itowns/lib/Layer/InfoLayer.js

A JS/WebGL framework for 3D geospatial data visualization

import { Extent } from '@itowns/geographic';
export default class InfoLayer {
  constructor(layer) {
    this.layer = layer;
  }
  // eslint-disable-next-line
  clear() {}
  // eslint-disable-next-line
  update() {}
}

/**
 * InfoTiledGeometryLayer that provides some states layer informations. These
 * informations are displayed tiles, displayed {@link ColorLayer} and {@link
 * ElevationLayer} and extent of displayed tiles.
 *
 * @class InfoTiledGeometryLayer
 *
 * @property {object} displayed
 * @property {Layer[]} displayed.layers - Displayed {@link ColorLayer} and {@link ElevationLayer}.
 * @property {Extent} displayed.extent - {@link Extent} of displayed tiles.
 * @property {Set} displayed.tiles - Set of displayed tiles.
 */
export class InfoTiledGeometryLayer extends InfoLayer {
  constructor(tiledGeometryLayer) {
    super(tiledGeometryLayer);
    this.displayed = {
      tiles: new Set()
    };
    Object.defineProperty(this.displayed, 'layers', {
      get: () => {
        let layers = [];
        this.displayed.tiles.forEach(tile => {
          const m = tile.material;
          layers = [...new Set([...layers, ...m.colorTileIds.filter(id => m.getColorTile(id)), m.elevationTileId])];
        });
        return this.layer.attachedLayers.filter(l => layers.includes(l.id));
      }
    });
    Object.defineProperty(this.displayed, 'extent', {
      get: () => {
        const extent = new Extent(this.layer.extent.crs, Infinity, -Infinity, Infinity, -Infinity);
        extent.min = +Infinity;
        extent.max = -Infinity;
        this.displayed.tiles.forEach(tile => {
          extent.union(tile.extent);
          extent.min = Math.min(tile.obb.z.min, extent.min);
          extent.max = Math.max(tile.obb.z.max, extent.max);
        });
        return extent;
      }
    });
  }
  clear() {
    this.displayed.tiles.clear();
  }
  update(tile) {
    if (tile.material.visible) {
      this.displayed.tiles.add(tile);
    } else {
      this.displayed.tiles.delete(tile);
    }
  }
}