// Copyright (C) 1999-2015
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"

#include "context.h"
#include "frame3dbase.h"
#include "fitsimage.h"

Vector3d Frame3dBase::mapFromRef3d(const Vector& vv, Coord::InternalSystem sys)
{
  // context->slice() IMAGE (ranges 1-n)
  double sl = keyContext->slice(2)-.5;
  return mapFromRef3d(vv,sys,sl);
}

Vector3d Frame3dBase::mapFromRef3d(const Vector& vv, Coord::InternalSystem sys, 
				   double sl)
{
  // note: sl is in REF=DATA coordinates
  Matrix3d mm;
  switch (sys) {
  case Coord::REF:
    return Vector3d(vv,sl);
  case Coord::USER:
    mm = refToUser3d;
    break;
  case Coord::WIDGET:
    mm = refToWidget3d;
    break;
  case Coord::CANVAS:
    mm = refToCanvas3d;
    break;
  case Coord::WINDOW:
    mm = refToWindow3d;
    break;
  case Coord::PANNER:
    mm = refToPanner3d;
    break;
  case Coord::MAGNIFIER:
    mm = refToMagnifier3d;
    break;
  }

  return Vector3d(vv,sl)*mm;
}

Vector3d Frame3dBase::mapToRef3d(const Vector& vv, Coord::InternalSystem sys)
{
  // context->slice() IMAGE (ranges 1-n)
  double sl = keyContext->slice(2)-.5;
  return mapToRef3d(vv,sys,sl);
}

Vector3d Frame3dBase::mapToRef3d(const Vector& vv, Coord::InternalSystem sys, 
				 double sl)
{
  switch (sys) {
  case Coord::REF:
    return Vector3d(vv,sl);
  case Coord::USER:
    return Vector3d(vv,sl)*userToRef3d;
  }
 
  // note: sl is in REF=DATA coordinates
  Vector3d xx = Vector3d(1,0,sl)*refToWidget3d;
  Vector3d yy = Vector3d(0,1,sl)*refToWidget3d;
  Vector3d zz = Vector3d(0,0,sl)*refToWidget3d;

  Vector3d ii=xx-zz;
  Vector3d jj=yy-zz;
  Vector3d nn = cross(jj,ii).normalize();
  double& a = nn[0];
  double& b = nn[1];
  double& c = nn[2];
  double d = -a*xx[0] -b*xx[1] -c*xx[2];

  Vector ww;
  switch (sys) {
  case Coord::WIDGET:
    ww = vv;
    break;
  case Coord::CANVAS:
    ww = vv*canvasToWidget;
    break;
  case Coord::WINDOW:
    ww = vv*windowToWidget;
    break;
  case Coord::PANNER:
    ww = vv*pannerToWidget;
    break;
  case Coord::MAGNIFIER:
    ww = vv*magnifierToWidget;
    break;
  }

  double z = (-a*ww[0] -b*ww[1] -d)/c;
  return Vector3d(ww,z)*widgetToRef3d;
}

