656 lines
24 KiB
JavaScript
656 lines
24 KiB
JavaScript
import { ENTRIES } from '../data/entries.js';
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// Cesium 懒加载：脚本首次进入“地理”视图时才加载；用 Proxy 惰性访问 window.Cesium，
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// 使下方 50 余处 Cesium.xxx 引用无需逐个改动。
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const Cesium = new Proxy({}, {
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get(_t, prop) { return window.Cesium[prop]; },
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});
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const CESIUM_BASE = '/cesium';
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function loadCesium() {
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return new Promise((resolve, reject) => {
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if (window.Cesium) return resolve();
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window.CESIUM_BASE_URL = CESIUM_BASE;
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const s = document.createElement('script');
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s.src = `${CESIUM_BASE}/Cesium.js`;
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s.onload = () => resolve();
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s.onerror = () => reject(new Error('Cesium 脚本加载失败'));
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document.head.appendChild(s);
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});
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}
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// 免费、无需 Ion 令牌的影像与地形源
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const IMAGERY_URL =
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'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}';
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const TERRAIN_URL =
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'https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer';
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// 右键环视角度限制与灵敏度
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const MAX_LOOK_ROT = (40 * Math.PI) / 180; // 左右旋转 ±40°
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const MAX_LOOK_TILT = (20 * Math.PI) / 180; // 上下倾角 ±20°
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const LOOK_RATE = Math.PI / 720; // 每像素约 0.25°
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// 计算多边形集合的球面面积（km²），用于按国土面积分级国家名字号
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function sphericalAreaKm2(polys) {
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let area = 0;
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for (let p = 0; p < polys.length; p++) {
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const rings = polys[p];
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for (let r = 0; r < rings.length; r++) {
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const ring = rings[r];
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let s = 0;
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for (let i = 0; i < ring.length; i++) {
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const [lng1, lat1] = ring[i];
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const [lng2, lat2] = ring[(i + 1) % ring.length];
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let dlng = ((lng2 - lng1) * Math.PI) / 180;
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while (dlng > Math.PI) dlng -= 2 * Math.PI;
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while (dlng < -Math.PI) dlng += 2 * Math.PI;
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const f1 = (lat1 * Math.PI) / 180;
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const f2 = (lat2 * Math.PI) / 180;
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s += dlng * (2 + Math.sin(f1) + Math.sin(f2));
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}
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const ringArea = Math.abs(s) / 2;
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area += (r === 0 ? 1 : -1) * ringArea;
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}
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}
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const R = 6371; // km
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return area * R * R;
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}
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// 生成便签 canvas：黄底圆角 + 左侧箭头 + 黑色加粗文字（整张图，箭头尖端指向坐标）
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// 选中态：先描粗边再填充，得到一条干净的 2px 外描边（四周预留 B 的 padding 防止裁切）
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function makeStickyNote(text, fontSize, selected = false) {
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const padX = 8, padY = 5, radius = 7, arrowW = 10, arrowH = 14, S = 2, B = 2; // S: 2x 超采样，B: 边框预留
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const font = `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`;
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const m = document.createElement('canvas');
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const mctx = m.getContext('2d');
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mctx.font = font;
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const textW = mctx.measureText(text).width;
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const bodyW = Math.max(1, Math.ceil(textW + padX * 2));
