PlaneType.cc

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#include "PlaneType.hh"

namespace ACG {
namespace Geometry {


void Plane::setPlane(const ACG::Vec3d& _position, const ACG::Vec3d& _xDirection, const ACG::Vec3d& _yDirection)
{
  position   = _position;
  xDirection = _xDirection;
  yDirection = _yDirection;
  normal     = (_xDirection % _yDirection).normalize();
}

//----------------------------------------------------------------

void Plane::setPlane(const ACG::Vec3d& _position, const ACG::Vec3d& _normal)
{

  //find a non zero component
  int comp = -1;
  for (int i=0; i < 3; i++)
    if ( _normal[i] != 0.0 ){
      comp = i;
      break;
    }

  if (comp == -1){
    std::cerr << "PlaneNode: normal is invalid!" << std::endl;
    return;
  }

  //compute orthogonal vectors in the plane
  xDirection[comp] = (-_normal[ (comp + 1) % 3 ] - _normal[(comp + 2) % 3]) / _normal[comp];
  xDirection[ (comp + 1) % 3 ] = 1;
  xDirection[ (comp + 2) % 3 ] = 1;
  xDirection = xDirection.normalize();

  yDirection = _normal % xDirection;
  yDirection = yDirection.normalize();

  position = _position;
  normal   = _normal;
}

//----------------------------------------------------------------

void Plane::transform(const ACG::Matrix4x4d& _mat)
{
  position    = _mat.transform_point(position);
  xDirection  = _mat.transform_vector(xDirection);
  yDirection  = _mat.transform_vector(yDirection);

  normal      = (xDirection % yDirection).normalize();
}

//----------------------------------------------------------------

void Plane::setSize(double _xDirection, double _yDirection)
{
  xDirection = xDirection.normalize() * _xDirection;
  yDirection = yDirection.normalize() * _yDirection;
}

}} // namespaces

//=============================================================================