llline.h

Go to the documentation of this file.

// llline.h
#ifndef LL_LINE_H
#define LL_LINE_H

#include <iostream>
#include "stdtypes.h"
#include "v3math.h"

const F32 DEFAULT_INTERSECTION_ERROR = 0.000001f;

class LLLine
{
public:
        LLLine();
        LLLine( const LLVector3& first_point, const LLVector3& second_point );
        virtual ~LLLine() {};

        void setPointDirection( const LLVector3& first_point, const LLVector3& second_point );
        void setPoints( const LLVector3& first_point, const LLVector3& second_point );

        bool intersects( const LLVector3& point, F32 radius = DEFAULT_INTERSECTION_ERROR ) const;

        // returns the point on this line that is closest to some_point
        LLVector3 nearestApproach( const LLVector3& some_point ) const;

        // returns the point on this line that is closest to other_line
        LLVector3 nearestApproach( const LLLine& other_line ) const;

        friend std::ostream& operator<<( std::ostream& output_stream, const LLLine& line );

        // returns 'true' if this line intersects the plane
        // on success stores the intersection point in 'result'
        bool intersectsPlane( LLVector3& result, const LLLine& plane ) const;

        // returns 'true' if planes intersect, and stores the result 
        // the second and third arguments are treated as planes
        // where mPoint is on the plane and mDirection is the normal
        // result.mPoint will be the intersection line's closest approach 
        // to first_plane.mPoint
        static bool getIntersectionBetweenTwoPlanes( LLLine& result, const LLLine& first_plane, const LLLine& second_plane );

        const LLVector3& getPoint() const { return mPoint; }
        const LLVector3& getDirection() const { return mDirection; }

protected:
        // these are protected because some code assumes that the normal is 
        // always correct and properly normalized.
        LLVector3 mPoint;
        LLVector3 mDirection;
};


#endif

---