cxCameraControl.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.
                 
Copyright (c) SINTEF Department of Medical Technology.
All rights reserved.
                 
CustusX is released under a BSD 3-Clause license.
                 
See Lisence.txt (https://github.com/SINTEFMedtek/CustusX/blob/master/License.txt) for details.
=========================================================================*/

/*
 * cxCameraControl.cpp
 *
 *  \date Oct 15, 2010
 *      \author christiana
 */
#include "cxCameraControl.h"

#include <QAction>
#include "vtkRenderer.h"
#include "vtkCamera.h"
#include "cxView.h"
#include <QDomNode>
#include "cxTypeConversions.h"
#include "cxLogger.h"

namespace cx
{

CameraData::CameraData()
{
}

void CameraData::setCamera(vtkCameraPtr camera)
{
        mCamera = camera;
}

vtkCameraPtr CameraData::getCamera() const
{
        if (!mCamera)
                mCamera = vtkCameraPtr::New();
        return mCamera;
}

void CameraData::addTextElement(QDomNode parentNode, QString name, QString value) const
{
        QDomDocument doc = parentNode.ownerDocument();
        QDomElement node = doc.createElement(name);
        node.appendChild(doc.createTextNode(value));
        parentNode.appendChild(node);
}

void CameraData::addXml(QDomNode dataNode) const
{
        if (!mCamera)
                return;

        this->addTextElement(dataNode, "position", qstring_cast(Vector3D(mCamera->GetPosition())));
        this->addTextElement(dataNode, "focalPoint", qstring_cast(Vector3D(mCamera->GetFocalPoint())));
        this->addTextElement(dataNode, "viewUp", qstring_cast(Vector3D(mCamera->GetViewUp())));
        this->addTextElement(dataNode, "nearClip", qstring_cast(mCamera->GetClippingRange()[0]));
        this->addTextElement(dataNode, "farClip", qstring_cast(mCamera->GetClippingRange()[1]));
        this->addTextElement(dataNode, "parallelScale", qstring_cast(mCamera->GetParallelScale()));
}

void CameraData::parseXml(QDomNode dataNode)
{
        Vector3D position = Vector3D::fromString(dataNode.namedItem("position").toElement().text());
        Vector3D focalPoint = Vector3D::fromString(dataNode.namedItem("focalPoint").toElement().text());
        Vector3D viewUp = Vector3D::fromString(dataNode.namedItem("viewUp").toElement().text());
        double nearClip = dataNode.namedItem("nearClip").toElement().text().toDouble();
        double farClip = dataNode.namedItem("farClip").toElement().text().toDouble();
        double parallelScale = dataNode.namedItem("parallelScale").toElement().text().toDouble();

        if (similar(viewUp.length(), 0.0))
                return; // ignore reading if undefined data
        double LARGE_NUMBER = 1.0E6; // corresponding to a distance of 1km - unphysical for human-sized data
        if ((position-focalPoint).length() > LARGE_NUMBER)
                return;
        if (focalPoint.length() > LARGE_NUMBER)
                return;
        if (fabs(parallelScale) > LARGE_NUMBER)
                return;
        if(similar(position, focalPoint))
                return;

        this->getCamera();

        mCamera->SetClippingRange(nearClip, farClip);
        mCamera->SetPosition(position.begin());
        mCamera->SetFocalPoint(focalPoint.begin());
        mCamera->ComputeViewPlaneNormal();
        mCamera->SetViewUp(viewUp.begin());
        mCamera->SetParallelScale(parallelScale);
}



CameraControl::CameraControl(QObject* parent) :
        QObject(parent),
        mSuperiorViewAction(NULL),
        mAnteriorViewAction(NULL)
{
}

CameraControl::~CameraControl()
{
}

Vector3D CameraControl::AnteriorDirection()
{
        return Vector3D(0, 1, 0);
}
Vector3D CameraControl::PosteriorDirection()
{
        return Vector3D(0, -1, 0);
}
Vector3D CameraControl::SuperiorDirection()
{
        return Vector3D(0, 0, -1);
}
Vector3D CameraControl::InferiorDirection()
{
        return Vector3D(0, 0, 1);
}
Vector3D CameraControl::LeftDirection()
{
        return Vector3D(-1, 0, 0);
}
Vector3D CameraControl::RightDirection()
{
        return Vector3D(1, 0, 0);
}
Vector3D CameraControl::OrthogonalDirection()
{
        return Vector3D(-1, 1, -1).normal();
}

