serialize method
Serialize to a geojson features collection
Implementation
String serialize() {
final buffer = StringBuffer()
..write('{"type": "FeatureCollection", ' +
(name == null ? '' : '"name": "$name", '))
..write('"features": [');
for (final feat in collection) {
buffer.write(feat.serialize());
if (feat != collection.last) {
buffer.write(',');
}
}
buffer.write("]}");
return buffer.toString();
}