Nothing
knitr::opts_chunk$set( collapse = TRUE, comment = "#>" )
The gdalheaders API uses the following (pseudo-code) schemes for feature access.
The different feature loops, see https://github.com/dis-organization/dirigible/issues/5
Get all the feature thingys.
double nFeature = gdalheaders::force_layer_feature_count(poLayer); List/Vector out (nFeature); double ii = 0; while( (poFeature = poLayer->GetNextFeature()) != NULL ) { out[ii] = poFeature-><something>; OGRFeature::DestroyFeature(poFeature); ii++; }
Get a subset of feature thingys i:j - their positional index.
For c(0, 0)
get the first feature, for c(0, n - 1)
get all of them. For c(0, -1)
that is a special case, there are no features.
ListVector out(ij[1] - ij[0] + 1); double cnt = 0; double ii = 0; while( (poFeature = poLayer->GetNextFeature()) != NULL ) { if (ii == ij[0] || (ii > ij[0] && ii <= ij[1])) { out[cnt] = poFeature-><something>; cnt++; } ii++; OGRFeature::DestroyFeature(poFeature); }
Get a subset of feature things, arbitrary i (in order) - their positional index
ListVector out(ia.length()); double ii = 0; double cnt = 0; while( (poFeature = poLayer->GetNextFeature()) != NULL ) { if (ii == ia[cnt]) { out[cnt] = poFeature-><something>; cnt++; } ii++; OGRFeature::DestroyFeature(poFeature); } ``` ## FA Get a subset of feature thingys *arbitrary FID* (order irrelevant) - their FID *unique names* ```C++ List out(fa.length()); for (double ii = 0; ii < fa.length(); ii++) { GIntBig feature_id = (GIntBig)fa[ii]; poFeature = poLayer->GetFeature(feature_id);
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