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vtkPropPicker3D.cxx
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vtkPropPicker3D.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPropPicker3D.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkPropPicker3D.h"
#include "vtkAssemblyNode.h"
#include "vtkAssemblyPath.h"
#include "vtkCommand.h"
#include "vtkObjectFactory.h"
#include "vtkRenderer.h"
#include "vtkWorldPointPicker.h"
vtkStandardNewMacro(vtkPropPicker3D);
vtkPropPicker3D::vtkPropPicker3D()
{
this->PickFromProps = NULL;
}
vtkPropPicker3D::~vtkPropPicker3D()
{
}
// set up for a pick
void vtkPropPicker3D::Initialize()
{
this->vtkAbstractPropPicker::Initialize();
}
// Pick from the given collection
int vtkPropPicker3D::Pick(double selectionX, double selectionY,
double selectionZ, vtkRenderer *renderer)
{
if ( this->PickFromList )
{
return this->PickProp(selectionX, selectionY, selectionZ, renderer, this->PickList);
}
else
{
return this->PickProp(selectionX, selectionY, selectionZ, renderer);
}
}
// Pick from the given collection
int vtkPropPicker3D::PickProp(
double selectionX, double selectionY, double selectionZ,
vtkRenderer *renderer, vtkPropCollection* pickfrom)
{
this->PickFromProps = pickfrom;
int ret = this->PickProp(selectionX, selectionY, selectionZ, renderer);
this->PickFromProps = NULL;
return ret;
}
// Perform pick operation with selection point provided.
int vtkPropPicker3D::PickProp(
double selectionX, double selectionY, double selectionZ,
vtkRenderer *renderer)
{
// Initialize picking process
this->Initialize();
this->Renderer = renderer;
this->PickPosition[0] = selectionX;
this->PickPosition[1] = selectionY;
this->PickPosition[2] = selectionZ;
// Invoke start pick method if defined
this->InvokeEvent(vtkCommand::StartPickEvent,NULL);
// for each prop, that is packable
// find the prop whose bounds
// contain the pick points and whole center is closest to the
// selection point
// TODO need to handle AssemblyPaths
vtkPropCollection *props = renderer->GetViewProps();
vtkAssemblyPath *result = NULL;
vtkCollectionSimpleIterator pit;
props->InitTraversal(pit);
vtkProp *prop = NULL;
while ( (prop = props->GetNextProp(pit)) )
{
if (prop->GetPickable())
{
double *bnds = prop->GetBounds();
if (bnds)
{
if (selectionX >= bnds[0] && selectionX <= bnds[1] &&
selectionY >= bnds[2] && selectionY <= bnds[3] &&
selectionZ >= bnds[4] && selectionZ <= bnds[5])
{
prop->InitPathTraversal();
result = prop->GetNextPath();
}
}
}
}
if (result)
{
result->GetFirstNode()->GetViewProp()->Pick();
this->InvokeEvent(vtkCommand::PickEvent,NULL);
}
this->SetPath(result);
this->InvokeEvent(vtkCommand::EndPickEvent,NULL);
// Call Pick on the Prop that was picked, and return 1 for success
if ( result )
{
return 1;
}
else
{
return 0;
}
}
void vtkPropPicker3D::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
if (this->PickFromProps)
{
os << indent << "PickFrom List: " << this->PickFromProps << endl;
}
else
{
os << indent << "PickFrom List: (none)" << endl;
}
}