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const w = arrowW + bodyW;
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const h = Math.ceil(fontSize + padY * 2);
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const cw = w + B * 2;
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const ch = h + B * 2;
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const c = document.createElement('canvas');
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c.width = cw * S;
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c.height = ch * S;
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const ctx = c.getContext('2d');
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ctx.scale(S, S);
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const ox = B, oy = B; // 形状整体内缩 B，给黑边留空间
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// 箭头 + 圆角矩形一体化路径（箭头尖端在 (ox, oy + h/2)，指向坐标）
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ctx.beginPath();
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ctx.moveTo(ox, oy + h / 2);
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ctx.lineTo(ox + arrowW, oy + h / 2 - arrowH / 2);
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ctx.lineTo(ox + arrowW, oy + radius);
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ctx.arcTo(ox + arrowW, oy, ox + arrowW + radius, oy, radius);
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ctx.lineTo(ox + w - radius, oy);
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ctx.arcTo(ox + w, oy, ox + w, oy + radius, radius);
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ctx.lineTo(ox + w, oy + h - radius);
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ctx.arcTo(ox + w, oy + h, ox + w - radius, oy + h, radius);
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ctx.lineTo(ox + arrowW + radius, oy + h);
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ctx.arcTo(ox + arrowW, oy + h, ox + arrowW, oy + h - radius, radius);
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ctx.lineTo(ox + arrowW, oy + h / 2 + arrowH / 2);
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ctx.closePath();
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if (selected) {
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// 先描粗边，再填充盖住内侧一半 → 外露 2px 干净黑边
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ctx.strokeStyle = '#14100d';
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ctx.lineWidth = B * 2; // 4px，外露 2px
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ctx.lineJoin = 'round';
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ctx.stroke();
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} else {
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// 非选中：柔和的投影
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ctx.shadowColor = 'rgba(0, 0, 0, 0.20)';
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ctx.shadowBlur = 5;
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ctx.shadowOffsetY = 2;
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}
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ctx.fillStyle = '#e0c46a';
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ctx.fill();
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// 黑色加粗文字
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ctx.fillStyle = '#14100d';
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ctx.font = font;
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ctx.textBaseline = 'middle';
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ctx.textAlign = 'center';
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ctx.fillText(text, ox + arrowW + bodyW / 2, oy + h / 2 + 1);
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return { canvas: c, scale: 1 / S, width: cw, height: ch, tipX: B, tipY: B + h / 2 };
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}
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export class CesiumGlobe {
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constructor({ onPick } = {}) {
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this.onPick = onPick;
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this.viewer = null;
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this.markers = [];
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this.selected = -1;
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this._created = false;
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this._visible = false;
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this._pendingData = 2; // 国家边界 + 城市数据
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this.ready = new Promise((resolve) => { this._resolveReady = resolve; });
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this.viewerReady = new Promise((resolve) => { this._resolveViewerReady = resolve; });
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}
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async ensureCreated() {
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if (this._created) return;
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this._created = true;
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try {
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await loadCesium();
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} catch (err) {
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this._created = false; // 失败可重试
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console.warn('[CesiumGlobe] Cesium 脚本加载失败：', err);
