feature.js

import hat from 'hat';
import * as Constants from '../constants.js';

const Feature = function(ctx, geojson) {
  this.ctx = ctx;
  this.properties = geojson.properties || {};
  this.coordinates = geojson.geometry.coordinates;
  this.id = geojson.id || hat();
  this.type = geojson.geometry.type;
};

Feature.prototype.changed = function() {
  this.ctx.store.featureChanged(this.id);
};

Feature.prototype.incomingCoords = function(coords) {
  this.setCoordinates(coords);
};

Feature.prototype.setCoordinates = function(coords) {
  this.coordinates = coords;
  this.changed();
};

Feature.prototype.getCoordinates = function() {
  return JSON.parse(JSON.stringify(this.coordinates));
};

Feature.prototype.setProperty = function(property, value) {
  this.properties[property] = value;
};

Feature.prototype.toGeoJSON = function() {
  return JSON.parse(JSON.stringify({
    id: this.id,
    type: Constants.geojsonTypes.FEATURE,
    properties: this.properties,
    geometry: {
      coordinates: this.getCoordinates(),
      type: this.type
    }
  }));
};

Feature.prototype.internal = function(mode) {
  const properties = {
    id: this.id,
    meta: Constants.meta.FEATURE,
    'meta:type': this.type,
    active: Constants.activeStates.INACTIVE,
    mode
  };

  if (this.ctx.options.userProperties) {
    for (const name in this.properties) {
      properties[`user_${name}`] = this.properties[name];
    }
  }

  return {
    type: Constants.geojsonTypes.FEATURE,
    properties,
    geometry: {
      coordinates: this.getCoordinates(),
      type: this.type
    }
  };
};

export default Feature;