cxCameraControl.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
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/*
 * 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"

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;

        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)
{

}

CameraControl::~CameraControl()
{

}

/*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());
}

QActionGroup* CameraControl::createStandard3DViewActions()
{
        QActionGroup* group = new QActionGroup(this);
        this->addStandard3DViewAction("A", "Anterior View", Vector3D(0, 1, 0), group);
        this->addStandard3DViewAction("P", "Posterior View", Vector3D(0, -1, 0), group);
        this->addStandard3DViewAction("S", "Superior View", Vector3D(0, 0, -1), group);
        this->addStandard3DViewAction("I", "Inferior View", Vector3D(0, 0, 1), group);
        this->addStandard3DViewAction("L", "Left View", Vector3D(-1, 0, 0), group);
        this->addStandard3DViewAction("R", "Right View", Vector3D(1, 0, 0), group);
        this->addStandard3DViewAction("O", "Orthogonal View", Vector3D(-1, 1, -1).normal(), 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, SIGNAL(triggered()), this, SLOT(setStandard3DViewActionSlot()));
        return action;
}

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

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());

        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 dir = (focus-direction).normal();

        Vector3D left = cross(vup, viewDirection);
        if (similar(left.length(), 0.0))
                left = Vector3D(1, 0, 0);
        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