/*Move the camera focus to p_r. Keep the view direction and distance constant
 * (i.e. keep pos of camera constant relative to focus).
 *
 */
void CameraControl::translateByFocusTo(Vector3D p_r)
{
        vtkCameraPtr camera = this->getCamera();
        if (!camera)
                return;

        Vector3D f(camera->GetFocalPoint());
        Vector3D p(camera->GetPosition());
        Vector3D delta = p_r - f;
        f += delta;
        p += delta;
        camera->SetFocalPoint(f.begin());
        camera->SetPosition(p.begin());
}

void CameraControl::setSuperiorView() const
{
        if(mSuperiorViewAction)
                mSuperiorViewAction->trigger();
}

void CameraControl::setAnteriorView() const
{
        if(mAnteriorViewAction)
                mAnteriorViewAction->trigger();
}

QActionGroup* CameraControl::createStandard3DViewActions()
{
        QActionGroup* group = new QActionGroup(this);
        mAnteriorViewAction = this->addStandard3DViewAction("A", "Anterior View", AnteriorDirection(), group);
        this->addStandard3DViewAction("P", "Posterior View", PosteriorDirection(), group);
        mSuperiorViewAction = this->addStandard3DViewAction("S", "Superior View", SuperiorDirection(), group);
        this->addStandard3DViewAction("I", "Inferior View", InferiorDirection(), group);
        this->addStandard3DViewAction("L", "Left View", LeftDirection(), group);
        this->addStandard3DViewAction("R", "Right View", RightDirection(), group);
        this->addStandard3DViewAction("O", "Orthogonal View", OrthogonalDirection(), group);
        return group;
}

QAction* CameraControl::addStandard3DViewAction(QString caption, QString help, Vector3D viewDirection,
        QActionGroup* group)
{
        QAction* action = new QAction(help, group);
        action->setStatusTip(help);
        action->setWhatsThis(help);
        action->setIcon(QIcon(":/icons/camera_view_" + caption + ".png"));
        //  QFont font;
        //  font.setBold(true);
        //  if (font.pointSize()>=0)
        //    font.setPointSize(font.pointSize()*1.5);
        //  action->setFont(font);
        action->setData(QVariant(qstring_cast(viewDirection)));
        connect(action, &QAction::triggered, this, &CameraControl::setStandard3DViewActionSlot);
        return action;
}

void CameraControl::refreshView(ViewPtr view)
{
        this->setView(view);
        if(view)
                view->getRenderer()->ResetCameraClippingRange();
}

void CameraControl::setView(ViewPtr view)
{
        mView = view;
}

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

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

void CameraControl::setStandard3DViewActionSlot()
{
        QAction* action = dynamic_cast<QAction*> (sender());
        if (!action)
                return;
        Vector3D viewDirection = Vector3D::fromString(action->data().toString());
        this->setStandard3DView(viewDirection);
}

void CameraControl::setStandard3DView(Vector3D viewDirection)
{
        vtkRendererPtr renderer = this->getRenderer();
        if (!renderer)
                return;
        vtkCameraPtr camera = this->getCamera();

        renderer->ResetCamera();

        Vector3D focus(camera->GetFocalPoint());
        Vector3D pos = focus - 500 * viewDirection;
        Vector3D vup(0, 0, 1);

        Vector3D left = cross(vup, viewDirection);
        if (similar(left.length(), 0.0))
                left = RightDirection();
        vup = cross(viewDirection, left).normal();

        camera->SetPosition(pos.begin());
        camera->SetViewUp(vup.begin());

        renderer->ResetCamera(); // let vtk do the zooming base work
        camera->Dolly(1.5); // zoom in a bit more than the default vtk value
        renderer->ResetCameraClippingRange();
}

} // namespace cx