@giro3d/giro3d/entities/tiles/PlanarTileGeometryBuilder.js

A JS/WebGL framework for 3D geospatial data visualization

/*
 * Copyright (c) 2015-2018, IGN France.
 * Copyright (c) 2018-2026, Giro3D team.
 * SPDX-License-Identifier: MIT
 */

import { Vector2 } from 'three';
import PlanarTileGeometry from './PlanarTileGeometry';
export function selectBestSubdivisions(extent, maxAspectRatio) {
  const dims = extent.dimensions();
  const ratio = dims.x / dims.y;
  let x = 1;
  let y = 1;
  if (ratio > 1) {
    // Our extent is an horizontal rectangle
    x = Math.min(Math.round(ratio), maxAspectRatio);
  } else if (ratio < 1) {
    // Our extent is an vertical rectangle
    y = Math.min(Math.round(1 / ratio), maxAspectRatio);
  }
  return new Vector2(x, y);
}

/**
 * Builds tile in a planar coordinate system.
 */
export default class PlanarTileGeometryBuilder {
  constructor(params) {
    this.extent = params.extent;
    this._rootTileMatrix = selectBestSubdivisions(params.extent, params.maxAspectRatio);
    this._segments = params.segments;
    this._skirtDepth = params.skirtDepth;
  }
  set segments(v) {
    this._segments = v;
  }
  get rootTileMatrix() {
    return this._rootTileMatrix;
  }
  build(params) {
    return new PlanarTileGeometry({
      extent: params.extent,
      segments: this._segments,
      skirtDepth: this._skirtDepth
    });
  }
}