getVerticesAt(position, radius, excludeVertexId) {
    let locals = Array();

    for (var i = 0; i < this.graph.vertices.length; i++) {
      let vertex = this.graph.vertices[i];

      if (vertex.id === excludeVertexId || !vertex.positioned) {
        continue;
      }

      let distance = position.distanceSq(vertex.position);

      if (distance <= radius * radius) {
        locals.push(vertex.id);
      }
    }

    return locals;
  }
Returns an array of vertices positioned at a specified location.

@param {Vector2} position The position to search for vertices.
@param {Number} radius The radius within to search.
@param {Number} excludeVertexId A vertex id to be excluded from the search results.
@returns {Number[]} An array containing vertex ids in a given location.