//=======================================================================//
// File:		line.cpp                                                     //
// Project: Architecture                                                 //
// Author:	J.M. Albertson                                               //
//-----------------------------------------------------------------------//
// Copyright (C) 1994, Virtual World Entertainments, All Rights reserved //
// PROPRIETARY AND CONFIDENTIAL                                          //
//=======================================================================//

#include <munga.hpp>
#pragma hdrstop

#if !defined(LINE_HPP)
#	include <line.hpp>
#endif

#if !defined(PLANE_HPP)
#	include <plane.hpp>
#endif

//
//###########################################################################
//###########################################################################
//
Line&
	Line::operator=(const Vector3D &vector)
{
	Check_Pointer(this);
   Check(&vector);
//
// Make sure length of vector is non-zero
//
	length = vector.Length();
	Verify(length);
//
// Normalize the vector and put it into the line
//
	direction.x = vector.x/length;
	direction.y = vector.y/length;
	direction.z = vector.z/length;
	return *this;
}

//
//###########################################################################
//###########################################################################
//
Line&
	Line::operator=(const Point3D &point)
{
	Check_Pointer(this);
	Check(&point);
//
// Copy the point over into the line.
//
	origin.x = point.x;
	origin.y = point.y;
	origin.z = point.z;
	return *this;
}

Scalar
	Line::DistanceTo(
		const Plane &plane,
		Scalar *product
	) const
{
	*product = direction * plane.normal;
	if (Small_Enough(*product))
	{
		Check_Fpu();
		return -1.0f;
	}
	Scalar result = -plane.DistanceTo(origin) / *product;
	Check_Fpu();
	return result;
}

Scalar
	Line::DistanceTo(
		const Sphere &,//sphere,
		Scalar *//penetration
	) const
{
	return -1.0f;  // HACK
}