[Tile-serving] [osm2pgsql] Add area reprojection facility (#454)

[Paul Norman]

> +    reprojection = r;
> +}
> +
> +/**
> + * Computes area of given polygonal geometry.
> + * \return the area in projected units, or in EPSG 3857 if area reprojection is enabled
> + */
> +double geometry_builder::getArea(const geos::geom::Geometry *geom) const
> +{
> +    // reprojection is not necessary, or has not been asked for.
> +    if (!reprojection) {
> +        return geom->getArea();
> +    }
> +
> +    // MultiPolygon - return sum of individual areas
> +    if (const geos::geom::MultiPolygon* multi = dynamic_cast<const geos::geom::MultiPolygon *>(geom)) {

this is the multipolygon case, https://github.com/openstreetmap/osm2pgsql/pull/454/files#diff-853d1c6f0a63324f82abcb98373e8bc5 only contains a simple closed way.


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/454/files#r41618755
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