lineseg.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
/***********************************************************************************************
 ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               ***
 ***********************************************************************************************
 *                                                                                             *
 *                 Project Name : WWMath                                                       *
 *                                                                                             *
 *                     $Archive:: /Commando/Code/wwmath/lineseg.h                             $*
 *                                                                                             *
 *                       Author:: Greg_h                                                       *
 *                                                                                             *
 *                     $Modtime:: 3/16/00 3:16p                                               $*
 *                                                                                             *
 *                    $Revision:: 21                                                          $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------*
 * Functions:                                                                                  *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
 
#if defined(_MSC_VER)
#pragma once
#endif
 
#ifndef LINESEG_H
#define LINESEG_H
 
#include "always.h"
#include "vector3.h"
#include "castres.h"
 
class TriClass;
class AABoxClass;
class OBBoxClass;
class PlaneClass;
class SphereClass;
class Matrix3D;
 
 
class LineSegClass
{
 
public:
 
    LineSegClass(void) { }
    LineSegClass(const Vector3 & p0,const Vector3 & p1) : P0(p0), P1(p1) { recalculate(); }
    LineSegClass(const LineSegClass & that,const Matrix3D & tm) { Set(that,tm); }
 
    void                    Set(const Vector3 & p0,const Vector3 & p1) { P0 = p0; P1 = p1; recalculate(); }
    void                    Set(const LineSegClass & that,const Matrix3D & tm);
    void                    Set_Random(const Vector3 & min,const Vector3 & max);
 
    const Vector3 &  Get_P0() const { return P0; }               // start point
    const Vector3 &  Get_P1() const { return P1; }               // end point
    const Vector3 &  Get_DP() const { return DP; }               // difference of the two points
    const Vector3 &  Get_Dir() const { return Dir; }           // normalized direction.
    float                   Get_Length() const { return Length; }   // length of the segment
 
    void                    Compute_Point(float t,Vector3 * set) const  { Vector3::Add(P0,t*DP,set); }
    
    Vector3              Find_Point_Closest_To(const Vector3 &pos) const;
    bool                    Find_Intersection (const LineSegClass &other_line, Vector3 *p1, float *fraction1, Vector3 *p2, float *fraction2) const;
 
protected:
 
    void                    recalculate(void) { DP = P1 - P0; Dir = DP; Dir.Normalize(); Length = DP.Length(); }
 
    Vector3              P0;       // start point
    Vector3              P1;       // end point
    Vector3              DP;       // difference of the two points
    Vector3              Dir;     // normalized direction.
    float                   Length;   // length of the segment
};
 
 
#endif