_lwt_describe_intersection_point()

static bool _lwt_describe_intersection_point ( const GEOSGeometry *  g1, const GEOSGeometry *  g2, char *  buf, size_t  bufsize  )

static

Definition at line 47 of file lwgeom_topo.c.

{
        unsigned int n = 0;
        POINT2D pt;
        GEOSGeometry *isect;
        GEOSGeometry *surface_pt;
        const GEOSCoordSequence *seq;
 
        isect = GEOSIntersection(g1, g2);
        if (!isect)
                return false;
 
        surface_pt = GEOSPointOnSurface(isect);
        GEOSGeom_destroy(isect);
        if (!surface_pt)
                return false;
 
        seq = GEOSGeom_getCoordSeq(surface_pt);
        if (!seq)
        {
                GEOSGeom_destroy(surface_pt);
                return false;
        }
 
        if (!GEOSCoordSeq_getSize(seq, &n) || !n)
        {
                GEOSGeom_destroy(surface_pt);
                return false;
        }
 
        if (!GEOSCoordSeq_getX(seq, 0, &pt.x) || !GEOSCoordSeq_getY(seq, 0, &pt.y))
        {
                GEOSGeom_destroy(surface_pt);
                return false;
        }
 
        GEOSGeom_destroy(surface_pt);
        snprintf(buf, bufsize, " at POINT(%.15g %.15g)", pt.x, pt.y);
        return true;
}

References POINT2D::x, and POINT2D::y.

Referenced by _lwt_CheckEdgeCrossing().

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