static const LWGEOM*
lwgeom_subgeom(const LWGEOM* g, int n)
{
const LWCOLLECTION* c = lwgeom_as_lwcollection(g);
if ( c ) return lwcollection_getsubgeom((LWCOLLECTION*)c, n);
else return g;
}
/**
* Serializes a LWGEOM to a char*. This is a helper function that partially
* writes the appropriate draw, stroke, and fill commands used to generate an
* SVG image using ImageMagick's "convert" command.
* @param output a char reference to write the LWGEOM to
* @param lwgeom a reference to a LWGEOM
* @return the numbers of character written to *output
*/
static size_t
drawGeometry(char *output, LWGEOM *lwgeom, LAYERSTYLE *styles )
{
char *ptr = output;
int i;
int type = lwgeom_getType(lwgeom->type);
switch (type)
{
case POINTTYPE:
ptr += drawPoint(ptr, (LWPOINT*)lwgeom, styles );
break;
case LINETYPE:
ptr += drawLineString(ptr, (LWLINE*)lwgeom, styles );
break;
case POLYGONTYPE:
ptr += drawPolygon(ptr, (LWPOLY*)lwgeom, styles );
break;
case MULTIPOINTTYPE:
case MULTILINETYPE:
case MULTIPOLYGONTYPE:
case COLLECTIONTYPE:
for (i=0; i<((LWCOLLECTION*)lwgeom)->ngeoms; i++)
{
ptr += drawGeometry( ptr, lwcollection_getsubgeom ((LWCOLLECTION*)lwgeom, i), styles );
}
break;
}
return (ptr - output);
}
