int proj_context_errno (PJ_CONTEXT *ctx) {
/******************************************************************************
Read an error directly from a context, without going through a PJ
belonging to that context.
******************************************************************************/
if (0==ctx)
ctx = pj_get_default_ctx();
return pj_ctx_get_errno (ctx);
}
static paralist *append_defaults_to_paralist (PJ_CONTEXT *ctx, paralist *start, char *key) {
paralist *defaults, *last = 0;
char keystring[ID_TAG_MAX + 20];
paralist *next, *proj;
int err;
if (0==start)
return 0;
if (strlen(key) > ID_TAG_MAX)
return 0;
/* Set defaults, unless inhibited (either explicitly through a "no_defs" token */
/* or implicitly, because we are initializing a pipeline) */
if (pj_param_exists (start, "no_defs"))
return start;
proj = pj_param_exists (start, "proj");
if (0==proj)
return start;
if (strlen (proj->param) < 6)
return start;
if (0==strcmp ("pipeline", proj->param + 5))
return start;
err = pj_ctx_get_errno (ctx);
pj_ctx_set_errno (ctx, 0);
/* Locate end of start-list */
for (last = start; last->next; last = last->next);
strcpy (keystring, "proj_def.dat:");
strcat (keystring, key);
defaults = get_init (ctx, keystring);
/* Defaults are optional - so we don't care if we cannot open the file */
pj_ctx_set_errno (ctx, err);
if (!defaults)
return last;
/* Loop over all default items */
for (next = defaults; next; next = next->next) {
/* Don't override existing parameter value of same name */
if (pj_param_exists (start, next->param))
continue;
/* Don't default ellipse if datum, ellps or any ellipsoid information is set */
if (0==strncmp(next->param,"ellps=", 6)) {
if (pj_param_exists (start, "datum")) continue;
if (pj_param_exists (start, "ellps")) continue;
if (pj_param_exists (start, "a")) continue;
if (pj_param_exists (start, "b")) continue;
if (pj_param_exists (start, "rf")) continue;
if (pj_param_exists (start, "f")) continue;
if (pj_param_exists (start, "e")) continue;
if (pj_param_exists (start, "es")) continue;
}
/* If we're here, it's OK to append the current default item */
last = last->next = pj_mkparam(next->param);
}
last->next = 0;
pj_dealloc_params (ctx, defaults, 0);
return last;
}
int proj_errno (const PJ *P) {
/******************************************************************************
Read an error level from the context of a PJ.
******************************************************************************/
return pj_ctx_get_errno (pj_get_ctx ((PJ *) P));
}
int pj_transform( PJ *srcdefn, PJ *dstdefn, long point_count, int point_offset,
double *x, double *y, double *z )
{
long i;
int err;
srcdefn->ctx->last_errno = 0;
dstdefn->ctx->last_errno = 0;
if( point_offset == 0 )
point_offset = 1;
/* -------------------------------------------------------------------- */
/* Transform unusual input coordinate axis orientation to */
/* standard form if needed. */
/* -------------------------------------------------------------------- */
if( strcmp(srcdefn->axis,"enu") != 0 )
{
int err;
err = pj_adjust_axis( srcdefn->ctx, srcdefn->axis,
0, point_count, point_offset, x, y, z );
if( err != 0 )
return err;
}
/* -------------------------------------------------------------------- */
/* Transform Z to meters if it isn't already. */
/* -------------------------------------------------------------------- */
if( srcdefn->vto_meter != 1.0 && z != NULL )
{
for( i = 0; i < point_count; i++ )
