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Add option to fetch feature centroid #12

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merged 1 commit into from Sep 4, 2017
Merged

Add option to fetch feature centroid #12

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16 changes: 16 additions & 0 deletions services/features.js
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Expand Up @@ -64,18 +64,33 @@ function parseBoundingBox(bbox_geo_json) {
];
}

function parseCentroid(centroid_geo_json) {
const feature = JSON.parse(centroid_geo_json);
const coords = feature.coordinates;
if (feature.type !== 'Point' || coords.length !== 2) {
return null;
}

const x = coords[0];
const y = coords[1];

return [x, y];
}

function rowToFeature(row, columns) {
if (!row) return;

row['createdAt'] = row['created_at'];
row['updatedAt'] = row['updated_at'];
if (row['hull_geo_json']) row['hull'] = JSON.parse(row['hull_geo_json']);
if (row['bbox_geo_json']) row['bbox'] = parseBoundingBox(row['bbox_geo_json']);
if (row['centroid_geo_json']) row['centroid'] = parseCentroid(row['centroid_geo_json']);

delete row['created_at'];
delete row['updated_at'];
delete row['hull_geo_json'];
delete row['bbox_geo_json'];
delete row['centroid_geo_json'];

return row;
}
Expand All @@ -99,6 +114,7 @@ function buildQueryColumns(query) {
let includeArray = query.include.split(',');

if (includeArray.indexOf('bbox') !== -1) queryColumns += ',ST_AsGeoJSON(ST_Envelope(hull)) as bbox_geo_json';
if (includeArray.indexOf('centroid') !== -1) queryColumns += ',ST_AsGeoJSON(ST_Centroid(hull)) as centroid_geo_json';
if (includeArray.indexOf('hull') !== -1) queryColumns += ',ST_AsGeoJSON(hull) as hull_geo_json';
if (includeArray.indexOf('properties') !== -1) queryColumns += ',properties';
}
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