lw_seg_interact()

static int lw_seg_interact ( const POINT2D *  p1, const POINT2D *  p2, const POINT2D *  q1, const POINT2D *  q2  )

static

Definition at line 336 of file lwalgorithm.c.

References FP_GT, FP_LT, FP_MAX, FP_MIN, LW_FALSE, LW_TRUE, POINT2D::x, and POINT2D::y.

Referenced by lw_segment_intersects().

{
        double minq=FP_MIN(q1->x,q2->x);
        double maxq=FP_MAX(q1->x,q2->x);
        double minp=FP_MIN(p1->x,p2->x);
        double maxp=FP_MAX(p1->x,p2->x);

        if (FP_GT(minp,maxq) || FP_LT(maxp,minq))
                return LW_FALSE;

        minq=FP_MIN(q1->y,q2->y);
        maxq=FP_MAX(q1->y,q2->y);
        minp=FP_MIN(p1->y,p2->y);
        maxp=FP_MAX(p1->y,p2->y);

        if (FP_GT(minp,maxq) || FP_LT(maxp,minq))
                return LW_FALSE;

        return LW_TRUE;
}

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