Method _updateBuildingData

modules/core/Map3dSystem.js:435–491

* _updateBuildingData

(entities)

   * _updateBuildingData
   */
  _updateBuildingData(entities) {
    const context = this.context;
    const editor = context.systems.editor;
    const graph = editor.staging.graph;
    const selectedIDs = context.selectedIDs();

    let buildingFeatures = [];
    for (const entity of entities) {
      const gj = entity.asGeoJSON(graph);
      if (gj.type !== 'Polygon' && gj.type !== 'MultiPolygon') continue;

      // If the building isn't a 'part', check its nodes.
      // If any of THEM have a 'building part' as a way, and if that part is
      // wholly contained in the footprint of this building, then we need to
      // hide this building.
      // Only perform this step if there are relatively few buildings to show,
      // as this is a very expensive algorithm to run
      if (!entity.tags['building:part'] && entities.length < 250) {
        let touchesBuildingPart = false;

        for (let node of entity.nodes) {
          const parents = graph.parentWays(graph.hasEntity(node));
          for (let way of parents) {
            if (way.tags['building:part'] && geomPolygonContainsPolygon(entity.nodes.map(n => graph.hasEntity(n).loc), way.nodes.map(n => graph.hasEntity(n).loc))) {
              touchesBuildingPart = true;
              break;
            }
          }
        }

        if (touchesBuildingPart) {
          continue;
        }
      }

      const newFeature = {
        type: 'Feature',
        properties: {
          extrude: true,
          selected: selectedIDs.includes(entity.id).toString(),
          min_height: entity.tags.min_height ? parseFloat(entity.tags.min_height) : 0,
          height: parseFloat(entity.tags.height || entity.tags['building:levels'] * 3 || 0)
        },
        geometry: gj
      };

      buildingFeatures.push(newFeature);
    }

    const buildingSource = this.maplibre.getSource('osmbuildings');
    if (buildingSource) {
      buildingSource.setData({
        type: 'FeatureCollection',
        features: buildingFeatures
      });
    }
  }