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return;
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}
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// 调整实体渲染顺序：先渲染标签（城市/国家名），再渲染 Billboard（标记便签），
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// 让词条标记始终显示在城市/国家名的上层。
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Cesium.DataSourceDisplay.defaultVisualizersCallback = function (
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scene,
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entityCluster,
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dataSource,
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) {
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const entities = dataSource.entities;
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return [
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new Cesium.LabelVisualizer(entityCluster, entities),
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new Cesium.BillboardVisualizer(entityCluster, entities),
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new Cesium.GeometryVisualizer(
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scene,
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entities,
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dataSource._primitives,
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dataSource._groundPrimitives,
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),
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new Cesium.ModelVisualizer(scene, entities),
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new Cesium.Cesium3DTilesetVisualizer(scene, entities),
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new Cesium.PointVisualizer(entityCluster, entities),
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new Cesium.PathVisualizer(scene, entities),
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new Cesium.PolylineVisualizer(
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scene,
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entities,
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dataSource._primitives,
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dataSource._groundPrimitives,
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),
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];
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};
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const container = document.getElementById('cesium-container');
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this.viewer = new Cesium.Viewer(container, {
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animation: false,
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timeline: false,
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geocoder: false,
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homeButton: false,
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sceneModePicker: false,
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baseLayerPicker: false,
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navigationHelpButton: false,
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fullscreenButton: false,
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infoBox: false,
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selectionIndicator: false,
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baseLayer: false,
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requestRenderMode: true,
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});
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const viewer = this.viewer;
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const scene = viewer.scene;
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// 贴合暗色主题
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scene.backgroundColor = Cesium.Color.fromCssColorString('#14100d');
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scene.skyAtmosphere.show = false;
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scene.skyBox.show = false;
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scene.sun.show = false;
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scene.moon.show = false;
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scene.globe.enableLighting = false;
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scene.globe.showGroundAtmosphere = false;
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scene.globe.baseColor = Cesium.Color.fromCssColorString('#d9e6f0'); // 冰盖浅色：影像/地形未覆盖的南北极区域显示为冰盖，而非黑洞
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// 相机交互：限制滚轮缩放范围，避免过近/过远
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const controller = scene.screenSpaceCameraController;
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controller.enableCollisionDetection = true; // 必须开启：缩放距离限制在关闭时会被忽略
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controller.minimumZoomDistance = 10000; // 最近约 10 km（区域尺度）
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controller.maximumZoomDistance = 8e6; // 最远约 8000 km
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// 限制鼠标按钮：只保留左键旋转 + 滚轮缩放；禁用中键倾斜、右键缩放
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controller.rotateEventTypes = Cesium.CameraEventType.LEFT_DRAG;
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controller.zoomEventTypes = [
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Cesium.CameraEventType.WHEEL,
