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

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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#include "cxSliceComputer.h"
#include "cxDefinitions.h"
#include <math.h>

namespace cx
{

SlicePlane::SlicePlane(const Vector3D& c_, const Vector3D& i_, const Vector3D& j_) :
        c(c_), i(i_), j(j_)
{
}

std::ostream& operator<<(std::ostream& s, const SlicePlane& val)
{
        s << "center   : " << val.c << std::endl;
        s << "i_vector : " << val.i << std::endl;
        s << "j_vector : " << val.j << std::endl;
        return s;
}

bool similar(const SlicePlane& a, const SlicePlane& b)
{
        return similar(a.c, b.c) && similar(a.i, b.i) && similar(a.j, b.j);
}

SliceComputer::SliceComputer() :
        mClinicalApplication(mdNEUROLOGICAL),
        mOrientType(otORTHOGONAL),
        mPlaneType(ptAXIAL),
        mFollowType(ftFIXED_CENTER),
        mFixedCenter(Vector3D(0,0,0)),
        m_rMt(Transform3D::Identity()),
        mToolOffset(0.0),
        mUseGravity(false),
        mGravityDirection(Vector3D(0,0,-1)) ,
        mUseViewOffset(false),
        mViewportHeight(1),
        mViewOffset(0.5),
        mUseConstrainedViewOffset(false)
{
}

SliceComputer::~SliceComputer()
{
}

void SliceComputer::initializeFromPlane(PLANE_TYPE plane, bool useGravity, const Vector3D& gravityDir, bool useViewOffset, double viewportHeight, double toolViewOffset, CLINICAL_VIEW application, bool useConstrainedViewOffset)
{
        setPlaneType(plane);
        mClinicalApplication = application;

        if (plane == ptSAGITTAL || plane == ptCORONAL || plane == ptAXIAL )
        {
                setOrientationType(otORTHOGONAL);
                setFollowType(ftFIXED_CENTER);
        }
        else if (plane == ptANYPLANE || plane==ptRADIALPLANE || plane==ptSIDEPLANE)
        {
                setOrientationType(otOBLIQUE);
                setFollowType(ftFOLLOW_TOOL);

                setGravity(useGravity, gravityDir);
                setToolViewOffset(useViewOffset, viewportHeight, toolViewOffset, useConstrainedViewOffset); // TODO finish this one
        }
}

void SliceComputer::setClinicalApplication(CLINICAL_VIEW application)
{
        mClinicalApplication = application;
}

ORIENTATION_TYPE SliceComputer::getOrientationType() const
{
        return mOrientType;
}

PLANE_TYPE SliceComputer::getPlaneType() const
{
        return mPlaneType;
}

Transform3D SliceComputer::getToolPosition() const
{
        return m_rMt;
}

void SliceComputer::setToolPosition(const Transform3D& rMt) 
{ 
        m_rMt = rMt; 
}

void SliceComputer::setOrientationType(ORIENTATION_TYPE val) 
{ 
        mOrientType = val; 
}

void SliceComputer::setPlaneType(PLANE_TYPE val) 
{ 
        mPlaneType = val; 
}

void SliceComputer::setFixedCenter(const Vector3D& center) 
{ 
        mFixedCenter = center; 
}

void SliceComputer::setFollowType(FOLLOW_TYPE val) 
{ 
        mFollowType = val; 
}

void SliceComputer::setGravity(bool use, const Vector3D& dir) 
{ 
        mUseGravity = use; 
        mGravityDirection = dir; 
}

void SliceComputer::setToolOffset(double val) 
{ 
        mToolOffset = val; 
}

void SliceComputer::setToolViewOffset(bool use, double viewportHeight, double viewOffset, bool useConstrainedViewOffset) 
{
        mUseViewOffset = use; 
        mViewportHeight = viewportHeight; 
        mViewOffset = viewOffset;
        mUseConstrainedViewOffset = useConstrainedViewOffset;
}

void SliceComputer::setToolViewportHeight(double viewportHeight)
{
        mViewportHeight = viewportHeight; 
}

SlicePlane SliceComputer::getPlane()  const
{
        std::pair<Vector3D,Vector3D> basis = generateBasisVectors();
        SlicePlane plane;
        plane.i = basis.first;
        plane.j = basis.second;
        plane.c = Vector3D(0,0,mToolOffset);

        // transform position from tool to reference space
        plane.c = m_rMt.coord(plane.c);
        // transform orientation from tool to reference space for the oblique case only
        if (mOrientType==otOBLIQUE)
        {
                plane.i = m_rMt.vector(plane.i);
                plane.j = m_rMt.vector(plane.j);
        }

        // orient planes so that gravity is down
        plane = orientToGravity(plane);

        // try to to this also for oblique views, IF the ftFIXED_CENTER is set.
        // use special acs centermod algo
        plane.c = generateFixedIJCenter(mFixedCenter, plane.c, plane.i, plane.j);

        // set center so that it is a fixed distance from viewport top
        plane = applyViewOffset(plane);

        return plane; 
}

SlicePlane SliceComputer::applyViewOffset(const SlicePlane& base) const
{
        if (!mUseViewOffset)
        {
                return base;
        }

        double centerOffset = this->getViewOffsetAbsoluteFromCenter();

        SlicePlane retval = base;
        if (mUseConstrainedViewOffset)
        {
                Vector3D toolOffsetCenter = m_rMt.coord(Vector3D(0,0,mToolOffset));
                Vector3D newCenter = toolOffsetCenter + centerOffset * base.j;
                double toolOffsetDistance = dot(newCenter - base.c, base.j);

