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import reverse from "./reverse.js";
import transform from "./transform.js";
export default function(topology, o) {
if (typeof o === "string") o = topology.objects[o];
return o.type === "GeometryCollection"
? {type: "FeatureCollection", features: o.geometries.map(function(o) { return feature(topology, o); })}
: feature(topology, o);
}
function feature(topology, o) {
var id = o.id,
bbox = o.bbox,
properties = o.properties == null ? {} : o.properties,
geometry = object(topology, o);
return id == null && bbox == null ? {type: "Feature", properties: properties, geometry: geometry}
: bbox == null ? {type: "Feature", id: id, properties: properties, geometry: geometry}
: {type: "Feature", id: id, bbox: bbox, properties: properties, geometry: geometry};
}
export function object(topology, o) {
var transformPoint = transform(topology.transform),
arcs = topology.arcs;
function arc(i, points) {
if (points.length) points.pop();
for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length; k < n; ++k) {
points.push(transformPoint(a[k], k));
}
if (i < 0) reverse(points, n);
}
function point(p) {
return transformPoint(p);
}
function line(arcs) {
var points = [];
for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points);
if (points.length < 2) points.push(points[0]); // This should never happen per the specification.
return points;
}
function ring(arcs) {
var points = line(arcs);
while (points.length < 4) points.push(points[0]); // This may happen if an arc has only two points.
return points;
}
function polygon(arcs) {
return arcs.map(ring);
}
function geometry(o) {
var type = o.type, coordinates;
switch (type) {
case "GeometryCollection": return {type: type, geometries: o.geometries.map(geometry)};
case "Point": coordinates = point(o.coordinates); break;
case "MultiPoint": coordinates = o.coordinates.map(point); break;
case "LineString": coordinates = line(o.arcs); break;
case "MultiLineString": coordinates = o.arcs.map(line); break;
case "Polygon": coordinates = polygon(o.arcs); break;
case "MultiPolygon": coordinates = o.arcs.map(polygon); break;
default: return null;
}
return {type: type, coordinates: coordinates};
}
return geometry(o);
}
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