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Douglas Bett
Douglas Bett

Reputation: 137

how to create spatial buffers in flutter using flutter_map

How can one create a Polygon buffer, let's say 20 m around a specific point?

I am using the flutter_map package. Is there anyone who's got any ideas on how to implement this?

Upvotes: 0

Views: 633

Answers (1)

Douglas Bett
Douglas Bett

Reputation: 137

So there's this package called dart_jts pub.dev which is a port of the Java Topology Suite, which can do exactly this. The issue I have is how to specify the distance in metres or kilometres.

import 'package:dart_jts/dart_jts.dart' show GeometryFactory,Coordinate,Polygon,BufferOp;

final geometryFactory = GeometryFactory.defaultPrecision();

final point = geometryFactory.createPoint(
  Coordinate(
    longitude,
    latitude,
  ),
);
final distance = 0.0002;
// final buffer = point.buffer(distance);
final buffer = BufferOp.bufferOp3(point, distance, 6);
return buffer as Polygon;

Upvotes: 0

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