z[point_offset*i] *= srcdefn->vto_meter;
}
/* -------------------------------------------------------------------- */
/* Transform geocentric source coordinates to lat/long. */
/* -------------------------------------------------------------------- */
if( srcdefn->is_geocent )
{
if( z == NULL )
{
pj_ctx_set_errno( pj_get_ctx(srcdefn), PJD_ERR_GEOCENTRIC);
return PJD_ERR_GEOCENTRIC;
}
if( srcdefn->to_meter != 1.0 )
{
for( i = 0; i < point_count; i++ )
{
if( x[point_offset*i] != HUGE_VAL )
{
x[point_offset*i] *= srcdefn->to_meter;
y[point_offset*i] *= srcdefn->to_meter;
}
}
}
err = pj_geocentric_to_geodetic( srcdefn->a_orig, srcdefn->es_orig,
point_count, point_offset,
x, y, z );
if( err != 0 )
return err;
}
/* -------------------------------------------------------------------- */
/* Transform source points to lat/long, if they aren't */
/* already. */
/* -------------------------------------------------------------------- */
else if( !srcdefn->is_latlong )
{
if( srcdefn->inv == NULL )
{
pj_ctx_set_errno( pj_get_ctx(srcdefn), -17 );
pj_log( pj_get_ctx(srcdefn), PJ_LOG_ERROR,
"pj_transform(): source projection not invertable" );
return -17;
}
for( i = 0; i < point_count; i++ )
{
XY projected_loc;
LP geodetic_loc;
projected_loc.u = x[point_offset*i];
projected_loc.v = y[point_offset*i];
if( projected_loc.u == HUGE_VAL )
continue;
geodetic_loc = pj_inv( projected_loc, srcdefn );
if( srcdefn->ctx->last_errno != 0 )
{
if( (srcdefn->ctx->last_errno != 33 /*EDOM*/
&& srcdefn->ctx->last_errno != 34 /*ERANGE*/ )
&& (srcdefn->ctx->last_errno > 0
|| srcdefn->ctx->last_errno < -44 || point_count == 1
|| transient_error[-srcdefn->ctx->last_errno] == 0 ) )
return srcdefn->ctx->last_errno;
else
{
geodetic_loc.u = HUGE_VAL;
geodetic_loc.v = HUGE_VAL;
}
}
x[point_offset*i] = geodetic_loc.u;
y[point_offset*i] = geodetic_loc.v;
}
}
/* -------------------------------------------------------------------- */
/* But if they are already lat long, adjust for the prime */
/* meridian if there is one in effect. */
/* -------------------------------------------------------------------- */
if( srcdefn->from_greenwich != 0.0 )
{
for( i = 0; i < point_count; i++ )
{
if( x[point_offset*i] != HUGE_VAL )
x[point_offset*i] += srcdefn->from_greenwich;
}
}
/* -------------------------------------------------------------------- */
/* Do we need to translate from geoid to ellipsoidal vertical */
/* datum? */
/* -------------------------------------------------------------------- */
if( srcdefn->has_geoid_vgrids )
{
if( pj_apply_vgridshift( srcdefn, "sgeoidgrids",
&(srcdefn->vgridlist_geoid),
&(srcdefn->vgridlist_geoid_count),
0, point_count, point_offset, x, y, z ) != 0 )
return pj_ctx_get_errno(srcdefn->ctx);
}
/* -------------------------------------------------------------------- */
/* Convert datums if needed, and possible. */
/* -------------------------------------------------------------------- */
if( pj_datum_transform( srcdefn, dstdefn, point_count, point_offset,
x, y, z ) != 0 )
{
if( srcdefn->ctx->last_errno != 0 )
return srcdefn->ctx->last_errno;
else
return dstdefn->ctx->last_errno;
}
/* -------------------------------------------------------------------- */
/* Do we need to translate from geoid to ellipsoidal vertical */
/* datum? */
/* -------------------------------------------------------------------- */
if( dstdefn->has_geoid_vgrids )
{
if( pj_apply_vgridshift( dstdefn, "sgeoidgrids",
&(dstdefn->vgridlist_geoid),
&(dstdefn->vgridlist_geoid_count),
