cxCameraStyleForView.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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#include "cxCameraStyleForView.h"

#include <vtkRenderer.h>
#include <vtkCamera.h>

#include "cxTrackingService.h"
#include "cxToolRep3D.h"
#include "cxView.h"
#include "boost/bind.hpp"
#include <vtkRenderWindow.h>
#include "vtkInteractorStyleUnicam.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "cxCoreServices.h"
#include "cxViewportListener.h"

#include "cxTool.h"
#include <vtkRenderWindowInteractor.h>
#include "cxPatientModelService.h"
#include "cxRepContainer.h"
#include "cxLogger.h"

SNW_DEFINE_ENUM_STRING_CONVERTERS_BEGIN(cx, CAMERA_STYLE_TYPE, cstCOUNT)
{
        "DEFAULT_STYLE",
        "TOOL_STYLE",
        "ANGLED_TOOL_STYLE",
        "UNICAM_STYLE"
}
SNW_DEFINE_ENUM_STRING_CONVERTERS_END(cx, CAMERA_STYLE_TYPE, cstCOUNT)

namespace cx
{

CameraStyleForView::CameraStyleForView(CoreServicesPtr backend) :
        mCameraStyleForView(cstDEFAULT_STYLE),
        mBlockCameraUpdate(false),
        mBackend(backend)
{
        mViewportListener.reset(new ViewportListener);
        mViewportListener->setCallback(boost::bind(&CameraStyleForView::viewportChangedSlot, this));

        mPreRenderListener.reset(new ViewportPreRenderListener);
        mPreRenderListener->setCallback(boost::bind(&CameraStyleForView::onPreRender, this));

        connect(mBackend->getToolManager().get(), SIGNAL(activeToolChanged(const QString&)), this, SLOT(activeToolChangedSlot()));
}

void CameraStyleForView::setView(ViewPtr widget)
{
        this->disconnectTool();
        mView = widget;
        this->connectTool();
}


ViewPtr CameraStyleForView::getView() const
{
        return mView;
}

void CameraStyleForView::viewportChangedSlot()
{
        if (mBlockCameraUpdate)
                return;
        this->updateCamera();
}

void CameraStyleForView::onPreRender()
{
        if (mFollowingTool)
                this->moveCameraToolStyleSlot(mFollowingTool->get_prMt(), mFollowingTool->getTimestamp());
}

ToolRep3DPtr CameraStyleForView::getToolRep() const
{
        if (!this->getView())
                return ToolRep3DPtr();

        ToolRep3DPtr rep = RepContainer(this->getView()->getReps()).findFirst<ToolRep3D>(mFollowingTool);
        return rep;
}

vtkRendererPtr CameraStyleForView::getRenderer() const
{
        if (!this->getView())
                return vtkRendererPtr();
        return this->getView()->getRenderer();
}

vtkCameraPtr CameraStyleForView::getCamera() const
{
        if (!this->getRenderer())
                return vtkCameraPtr();
        return this->getRenderer()->GetActiveCamera();
}

void CameraStyleForView::setModified()
{
        mPreRenderListener->setModified();
}

void CameraStyleForView::updateCamera()
{
        this->setModified();
}

void CameraStyleForView::moveCameraToolStyleSlot(Transform3D prMt, double timestamp)
{
        if (mCameraStyleForView == cstDEFAULT_STYLE)
                return;
        if (!mFollowingTool)
                return;


        vtkCameraPtr camera = this->getCamera();
        if (!camera)
                return;

        Transform3D rMpr = mBackend->getPatientService()->get_rMpr();

        Transform3D rMt = rMpr * prMt;

        double offset = mFollowingTool->getTooltipOffset();

        double cameraOffset = camera->GetDistance();