                Vector3D toolCenter = m_rMt.coord(Vector3D(0,0,0));
                newCenter = toolCenter - centerOffset * base.j;
                double toolDistance = dot(newCenter - base.c, base.j);
                double usedDistance = std::min(toolOffsetDistance, toolDistance);
                retval.c = base.c + usedDistance * base.j; // extract j-component of newCenter
        }
        else
        {
                Vector3D toolCenter = m_rMt.coord(Vector3D(0,0,mToolOffset));
                Vector3D newCenter = toolCenter - centerOffset * base.j;
                double distance = dot(newCenter - base.c, base.j);
                retval.c = base.c + distance * base.j; // extract j-component of newCenter
        }
        return retval;
}

double SliceComputer::getViewOffsetAbsoluteFromCenter() const
{
        if (mPlaneType==ptRADIALPLANE)
                return 0; // position in the center

        return mViewportHeight*(0.5-mViewOffset);
}

std::pair<Vector3D,Vector3D> SliceComputer::generateBasisVectors() const
{
        switch (mClinicalApplication)
        {
        case mdRADIOLOGICAL:
                return this->generateBasisVectorsRadiology();
        case mdNEUROLOGICAL:
        default:
                return this->generateBasisVectorsNeurology();
        }
}

std::pair<Vector3D,Vector3D> SliceComputer::generateBasisVectorsNeurology() const
{
        switch (mPlaneType)
        {
        // use left-right ordering for axial/coronal
        case ptAXIAL:       return std::make_pair(Vector3D(-1, 0, 0), Vector3D( 0,-1, 0));
        case ptCORONAL:     return std::make_pair(Vector3D(-1, 0, 0), Vector3D( 0, 0, 1));
        case ptSAGITTAL:    return std::make_pair(Vector3D( 0, 1, 0), Vector3D( 0, 0, 1));

        // use planes corresponding to the cx Tool definitions
        case ptANYPLANE:    return std::make_pair(Vector3D( 0,-1, 0), Vector3D( 0, 0,-1));
        case ptSIDEPLANE:   return std::make_pair(Vector3D(-1, 0, 0), Vector3D( 0, 0,-1));
        case ptRADIALPLANE: return std::make_pair(Vector3D( 0,-1, 0), Vector3D(-1, 0, 0));
        default:
                throw std::exception();
        }
}

std::pair<Vector3D,Vector3D> SliceComputer::generateBasisVectorsRadiology() const
{
        switch (mPlaneType)
        {
        // use right-left ordering for axial/coronal
        case ptAXIAL:       return std::make_pair(Vector3D( 1, 0, 0), Vector3D( 0,-1, 0));
        case ptCORONAL:     return std::make_pair(Vector3D( 1, 0, 0), Vector3D( 0, 0, 1));
        case ptSAGITTAL:    return std::make_pair(Vector3D( 0, 1, 0), Vector3D( 0, 0, 1));

        // use planes corresponding to the cx Tool definitions
        case ptANYPLANE:    return std::make_pair(Vector3D( 0,-1, 0), Vector3D( 0, 0,-1));
        case ptSIDEPLANE:   return std::make_pair(Vector3D(-1, 0, 0), Vector3D( 0, 0,-1));
        case ptRADIALPLANE: return std::make_pair(Vector3D( 0,-1, 0), Vector3D(-1, 0, 0));
        default:
                throw std::exception();
        }
}


Vector3D SliceComputer::generateFixedIJCenter(const Vector3D& center_r, const Vector3D& cross_r, const Vector3D& i, const Vector3D& j) const
{
        if (mFollowType==ftFIXED_CENTER)
        {
                // r is REF, s is SLICE
                Transform3D M_rs = createTransformIJC(i, j, Vector3D(0,0,0)); // transform from data to slice, zero center.
                Transform3D M_sr = M_rs.inv();
                Vector3D center_s = M_sr.coord(center_r);
                Vector3D cross_s = M_sr.coord(cross_r);
                // in SLICE space, use {xy} values from center and {z} value from cross.
                Vector3D q_s(center_s[0], center_s[1], cross_s[2]);
                Vector3D q_r = M_rs.coord(q_s);
                return q_r;
        }
        return cross_r;
}

SlicePlane SliceComputer::orientToGravity(const SlicePlane& base) const
{
        if (!mUseGravity)
        {
                return base;
        }

        SlicePlane retval = base;
        const Vector3D k = cross(base.i, base.j); // plane normal. Constant
        Vector3D up;
        up = -mGravityDirection; // normal case

        // weight of nongravity, 0=<w=<1, 1 means dont use gravity
        double w_n = dot(up, k); 
        w_n = w_n*w_n; // square to keep stability near normal use.

        Vector3D i_g = cross(up, k); //  |i_g| varies from 0 to 1 depending on 1-w_n
        Vector3D i_n = base.i; // |i_n|==1


        // set i vector to a weighted mean of the two definitions
        // can also experiment with a tanh function or simply a linear interpolation
        //
        // Note: i_g is already small here if w_n is small, this will increase
        // the effect of i_n. Investigate.
        //
        retval.i = i_g*(1.0-w_n) + i_n*w_n; 
        retval.i = retval.i.normal(); // |i|==1 
        retval.j = cross(k, retval.i);

        return retval;
}


} // namespace cx