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/*=========================================================================
Program: Visualization Toolkit
Module: vtkVRHardwarePicker.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 "vtkVRHardwarePicker.h"
#include "vtkCamera.h"
#include "vtkCommand.h"
#include "vtkHardwareSelector.h"
#include "vtkObjectFactory.h"
#include "vtkRenderer.h"
#include "vtkSelection.h"
#include "vtkTransform.h"
#include "vtkVRRenderWindow.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkVRHardwarePicker);
vtkSelection* vtkVRHardwarePicker::GetSelection()
{
return this->Selection;
}
// set up for a pick
void vtkVRHardwarePicker::Initialize()
{
this->Superclass::Initialize();
}
// Pick from the given collection
int vtkVRHardwarePicker::PickProp(
double p0[3], double wxyz[4], vtkRenderer* renderer, vtkPropCollection*, bool actorPassOnly)
{
// Initialize picking process
this->Initialize();
this->Renderer = renderer;
// Invoke start pick method if defined
this->InvokeEvent(vtkCommand::StartPickEvent, nullptr);
vtkVRRenderWindow* renWin = vtkVRRenderWindow::SafeDownCast(renderer->GetRenderWindow());
if (!renWin)
{
return 0;
}
vtkNew<vtkHardwareSelector> sel;
sel->SetFieldAssociation(vtkDataObject::FIELD_ASSOCIATION_CELLS);
sel->SetRenderer(renderer);
sel->SetActorPassOnly(actorPassOnly);
vtkCamera* oldcam = renderer->GetActiveCamera();
renWin->SetTrackHMD(false);
vtkNew<vtkTransform> tran;
tran->RotateWXYZ(wxyz[0], wxyz[1], wxyz[2], wxyz[3]);
double pin[4] = { 0.0, 0.0, -1.0, 1.0 };
double dop[4];
tran->MultiplyPoint(pin, dop);
double distance = oldcam->GetDistance();
oldcam->SetPosition(p0);
oldcam->SetFocalPoint(
p0[0] + dop[0] * distance, p0[1] + dop[1] * distance, p0[2] + dop[2] * distance);
oldcam->OrthogonalizeViewUp();
const int* size = renderer->GetSize();
sel->SetArea(size[0] / 2 - 5, size[1] / 2 - 5, size[0] / 2 + 5, size[1] / 2 + 5);
this->Selection = nullptr;
if (sel->CaptureBuffers())
{
unsigned int outPos[2];
unsigned int inPos[2] = { static_cast<unsigned int>(size[0] / 2),
static_cast<unsigned int>(size[1] / 2) };
// find the data closest to the center
vtkHardwareSelector::PixelInformation pinfo = sel->GetPixelInformation(inPos, 5, outPos);
if (pinfo.Valid)
{
this->Selection.TakeReference(
sel->GenerateSelection(outPos[0], outPos[1], outPos[0], outPos[1]));
}
}
// this->Selection = sel->Select();
// sel->SetArea(0, 0, size[0]-1, size[1]-1);
renWin->SetTrackHMD(true);
this->InvokeEvent(vtkCommand::EndPickEvent, this->Selection);
if (this->Selection && this->Selection->GetNode(0))
{
return 1;
}
else
{
return 0;
}
}
//------------------------------------------------------------------------------
void vtkVRHardwarePicker::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
if (this->Selection)
{
this->Selection->PrintSelf(os, indent);
}
}
VTK_ABI_NAMESPACE_END
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