//      std::cout << "cameraOffset pre " << cameraOffset << std::endl;
//      std::cout << "rMt\n" << rMt << std::endl;
        Vector3D camera_r = rMt.coord(Vector3D(0, 0, offset - cameraOffset));
        Vector3D focus_r = rMt.coord(Vector3D(0, 0, offset));
//      std::cout << "cameraOffset ppost " << (focus_r-camera_r).length() << std::endl;
        Vector3D vup_r = rMt.vector(Vector3D(-1, 0, 0));
        if (mCameraStyleForView == cstANGLED_TOOL_STYLE)
        {
                // elevate 20*, but keep distance
                double height = cameraOffset * tan(20 / 180.0 * M_PI);
                camera_r += vup_r * height;
                Vector3D elevated = camera_r + vup_r * height;
                Vector3D n_foc2eye = (elevated - focus_r).normalized();
                camera_r = focus_r + cameraOffset * n_foc2eye;
        }

        Vector3D pos_old(camera->GetPosition());
        Vector3D focus_old(camera->GetFocalPoint());

        if (similar(pos_old, camera_r, 1) && similar(focus_old, focus_r, 1))
                return; // break update loop: this event is triggered by camera change.

//      std::cout << "pos " << pos_old << " to " << camera_r << std::endl;
//      std::cout << "foc " << focus_old << " to " << focus_r << std::endl;

        mBlockCameraUpdate = true;
        camera->SetPosition(camera_r.begin());
        camera->SetFocalPoint(focus_r.begin());
        camera->SetViewUp(vup_r.begin());
        camera->SetClippingRange(1, std::max<double>(1000, cameraOffset * 1.5));
        mBlockCameraUpdate = false;
}

void CameraStyleForView::activeToolChangedSlot()
{
        ToolPtr newTool = mBackend->getToolManager()->getActiveTool();
        if (newTool == mFollowingTool)
                return;

        this->disconnectTool();
        this->connectTool();
}

bool CameraStyleForView::isToolFollowingStyle(CAMERA_STYLE_TYPE style) const
{
        return ( style==cstTOOL_STYLE )||( style==cstANGLED_TOOL_STYLE);
}

void CameraStyleForView::connectTool()
{
        if (!this->isToolFollowingStyle(mCameraStyleForView))
                return;

        mFollowingTool = mBackend->getToolManager()->getActiveTool();

        if (!mFollowingTool)
                return;

        if (!this->getView())
                return;

        connect(mFollowingTool.get(), SIGNAL(toolTransformAndTimestamp(Transform3D, double)), this,
                        SLOT(setModified()));

        ToolRep3DPtr rep = this->getToolRep();
        if (rep)
        {
                rep->setOffsetPointVisibleAtZeroOffset(true);
                if (mCameraStyleForView == cstTOOL_STYLE)
                        rep->setStayHiddenAfterVisible(true);
        }

        mViewportListener->startListen(this->getRenderer());
        mPreRenderListener->startListen(this->getRenderer());

        this->updateCamera();

        report("Camera is following " + mFollowingTool->getName());
}

void CameraStyleForView::disconnectTool()
{
        if (mCameraStyleForView == cstDEFAULT_STYLE)
                return;

        mViewportListener->stopListen();
        mPreRenderListener->stopListen();

        if (mFollowingTool)
        {
                disconnect(mFollowingTool.get(), SIGNAL(toolTransformAndTimestamp(Transform3D, double)), this,
                        SLOT(setModified()));

                ToolRep3DPtr rep = this->getToolRep();
                if (rep)
                        rep->setStayHiddenAfterVisible(false);
        }

        mFollowingTool.reset();
}

void CameraStyleForView::setCameraStyle(CAMERA_STYLE_TYPE style)
{
        if (mCameraStyleForView == style)
                return;

        this->disconnectTool();

        ViewPtr view = this->getView();
        if (!view)
                return;
        vtkRenderWindowInteractor* interactor = view->getRenderWindow()->GetInteractor();

        switch (style)
        {
        case cstDEFAULT_STYLE:
        case cstTOOL_STYLE:
        case cstANGLED_TOOL_STYLE:
                interactor->SetInteractorStyle(vtkInteractorStyleTrackballCameraPtr::New());
                break;
        case cstUNICAM_STYLE:
                interactor->SetInteractorStyle(vtkInteractorStyleUnicamPtr::New());
        default:
                break;
        };

        mCameraStyleForView = style;

        this->connectTool();
}

}//namespace cx