#include "vtkImage3DCroppingBoxCallback.h"

#include <vtkBoxWidget.h>
#include <vtkPolyData.h>

void vtkImage3DCroppingBoxCallback::Execute ( vtkObject *caller, unsigned long, void* )
{

  if( !this->VolumeMapper )
  {
    return;
  }
  
  // get the box widget
  vtkBoxWidget *widget = reinterpret_cast<vtkBoxWidget*>(caller);

  if( !widget )
  {
    return;
  }
  

  // Get the poly data defined by the vtkBoxWidget
  vtkPolyData* myBox = vtkPolyData::New();
  widget->GetPolyData(myBox);

  double bounds[6]={0.0,0.0,0.0,0.0,0.0,0.0};
  this->VolumeMapper->GetBounds(bounds);
  
  // myBox contains 15 points and points 8 to 13
  // define the bounding box
  double xmin, xmax, ymin, ymax, zmin, zmax;
  double* pt = myBox->GetPoint(8);
  xmin = pt[0];
  pt = myBox->GetPoint(9);
  xmax = pt[0];
  pt = myBox->GetPoint(10);
  ymin = pt[1];
  pt = myBox->GetPoint(11);
  ymax = pt[1];
  pt = myBox->GetPoint(12);
  zmin = pt[2];
  pt = myBox->GetPoint(13);
  zmax = pt[2];

  if(xmin<bounds[0]) xmin=bounds[0];
  if(ymin<bounds[2]) ymin=bounds[2];
  if(zmin<bounds[4]) zmin=bounds[4];
  if(xmax>bounds[1]) xmax=bounds[1];
  if(ymax>bounds[3]) ymax=bounds[3];
  if(zmax>bounds[5]) zmax=bounds[5];

  
  this->VolumeMapper->SetCroppingRegionPlanes(xmin, xmax, ymin, ymax, zmin, zmax);
    
  myBox->Delete();
}