cxViewportListener.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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modification, are permitted provided that the following conditions are met:

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   this list of conditions and the following disclaimer.

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   this list of conditions and the following disclaimer in the documentation 
   and/or other materials provided with the distribution.

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   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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=========================================================================*/
#include "cxViewportListener.h"
#include "vtkRenderer.h"
#include "cxVector3D.h"
#include "vtkCamera.h"
#include "vtkCommand.h"
#include "cxLogger.h"

namespace cx
{

class ViewportObserverPrivate : public vtkCommand
{
public:
        ViewportObserverPrivate() : mBase(NULL) {}
        static ViewportObserverPrivate* New() {return new ViewportObserverPrivate;}
        void SetBase(ViewportListenerBase* base) {mBase = base;}
        virtual void Execute(vtkObject* caller, unsigned long, void*)
        {
                if (mBase)
                        mBase->callback();
        }
        ViewportListenerBase* mBase;
};


ViewportListenerBase::ViewportListenerBase()
{

}

ViewportListenerBase::~ViewportListenerBase()
{
//      this->stopListen();
}

void ViewportListenerBase::startListen(vtkRendererPtr renderer)
{
        mRenderer = renderer;

        // turn on observer
        if (!mObserver)
        {
                mObserver = ViewportObserverPrivatePtr::New();
                mObserver->SetBase(this);
                this->addObservers();
//              mRenderer->GetActiveCamera()->AddObserver(vtkCommand::ModifiedEvent, mObserver); // needed during startup
//              mRenderer->AddObserver(vtkCommand::ModifiedEvent, mObserver); // camera changes, viewport changes
//              mRenderer->AddObserver(vtkCommand::ActiveCameraEvent, mObserver);
//              mRenderer->AddObserver(vtkCommand::ResetCameraEvent, mObserver);
                //        mRenderer->AddObserver(vtkCommand::CreateCameraEvent, mObserver);
                //        mRenderer->AddObserver(vtkCommand::LeaveEvent, mObserver);
        }
}


void ViewportListenerBase::stopListen()
{
        // turn off observer
        if (mObserver)
        {
                mObserver->SetBase(NULL);
                this->removeObservers();

//              mRenderer->GetActiveCamera()->RemoveObserver(mObserver);
//              mRenderer->RemoveObserver(mObserver);

//              if (mRenderer->GetActiveCamera()->HasObserver(vtkCommand::ModifiedEvent, mObserver))
//                      std::cout << "ERROR camera vtkCommand::ModifiedEvent" << std::endl;
//              if (mRenderer->HasObserver(vtkCommand::ModifiedEvent, mObserver))
//                      std::cout << "ERROR vtkCommand::ModifiedEvent" << std::endl;
//              if (mRenderer->HasObserver(vtkCommand::ActiveCameraEvent, mObserver))
//                      std::cout << "ERROR vtkCommand::ActiveCameraEvent" << std::endl;
//              if (mRenderer->HasObserver(vtkCommand::ResetCameraEvent, mObserver))
//                      std::cout << "ERROR vtkCommand::ResetCameraEvent" << std::endl;

                mObserver = 0;
        }
}

bool ViewportListenerBase::isListening() const
{
        return mObserver!=0;
}

void ViewportListenerBase::setCallback(boost::function<void ()> func)
{
        mCallback = func;
}

void ViewportListenerBase::callback()
{
        if (mCallback)
                mCallback();
}

double ViewportListenerBase::getVpnZoom()
{
        vtkCameraPtr camera = mRenderer->GetActiveCamera();
        Vector3D p_f(camera->GetFocalPoint());
        return this->getVpnZoom(p_f);
}

double ViewportListenerBase::getVpnZoom(Vector3D focalPoint)
{
        if (!mRenderer)
        {
                reportError("No renderer set, using zoom=1");
                return 1;
        }
        //  use the focal point and focal point + vup.
        //  Transform both to view space and remove z-coord.
        //  The distance between then in the view plane can
        //  be used to rescale the text.
        vtkCameraPtr camera = mRenderer->GetActiveCamera();
        Vector3D p_f(focalPoint);
        Vector3D vup(camera->GetViewUp());
        Vector3D p_fup = p_f+vup;

        mRenderer->WorldToView(p_f[0],p_f[1],p_f[2]);
        mRenderer->WorldToView(p_fup[0],p_fup[1],p_fup[2]);
        p_f[2] = 0;
        p_fup[2] = 0;
        double size = (p_f - p_fup).length()/2.0;
        return size;
}

//---------------------------------------------------------
//---------------------------------------------------------
//---------------------------------------------------------

void ViewportListener::addObservers()
{
        mRenderer->GetActiveCamera()->AddObserver(vtkCommand::ModifiedEvent, mObserver); // needed during startup
        mRenderer->AddObserver(vtkCommand::ModifiedEvent, mObserver); // camera changes, viewport changes
        mRenderer->AddObserver(vtkCommand::ActiveCameraEvent, mObserver);
        mRenderer->AddObserver(vtkCommand::ResetCameraEvent, mObserver);
}
void ViewportListener::removeObservers()
{
        mRenderer->GetActiveCamera()->RemoveObserver(mObserver);
        mRenderer->RemoveObserver(mObserver);
}

ViewportListener::~ViewportListener()
{
        this->stopListen();
}

//---------------------------------------------------------
//---------------------------------------------------------
//---------------------------------------------------------

ViewportPreRenderListener::ViewportPreRenderListener() : mModified(true)
{
}

void ViewportPreRenderListener::setModified()
{
        mModified = true;
}

void ViewportPreRenderListener::callback()
{
        if (!mModified)
                return;
        ViewportListenerBase::callback();
        mModified = false;
}

void ViewportPreRenderListener::addObservers()
{
        mRenderer->AddObserver(vtkCommand::StartEvent, mObserver, 1.0);
}
void ViewportPreRenderListener::removeObservers()
{
        mRenderer->RemoveObserver(mObserver);
}

ViewportPreRenderListener::~ViewportPreRenderListener()
{
        this->stopListen();
}

}