all files / mapbox-gl-draw/src/lib/ move_features.js

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const constrainFeatureMovement = require('./constrain_feature_movement');
const Constants = require('../constants');
 
module.exports = function(features, delta) {
  const constrainedDelta = constrainFeatureMovement(features.map(feature => feature.toGeoJSON()), delta);
 
  features.forEach(feature => {
    const currentCoordinates = feature.getCoordinates();
 
    const moveCoordinate = (coord) => {
      const point = {
        lng: coord[0] + constrainedDelta.lng,
        lat: coord[1] + constrainedDelta.lat
      };
      return [point.lng, point.lat];
    };
    const moveRing = (ring) => ring.map(coord => moveCoordinate(coord));
    const moveMultiPolygon = (multi) => multi.map(ring => moveRing(ring));
 
    let nextCoordinates;
    if (feature.type === Constants.geojsonTypes.POINT) {
      nextCoordinates = moveCoordinate(currentCoordinates);
    } else if (feature.type === Constants.geojsonTypes.LINE_STRING || feature.type === Constants.geojsonTypes.MULTI_POINT) {
      nextCoordinates = currentCoordinates.map(moveCoordinate);
    } else if (feature.type === Constants.geojsonTypes.POLYGON || feature.type === Constants.geojsonTypes.MULTI_LINE_STRING) {
      nextCoordinates = currentCoordinates.map(moveRing);
    } else if (feature.type === Constants.geojsonTypes.MULTI_POLYGON) E{
      nextCoordinates = currentCoordinates.map(moveMultiPolygon);
    }
 
    feature.incomingCoords(nextCoordinates);
  });
};