ray.cpp File Reference

#include "ray.h"
#include "../../3d_fastmath.h"
#include <cstdio>
#include <wx/debug.h>
#include <wx/log.h>
#include <cmath>

Go to the source code of this file.

Functions
bool	IntersectSegment (const SFVEC2F &aStartA, const SFVEC2F &aEnd_minus_startA, const SFVEC2F &aStartB, const SFVEC2F &aEnd_minus_startB)

Function Documentation

IntersectSegment()

bool IntersectSegment	(	const SFVEC2F &	aStartA,
		const SFVEC2F &	aEnd_minus_startA,
		const SFVEC2F &	aStartB,
		const SFVEC2F &	aEnd_minus_startB
	)

Definition at line 187 of file ray.cpp.

{
    float rxs = aEnd_minus_startA.x * aEnd_minus_startB.y - aEnd_minus_startA.y *
                aEnd_minus_startB.x;

    if( std::abs( rxs ) >  glm::epsilon<float>() )
    {
        float inv_rxs = 1.0f / rxs;

        SFVEC2F pq = aStartB - aStartA;

        float t = ( pq.x * aEnd_minus_startB.y - pq.y * aEnd_minus_startB.x ) * inv_rxs;

        if( ( t < 0.0f ) || ( t > 1.0f ) )
            return false;

        float u = ( pq.x * aEnd_minus_startA.y - pq.y * aEnd_minus_startA.x ) * inv_rxs;

        if( ( u < 0.0f ) || ( u > 1.0f ) )
            return false;

        return true;
    }

    return false;
}

Referenced by ROUND_SEGMENT_2D::Intersects().