laTriangle3.h

/*

Jump'n'Run Engine
http://www.atanaslaskov.com/jnr/

BSD LICENSE
Copyright (c) 2007-2013, Atanas Laskov
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ATANAS LASKOV BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/
#ifndef M_TRIANGLE3_H
#define M_TRIANGLE3_H



//

class laTriangle3
{
public:

    laPoint3 p[3];  
    laPlane3 pn;    

    //CBox box;     // bounding box

    // Constructors and destructor
    //
    laTriangle3() {}

    laTriangle3(laPoint3 aa, laPoint3 ab, laPoint3 ac){
        setVertices(aa,ab,ac);
    }

    void setVertices(laPoint3 &a, laPoint3 &b, laPoint3 &c){
        p[0]=a; p[1]=b; p[2]=c;
        updatePlane();
        //updateBB();
    }

    virtual ~laTriangle3() {}

    // Precompute parameters
    //
    void updatePlane(){
        pn.build(p[0], p[1], p[2]);
    }

    //void updateBB();

    void getPerimeterLines(laLine3 *ar){
        ar[0].build_2pt(p[0], p[1]);
        ar[1].build_2pt(p[1], p[2]);
        ar[2].build_2pt(p[2], p[0]);
    }

    // Find a point on the perimeter of the triangle,
    // nearest to the specified point
    //laPoint3 projectOnPerimeter(laPoint3 p);

    // Check if a point is inside the folume defined by the 3 planes,
    // originating at the edges of the triangle
    BOOL isInsideVolume(laPoint3 &pt);

    // Collisiton detection and repsonse
    //
    // t - triangle to collide with
    // vt - velocity; outputs modified velocity
    // return value - modofied velocity after collision detection and response
    //
    laPoint3 collide(laTriangle3 &t, laPoint3 &vt);

    // ?
    void wrapPoint(laPoint3 &p);

    //laPoint3 GetSideDistance(laPoint3 &p, unsigned nside, double &dv);
    //void BuildWarpedRect(laTriangle3 *arRect, laPoint3 &ptPivot, double dwSideLen);
    //void Save(ofstream &f);
    //bool InsideBox(CBox &b);
    //void Validate();

};
#endif