Réf:[vtkusers] Picking a pixel coordinate with vtkPointPicke
Hummel, Jerome
Jerome.Hummel at fr.michelin.com
Mon Nov 20 02:19:59 EST 2006
Hi Florent,
I think you forgot to associate your point picker with your render window
interactor (iren->SetPicker(picker)).
-Jerome
____________________Séparateur de messages____________________
Objet : [vtkusers] Picking a pixel coordinate with vtkPointPicker or
Auteur : Florent.Chandelier at USherbrooke.ca
Date : 17/11/2006 18:48
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Dear VTK users, <br>
<br>
I'm not new to VTK but I'm new to dealing with mouse events.<br>
I try to write a simple code loading a BMP and determining on a mouse
left click, the coordinate of the pixel picked.<br>
<br>
Whether I use vtkPointPicker or vtkWorldPointPicker I'm not able to
interact with the image and extract some coordiante with the following
code.<br>
<br>
Can someone point me out to where is my mistake (I did check the
vtkusers archives but did not find any answers).<br>
regards,<br>
<br>
Florent Chandelier<br>
<br>
Pasted below is my code:<br>
<br>
#include "vtkRenderer.h"<br>
#include "vtkRenderWindow.h"<br>
#include "vtkRenderWindowInteractor.h"<br>
#include "vtkBMPReader.h"<br>
#include "vtkPolyDataMapper.h"<br>
#include "vtkActor.h"<br>
#include "vtkActor2D.h"<br>
#include "vtkImageMapper.h"<br>
<br>
<br>
#include "vtkObject.h"<br>
#include "vtkWorldPointPicker.h"<br>
#include "vtkCoordinate.h"<br>
#include "vtkPointPicker.h"<br>
#include "vtkPropPicker.h"<br>
#include "vtkProp.h"<br>
<br>
int main( int argc, char *argv[] )<br>
{<br>
<br>
// Image Size<br>
int size_x = 374;<br>
int size_y = 328;<br>
<br>
// load and show image<br>
vtkBMPReader *m_singleImage = vtkBMPReader::New();<br>
m_singleImage->SetFileName("Img_Test.bmp");<br>
m_singleImage->SetDataExtent(0,size_x, 0, size_y, 0, 0);<br>
m_singleImage->SetDataSpacing(1, 1, 0);<br>
m_singleImage->Update();<br>
<br>
// map it!<br>
vtkImageMapper *mapIm = vtkImageMapper::New();<br>
mapIm->SetInput(m_singleImage->GetOutput());<br>
mapIm->SetColorLevel(128);<br>
mapIm->SetColorWindow(256);<br>
<br>
// hook it up to an actor<br>
vtkActor2D *actorIm = vtkActor2D::New();<br>
actorIm->SetMapper(mapIm);<br>
<br>
// render the actor<br>
vtkRenderer *renderer = vtkRenderer::New();<br>
renderer->SetViewport(0, 0, 1, 1);<br>
renderer->AddActor(actorIm);<br>
renderer->SetBackground(1.0, 1.0, 1.0);<br>
<br>
vtkRenderWindow *renWin = vtkRenderWindow::New();<br>
renWin->AddRenderer(renderer);<br>
renWin->SetSize(size_x,size_y);<br>
<br>
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();<br>
iren->SetRenderWindow(renWin); <br>
<br>
renWin->Render();<br>
iren->Start();<br>
<br>
int x, y;<br>
<br>
vtkPointPicker *picker = vtkPointPicker::New();<br>
int X,Y;<br>
int result = picker->Pick((float)X,(float)Y,0.0,renderer);<br>
float *pos; float Point[3]; <br>
if (result != -1)<br>
{<br>
/*pos = picker->GetPickPosition();<br>
for(int i=0;i<3;i++)<br>
Point[i] = pos[i]; */<br>
<br>
printf("pick, pick\n"); <br>
}<br>
<br>
/*vtkWorldPointPicker * picker = vtkWorldPointPicker::New();<br>
int picked = picker->Pick(x, y, 0, renderer);<br>
if (picked != -1)<br>
{<br>
std::cout << picker->GetPickPosition()[0] << ":
" <<<br>
picker->GetPickPosition()[1] << std::endl; <br>
vtkCoordinate* c = vtkCoordinate::New();<br>
c->SetViewport(renderer);<br>
c->SetCoordinateSystemToWorld();<br>
c->SetValue(picker->GetPickPosition()[0],<br>
picker->GetPickPosition()[1]);<br>
int *p = c->GetComputedDisplayValue(renderer);<br>
std::cout << p[0] << ": " << p[1] <<
std::endl;<br>
<br>
}*/<br>
<br>
return 0;<br>
<br>
}<br>
<br>
<br>
<br>
<br>
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<p class="p1"><b><i>Florent Chandelier</i></b><span class="s1">, PhD
candidate</span></p>
<p class="p2"><span class="s1">Master's in Medical Imaging</span>
(Medicine Faculty, Paris, France),<span class="Apple-converted-space"> </span></p>
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<p class="p4">2500, boul. Université</p>
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begin:vcard
fn:Florent Chandelier
n:Chandelier;Florent
org;quoted-printable:Universit=C3=A9 de Sherbrooke;Bio-Engineering
adr;quoted-printable:;;1580 rue Prunier;Sherbrooke;Qu=C3=A9bec;J1K2K3;Canada
email;internet:Florent.Chandelier at free.fr
title:PhD Student - Master's in Engineering - Master's in Medical Imaging
tel;work:001 819 821 8000 ext:63160
tel;home:001 819 348 2209
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