1, point_count, point_offset, x, y, z ) != 0 )
return dstdefn->ctx->last_errno;
}
/* -------------------------------------------------------------------- */
/* But if they are staying lat long, adjust for the prime */
/* meridian if there is one in effect. */
/* -------------------------------------------------------------------- */
if( dstdefn->from_greenwich != 0.0 )
{
for( i = 0; i < point_count; i++ )
{
if( x[point_offset*i] != HUGE_VAL )
x[point_offset*i] -= dstdefn->from_greenwich;
}
}
/* -------------------------------------------------------------------- */
/* Transform destination latlong to geocentric if required. */
/* -------------------------------------------------------------------- */
if( dstdefn->is_geocent )
{
if( z == NULL )
{
pj_ctx_set_errno( dstdefn->ctx, PJD_ERR_GEOCENTRIC );
return PJD_ERR_GEOCENTRIC;
}
pj_geodetic_to_geocentric( dstdefn->a_orig, dstdefn->es_orig,
point_count, point_offset, x, y, z );
if( dstdefn->fr_meter != 1.0 )
{
for( i = 0; i < point_count; i++ )
{
if( x[point_offset*i] != HUGE_VAL )
{
x[point_offset*i] *= dstdefn->fr_meter;
y[point_offset*i] *= dstdefn->fr_meter;
}
}
}
}
/* -------------------------------------------------------------------- */
/* Transform destination points to projection coordinates, if */
/* desired. */
/* -------------------------------------------------------------------- */
else if( !dstdefn->is_latlong )
{
for( i = 0; i < point_count; i++ )
{
XY projected_loc;
LP geodetic_loc;
geodetic_loc.u = x[point_offset*i];
geodetic_loc.v = y[point_offset*i];
if( geodetic_loc.u == HUGE_VAL )
continue;
projected_loc = pj_fwd( geodetic_loc, dstdefn );
if( dstdefn->ctx->last_errno != 0 )
{
if( (dstdefn->ctx->last_errno != 33 /*EDOM*/
&& dstdefn->ctx->last_errno != 34 /*ERANGE*/ )
&& (dstdefn->ctx->last_errno > 0
|| dstdefn->ctx->last_errno < -44 || point_count == 1
|| transient_error[-dstdefn->ctx->last_errno] == 0 ) )
return dstdefn->ctx->last_errno;
else
{
projected_loc.u = HUGE_VAL;
projected_loc.v = HUGE_VAL;
}
}
x[point_offset*i] = projected_loc.u;
y[point_offset*i] = projected_loc.v;
}
}
/* -------------------------------------------------------------------- */
/* If a wrapping center other than 0 is provided, rewrap around */
/* the suggested center (for latlong coordinate systems only). */
/* -------------------------------------------------------------------- */
else if( dstdefn->is_latlong && dstdefn->is_long_wrap_set )
{
for( i = 0; i < point_count; i++ )
{
if( x[point_offset*i] == HUGE_VAL )
continue;
while( x[point_offset*i] < dstdefn->long_wrap_center - PI )
x[point_offset*i] += TWOPI;
while( x[point_offset*i] > dstdefn->long_wrap_center + PI )
x[point_offset*i] -= TWOPI;
}
}
/* -------------------------------------------------------------------- */
/* Transform Z from meters if needed. */
/* -------------------------------------------------------------------- */
if( dstdefn->vto_meter != 1.0 && z != NULL )
{
for( i = 0; i < point_count; i++ )
z[point_offset*i] *= dstdefn->vfr_meter;
}
/* -------------------------------------------------------------------- */
/* Transform normalized axes into unusual output coordinate axis */
/* orientation if needed. */
/* -------------------------------------------------------------------- */
if( strcmp(dstdefn->axis,"enu") != 0 )
{
int err;
err = pj_adjust_axis( dstdefn->ctx, dstdefn->axis,
1, point_count, point_offset, x, y, z );
if( err != 0 )
return err;
}
return 0;
}