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Cesium.CameraEventType.PINCH,
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];
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controller.tiltEventTypes = [
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Cesium.CameraEventType.PINCH,
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{
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eventType: Cesium.CameraEventType.LEFT_DRAG,
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modifier: Cesium.KeyboardEventModifier.CTRL,
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},
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];
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// 阻止右键弹出浏览器菜单
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scene.canvas.addEventListener('contextmenu', (e) => e.preventDefault());
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// 精细化渲染：质量与性能的平衡
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scene.globe.maximumScreenSpaceError = 2.0; // 默认细分，最省性能
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scene.globe.tileCacheSize = 600; // 更大的瓦片缓存，减少细节刷新
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scene.fxaa = true; // 开启抗锯齿
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viewer.resolutionScale = 1.0; // 关闭超采样（DPR 已提供足够分辨率），省填充率
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scene.maximumRenderTimeChange = Infinity; // 配合 requestRenderMode：静止时停止重绘，大幅省电省帧
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// 卫星影像
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const imagery = new Cesium.UrlTemplateImageryProvider({
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url: IMAGERY_URL,
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credit: 'Imagery © Esri, Maxar, Earthstar Geographics',
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maximumLevel: 19,
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});
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const imageryLayer = new Cesium.ImageryLayer(imagery, {
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// 卫星影像不覆盖极区（约 ±85° 外返回黑块），限制范围让极区用冰盖底色
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rectangle: Cesium.Rectangle.fromDegrees(-180, -85, 180, 85),
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});
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viewer.imageryLayers.add(imageryLayer);
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// 真实地形（Esri World Elevation 3D，免费无 token；失败则保持默认椭球）
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const terrain = new Cesium.Terrain(
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Cesium.ArcGISTiledElevationTerrainProvider.fromUrl(TERRAIN_URL),
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);
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terrain.errorEvent.addEventListener((err) => {
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console.warn('[CesiumGlobe] 地形加载失败，使用椭球：', err);
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});
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scene.setTerrain(terrain);
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viewer.clock.shouldAnimate = false;
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this._buildMarkers();
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this._setupPick();
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this._setupLookAround();
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this._loadBoundaries();
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this._buildCityLabels();
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viewer.camera.setView({
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destination: Cesium.Cartesian3.fromDegrees(35, 12, 7.2e6),
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});
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// 创建完成：同步当前选中/可见/相机状态（首次进入时这些调用可能因 viewer 未建而跳过）
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this.setSelected(this.selected);
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this.setVisible(this._visible);
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this.resize();
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this.flyToEntry(this.selected);
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// 地球已就绪（影像/地形/城市数据继续后台加载），通知 App 隐藏加载遮罩
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if (this._resolveViewerReady) {
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this._resolveViewerReady();
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this._resolveViewerReady = null;
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}
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}
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_buildMarkers() {
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ENTRIES.forEach((entry, i) => {
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const position = Cesium.Cartesian3.fromDegrees(entry.lng, entry.lat);
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const noteNormal = makeStickyNote(entry.name, 16, false);
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const noteSelected = makeStickyNote(entry.name, 16, true);
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this.markers.push({
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position,
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r2: Cesium.Cartesian3.magnitudeSquared(position),
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noteNormal,
