
<br>
for (int i=0; i<num; i++)<br>
{ <br>
points->GetPoint(num-1,punto);<br>
points->GetPoint(num,punto2);<br>
<br>
double squaredDistance;<br>
double dist;<br>
<br>
// Distance<br>
squaredDistance =
vtkMath::Distance2BetweenPoints(punto, punto2);<br>
dist=sqrt(squaredDistance);<br>
<br>
std::cout << "Distance " << dist <<
std::endl;<br>
<br>
}<br>
<br>
return EXIT_SUCCESS;<br>
}<br>
<br>
What's the problem? vtkDistanceWidget computes distances
using vtkMath::Distance2BetweenPoints. So what am I doing
wrong?<br>
Thank you!<br>
</div>
<br>
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<br>
<pre class="ecxmoz-signature">--
Dominique Töpfer, Dipl.-Inform.
Institute of Medical Physics
University of Erlangen</pre>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Dominique Töpfer, Dipl.-Inform.
Institute of Medical Physics
University of Erlangen</pre>
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