gint16 a_dems_list_get_elev_by_coord ( GList *dems, const VikCoord *coord )
{
static struct UTM utm_tmp;
static struct LatLon ll_tmp;
GList *iter = dems;
VikDEM *dem;
gint elev;
while ( iter ) {
dem = a_dems_get ( (gchar *) iter->data );
if ( dem ) {
if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) {
vik_coord_to_latlon ( coord, &ll_tmp );
ll_tmp.lat *= 3600;
ll_tmp.lon *= 3600;
elev = vik_dem_get_east_north(dem, ll_tmp.lon, ll_tmp.lat);
if ( elev != VIK_DEM_INVALID_ELEVATION )
return elev;
} else if ( dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS ) {
vik_coord_to_utm ( coord, &utm_tmp );
if ( utm_tmp.zone == dem->utm_zone &&
(elev = vik_dem_get_east_north(dem, utm_tmp.easting, utm_tmp.northing)) != VIK_DEM_INVALID_ELEVATION )
return elev;
}
}
iter = iter->next;
}
return VIK_DEM_INVALID_ELEVATION;
}
static void dem_layer_draw ( VikDEMLayer *vdl, VikViewport *vp )
{
GList *dems_iter = vdl->files;
VikDEM *dem;
/* search for SRTM3 90m */
if ( vdl->source == DEM_SOURCE_SRTM )
srtm_draw_existence ( vp );
#ifdef VIK_CONFIG_DEM24K
else if ( vdl->source == DEM_SOURCE_DEM24K )
dem24k_draw_existence ( vp );
#endif
while ( dems_iter ) {
dem = a_dems_get ( (const char *) (dems_iter->data) );
if ( dem )
vik_dem_layer_draw_dem ( vdl, vp, dem );
dems_iter = dems_iter->next;
}
}