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noteSelected,
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index: i,
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});
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});
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this._initMarkerLayer();
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}
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// 便签用 DOM 覆盖层渲染：始终在城市/国家名上层，且缩放到最近也不会漂移
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_initMarkerLayer() {
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const container = document.getElementById('cesium-container');
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this._markerLayer = document.createElement('div');
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this._markerLayer.id = 'marker-layer';
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container.appendChild(this._markerLayer);
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for (const m of this.markers) {
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const el = document.createElement('div');
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el.className = 'marker-note';
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el.style.width = `${m.noteNormal.width}px`;
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el.style.height = `${m.noteNormal.height}px`;
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el.dataset.index = m.index;
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m.el = el;
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m.tipX = m.noteNormal.tipX; // 箭头尖相对元素左上角的偏移
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m.tipY = m.noteNormal.tipY;
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m.normalUrl = m.noteNormal.canvas.toDataURL();
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m.selectedUrl = m.noteSelected.canvas.toDataURL();
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el.style.backgroundImage = `url("${m.normalUrl}")`;
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el.addEventListener('click', (e) => {
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e.stopPropagation();
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this.onPick?.(m.index);
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});
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this._markerLayer.appendChild(el);
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}
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// 用 postUpdate（每帧都触发，即使 requestRenderMode 下不真正渲染）更新便签位置，
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// 避免拖拽时 postRender 不触发导致的闪烁/消失。
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this.viewer.scene.postUpdate.addEventListener(() => this._updateMarkerLayer());
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}
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// 每帧更新便签屏幕位置（相机移动/缩放/飞行时跟随）
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_updateMarkerLayer() {
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const scene = this.viewer.scene;
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const camera = scene.camera;
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const camPos = camera.positionWC; // 每帧只取一次相机位置
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for (const m of this.markers) {
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const el = m.el;
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if (!el) continue;
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const win = Cesium.SceneTransforms.worldToWindowCoordinates(scene, m.position);
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if (!win) { el.style.display = 'none'; continue; }
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// 前/后半球：dot(P, C) > |P|²；地平线附近用 frontness 渐变淡出（避免 acos）
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const frontness = Cesium.Cartesian3.dot(m.position, camPos) - m.r2;
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if (frontness <= 0) { el.style.display = 'none'; continue; }
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const opacity = Math.min(1, frontness / (m.r2 * 0.02));
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el.style.display = 'block';
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el.style.opacity = String(opacity);
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el.style.left = `${win.x - m.tipX}px`;
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el.style.top = `${win.y - m.tipY}px`;
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}
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}
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_setupPick() {
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const viewer = this.viewer;
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// 移除 Viewer 默认的单击选中与双击“追踪实体”：否则双击后会锁定相机（定住）
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// 标记便签已改为 DOM 覆盖层，点击由 DOM 元素自行处理
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viewer.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
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viewer.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
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}
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// 右键环视：以点击处为球心，左右旋转 ±40°、上下倾角 ±20°，松开自动归位。
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// 不用原生 tilt（RIGHT_DRAG）：原生 tilt 会绕点击点做轨道移动，heading/pitch
