lwcompound_add_lwgeom()

int lwcompound_add_lwgeom ( LWCOMPOUND *  comp, LWGEOM *  geom  )

extern

Add a component, allocating extra space if necessary.

The compoundcurve takes owership of the passed geometry.

Definition at line 88 of file lwcompound.c.

{
        LWCOLLECTION *col = (LWCOLLECTION*)comp;
 
        /* Empty things can't continuously join up with other things */
        if ( lwgeom_is_empty(geom) )
        {
                LWDEBUG(4, "Got an empty component for a compound curve!");
                return LW_FAILURE;
        }
 
        if( col->ngeoms > 0 )
        {
                POINT4D last, first;
                /* First point of the component we are adding */
                LWLINE *newline = (LWLINE*)geom;
                /* Last point of the previous component */
                LWLINE *prevline = (LWLINE*)(col->geoms[col->ngeoms-1]);
 
                getPoint4d_p(newline->points, 0, &first);
                getPoint4d_p(prevline->points, prevline->points->npoints-1, &last);
 
                if ( !(FP_EQUALS(first.x,last.x) && FP_EQUALS(first.y,last.y)) )
                {
                        LWDEBUG(4, "Components don't join up end-to-end!");
                        LWDEBUGF(4, "first pt (%g %g %g %g) last pt (%g %g %g %g)", first.x, first.y, first.z, first.m, last.x, last.y, last.z, last.m);
                        return LW_FAILURE;
                }
        }
 
        col = lwcollection_add_lwgeom(col, geom);
        return LW_SUCCESS;
}

References FP_EQUALS, LWCOLLECTION::geoms, getPoint4d_p(), LW_FAILURE, LW_SUCCESS, lwcollection_add_lwgeom(), LWDEBUG, LWDEBUGF, lwgeom_is_empty(), POINT4D::m, LWCOLLECTION::ngeoms, POINTARRAY::npoints, LWLINE::points, POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by lwcompound_construct_from_lwline(), and wkt_parser_compound_add_geom().

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