[vtkusers] CRITICAL Memory leak with vtkInteractorStyleRubberBandZoom

[Denis Shamonin]

Hi Amy,

There is critical memory leak with vtkInteractorStyleRubberBandZoom.
Always happen very soon during playing with 
vtkInteractorStyleRubberBandZoom in combination Reset View.

To get it try this:
1) Run simple example (below) with vtkInteractorStyleRubberBandZoom
2) Start zoom and ResetView ("r" in vtkRenderWindowInteractor) in 
different combinations.

In my case less than 100 operation will give you memory leak.
One more, after around 50 such exercises, zooming will stop working at 
all (Zoom = Pan).

Result:
1) Very soon swap will be empty, computer will slow down.
I am not happy with it. :(

Example for testing:
===========================================================================
#include <vtkConeSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCamera.h>
#include <vtkActor.h>
#include <vtkRenderer.h>

#include "vtkInteractorStyleTrackballCamera.h"
#include "vtkInteractorStyleJoystickCamera.h"
#include "vtkInteractorStyleTerrain.h"
#include "vtkInteractorStyleRubberBandZoom.h"

#include <unistd.h>

void usage() {
  fprintf(stderr, "style: (testing for different interaction styles)\n\n");
  fprintf(stderr, "usage: style [-s style] [-h]\n\n");
  fprintf(stderr, "-s 1 : InteractorStyleTrackballCamera\n");
  fprintf(stderr, "-s 2 : InteractorStyleJoystickCamera\n");
  fprintf(stderr, "-s 3 : InteractorStyleTerrain\n");   
  fprintf(stderr, "-s 4 : InteractorStyleRubberBandZoom\n");
  fprintf(stderr, "-h   : this (help) message\n");
  fprintf(stderr, "\nusage examples:\n"
                  "   $style -s 1\n\n");
}

int main( int argc, char *argv[] )
{
  int StyleId = 0; // Style for testing
  extern char *optarg;
  extern int optind;
 
  char *options = "s:h";
  int o, err = 0;

  // If no arguments, just print help and exit
  if (argc == 1) { usage(); exit(0);}

  // Parse command line options
  while ((o = getopt(argc,argv,options)) != -1) {
    switch(o) {
     case 's':
     StyleId = atoi((const char*)optarg);     
     break;
     case 'h':
     usage();
     exit(0);
     default:
     usage();
     err = 1;
     }
  }

  vtkInteractorStyle *style = NULL;

  switch(StyleId)
    {
    case 1:
    style = vtkInteractorStyleTrackballCamera::New();
    break;
    case 2:
    style = vtkInteractorStyleJoystickCamera::New();
    break;
    case 3:
    style = vtkInteractorStyleTerrain::New();
    break;
    case 4:
    style = vtkInteractorStyleRubberBandZoom::New();
    break;
    default:
    usage();
    exit(0);   
    }
 
  // Main staff
  vtkRenderer *ren = vtkRenderer::New();
 
  vtkConeSource *cone = vtkConeSource::New();
  cone->SetHeight( 3.0 );
  cone->SetRadius( 1.0 );
  cone->SetResolution( 10 );
 
  vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
  coneMapper->SetInput( cone->GetOutput() );

  vtkActor *coneActor = vtkActor::New();
  coneActor->SetMapper( coneMapper );

  ren->AddActor( coneActor );
  ren->SetBackground( 0.5, 0.5, 0.5 );

  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer( ren );
  renWin->SetSize( 300, 300 );

  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  iren->SetInteractorStyle(style);

  iren->Initialize();
  iren->Start();
 
  cone->Delete();
  coneMapper->Delete();
  coneActor->Delete();
  ren->Delete();
  renWin->Delete();
  iren->Delete();

  return 0;
}
===========================================================================

-- 
Denis Shamonin
Section Computational Science
University of Amsterdam
Kruislaan 403, 1098 SJ Amsterdam
the Netherlands
http://carol.wins.uva.nl/~dshamoni/

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