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// 是相对“不断移动的相机位置”计算的，无法干净地限制成 40°/20°。
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_setupLookAround() {
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const scene = this.viewer.scene;
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const camera = this.viewer.camera;
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const handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
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this._lookState = null;
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this._orbitScratch = {
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offset: new Cesium.Cartesian3(),
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upAxis: new Cesium.Cartesian3(),
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eastAxis: new Cesium.Cartesian3(),
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qAz: new Cesium.Quaternion(),
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qEl: new Cesium.Quaternion(),
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q: new Cesium.Quaternion(),
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rotMat: new Cesium.Matrix3(),
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newOffset: new Cesium.Cartesian3(),
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newPos: new Cesium.Cartesian3(),
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dir: new Cesium.Cartesian3(),
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upProj: new Cesium.Cartesian3(),
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};
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handler.setInputAction((movement) => {
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// 旋转中心 = 相机当前注视的屏幕中心点（与原生 tilt 一致），
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// 而不是点击点：用点击点会导致一拖动就“瞬移”到点击处。
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const canvas = scene.canvas;
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const center = Cesium.Cartesian2.fromElements(
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canvas.clientWidth / 2,
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canvas.clientHeight / 2,
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);
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const pivot = camera.pickEllipsoid(center, scene.globe.ellipsoid);
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if (!Cesium.defined(pivot)) return;
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const sc = this._orbitScratch;
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const offset = Cesium.Cartesian3.subtract(camera.position, pivot, sc.offset);
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const upAxis = Cesium.Cartesian3.normalize(pivot, sc.upAxis); // 绕它转 = 左右旋转
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const eastAxis = Cesium.Cartesian3.cross(Cesium.Cartesian3.UNIT_Z, pivot, sc.eastAxis); // 绕它转 = 上下倾角
|
||
if (Cesium.Cartesian3.magnitudeSquared(eastAxis) < 1e-12) {
|
||
eastAxis.x = 1;
|
||
eastAxis.y = 0;
|
||
eastAxis.z = 0; // 极点退化兜底
|
||
} else {
|
||
Cesium.Cartesian3.normalize(eastAxis, eastAxis);
|
||
}
|
||
this._lookState = {
|
||
pivot: Cesium.Cartesian3.clone(pivot),
|
||
startOffset: Cesium.Cartesian3.clone(offset),
|
||
upAxis: Cesium.Cartesian3.clone(upAxis),
|
||
eastAxis: Cesium.Cartesian3.clone(eastAxis),
|
||
position: Cesium.Cartesian3.clone(camera.position),
|
||
direction: Cesium.Cartesian3.clone(camera.direction),
|
||
up: Cesium.Cartesian3.clone(camera.up),
|
||
azimuth: 0,
|
||
elevation: 0,
|
||
lastX: movement.position.x,
|
||
lastY: movement.position.y,
|
||
};
|
||
}, Cesium.ScreenSpaceEventType.RIGHT_DOWN);
|
||
|
||
handler.setInputAction((movement) => {
|
||
if (!this._lookState) return;
|
||
const s = this._lookState;
|
||
const dx = movement.endPosition.x - s.lastX;
|
||
const dy = movement.endPosition.y - s.lastY;
|
||
s.lastX = movement.endPosition.x;
|
||
s.lastY = movement.endPosition.y;
|
||
s.azimuth = Cesium.Math.clamp(s.azimuth + dx * LOOK_RATE, -MAX_LOOK_ROT, MAX_LOOK_ROT);
|
||
s.elevation = Cesium.Math.clamp(s.elevation + dy * LOOK_RATE, -MAX_LOOK_TILT, MAX_LOOK_TILT);
|
||
this._orbitCamera(s);
|
||
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
|
||
|
||
handler.setInputAction(() => {
|
||
if (!this._lookState) return;
|
||
const s = this._lookState;
|
||
this._lookState = null;
|
||
camera.setView({
|
||
destination: s.position,
|
||
orientation: { direction: s.direction, up: s.up },
|
||
});
|
||
}, Cesium.ScreenSpaceEventType.RIGHT_UP);
|
||
|
||
this._lookHandler = handler;
|
||
}
|
||
|
||
// 按累计角度（已限制）把相机绕点击点旋转；始终保持北朝上、看向点击点
|
||
_orbitCamera(s) {
|
||
const camera = this.viewer.camera;
|
||
const sc = this._orbitScratch;
|
||
Cesium.Quaternion.fromAxisAngle(s.upAxis, s.azimuth, sc.qAz);
|
||
Cesium.Quaternion.fromAxisAngle(s.eastAxis, s.elevation, sc.qEl);
|
||
Cesium.Quaternion.multiply(sc.qEl, sc.qAz, sc.q);
|
||
Cesium.Matrix3.fromQuaternion(sc.q, sc.rotMat);
|
||
Cesium.Matrix3.multiplyByVector(sc.rotMat, s.startOffset, sc.newOffset);
|
||
Cesium.Cartesian3.add(s.pivot, sc.newOffset, sc.newPos);
|
||
const dir = Cesium.Cartesian3.normalize(
|
||
Cesium.Cartesian3.subtract(s.pivot, sc.newPos, sc.dir),
|
||
sc.dir,
|
||
);
|
||
const z = dir.z;
|
||
sc.upProj.x = -dir.x * z;
|
||
sc.upProj.y = -dir.y * z;
|
||
sc.upProj.z = 1 - z * z;
|
||
Cesium.Cartesian3.normalize(sc.upProj, sc.upProj);
|
||
camera.setView({
|
||
destination: Cesium.Cartesian3.clone(sc.newPos),
|
||
orientation: {
|
||
direction: Cesium.Cartesian3.clone(dir),
|
||
up: Cesium.Cartesian3.clone(sc.upProj),
|
||
},
|
||
});
|
||
}
|
||
|
||
// 相机平滑飞至某个标记上空并居中：回到与初始一致的高度与北朝上方向，左键拖拽手感不变
|
||
flyToEntry(index) {
|
||
const entry = ENTRIES[index];
|
||
if (!entry || !this.viewer) return;
|
||
const now = Date.now();
|
||
if (this._lastFly && now - this._lastFly < 400) return; // 双击/连点去抖，避免重复飞
|
||
this._lastFly = now;
|
||
const camera = this.viewer.camera;
|
||
const height = camera.positionCartographic.height; // 保持当前缩放，平移过去
|
||
camera.flyTo({
|
||
destination: Cesium.Cartesian3.fromDegrees(entry.lng, entry.lat, height),
|
||
orientation: {
|
||
heading: 0,
|
||
pitch: Cesium.Math.toRadians(-90),
|
||
roll: 0,
|
||
},
|
||
duration: 1.2,
|
||
});
|
||
}
|
||
|
||
// 加载行政区划（国家边界，自然地球 110m）：把多边形轮廓转成贴合地形的金色细线 + 国家名标签
|
||
async _loadBoundaries() {
|
||
try {
|
||
const res = await fetch('/world-countries.geojson');
|
||
const geojson = await res.json();
|
||
const textGold = Cesium.Color.fromCssColorString('#e0c46a');
|
||
const black = Cesium.Color.fromCssColorString('#14100d');
|
||
|
||
const lines = [];
|
||
for (const feature of geojson.features || []) {
|
||
const props = feature.properties || {};
|
||
const geom = feature.geometry;
|
||
const isPoly = geom && (geom.type === 'Polygon' || geom.type === 'MultiPolygon');
|
||
const polys = isPoly ? (geom.type === 'MultiPolygon' ? geom.coordinates : [geom.coordinates]) : [];
|
||
const areaKm2 = isPoly ? sphericalAreaKm2(polys) : 0;
|
||
|
||
// 国家名（优先中文），落在 NATURAL EARTH 提供的标注点上，字号按国土面积分级
|
||
let cname = props.NAME_ZH || props.NAME;
|
||
if (cname === '中华民国') cname = '中国台湾';
|
||
if (cname && props.LABEL_X != null && props.LABEL_Y != null) {
|
||
const fontSize = areaKm2 > 5e6 ? 30 : areaKm2 > 1.5e6 ? 19 : areaKm2 > 3e5 ? 15 : 12;
|
||
this.viewer.entities.add({
|
||
position: Cesium.Cartesian3.fromDegrees(props.LABEL_X, props.LABEL_Y),
|
||
label: {
|
||
text: cname,
|
||
font: `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`,
|
||
fillColor: black,
|
||
style: Cesium.LabelStyle.FILL,
|
||
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
|
||
distanceDisplayCondition: new Cesium.DistanceDisplayCondition(1e6, 1e7),
|
||
scaleByDistance: new Cesium.NearFarScalar(1e4, 20 / 15, 6e6, 1.0),
|
||
translucencyByDistance: new Cesium.NearFarScalar(9e6, 1.0, 1e7, 0.0),
|
||
},
|
||
});
|
||
}
|
||
|
||
if (!isPoly) continue;
|
||
for (const poly of polys) {
|
||
for (const ring of poly) {
|
||
if (ring.length < 2) continue;
|
||
const flat = [];
|
||
for (const [lng, lat] of ring) flat.push(lng, lat);
|
||
const positions = Cesium.Cartesian3.fromDegreesArray(flat);
|
||
// 行政区划：一根黑线
|
||
lines.push(new Cesium.GeometryInstance({ geometry: new Cesium.GroundPolylineGeometry({ positions, width: 2.6 }) }));
|
||
}
|
||
}
|
||
}
|
||
|
||
if (lines.length) {
|
||
this.viewer.scene.groundPrimitives.add(
|
||
new Cesium.GroundPolylinePrimitive({
|
||
geometryInstances: lines,
|
||
appearance: new Cesium.PolylineMaterialAppearance({
|
||
material: Cesium.Material.fromType('Color', { color: black }),
|
||
}),
|
||
}),
|
||
);
|
||
}
|
||
} catch (err) {
|
||
console.warn('[CesiumGlobe] 行政区划加载失败：', err);
|
||
} finally {
|
||
this._dataReady();
|
||
}
|
||
}
|
||
|
||
// 全部城市：Natural Earth 10m 人口稠密点（7342 个），中文名直接用数据自带的 name_zh
|
||
async _buildCityLabels() {
|
||
const scene = this.viewer.scene;
|
||
const textGold = Cesium.Color.fromCssColorString('#e0c46a');
|
||
const black = Cesium.Color.fromCssColorString('#14100d');
|
||
const ddc = new Cesium.DistanceDisplayCondition(0, 4e6);
|
||
const tdc = new Cesium.NearFarScalar(2e6, 1.0, 4e6, 0.0);
|
||
|
||
let cities = [];
|
||
try {
|
||
const res = await fetch('/world-cities-zh.json');
|
||
cities = await res.json();
|
||
} catch (err) {
|
||
console.warn('[CesiumGlobe] 城市数据加载失败：', err);
|
||
cities = [];
|
||
}
|
||
|
||
// 用 primitive 集合替代 7342 个 entity，大幅降低 Cesium 实体系统开销
|
||
const points = new Cesium.PointPrimitiveCollection();
|
||
const labels = new Cesium.LabelCollection({ scene });
|
||
scene.primitives.add(points);
|
||
scene.primitives.add(labels);
|
||
|
||
for (const c of cities) {
|
||
const position = Cesium.Cartesian3.fromDegrees(c.lng, c.lat);
|
||
points.add({
|
||
position,
|
||
pixelSize: 3,
|
||
color: textGold,
|
||
outlineColor: black,
|
||
outlineWidth: 1,
|
||
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
|
||
distanceDisplayCondition: ddc,
|
||
translucencyByDistance: tdc,
|
||
});
|
||
labels.add({
|
||
position,
|
||
text: c.name,
|
||
font: 'bold 14px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif',
|
||
fillColor: black,
|
||
style: Cesium.LabelStyle.FILL,
|
||
horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
|
||
verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
|
||
pixelOffset: new Cesium.Cartesian2(0, -6),
|
||
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
|
||
distanceDisplayCondition: ddc,
|
||
translucencyByDistance: tdc,
|
||
});
|
||
}
|
||
this._dataReady();
|
||
}
|
||
|
||
_dataReady() {
|
||
this._pendingData--;
|
||
if (this._pendingData <= 0 && this._resolveReady) {
|
||
this._resolveReady();
|
||
this._resolveReady = null;
|
||
}
|
||
}
|
||
|
||
setSelected(index) {
|
||
this.selected = index;
|
||
if (!this.viewer) return;
|
||
this.markers.forEach((m) => {
|
||
const on = m.index === index;
|
||
if (m.el) m.el.style.backgroundImage = `url("${on ? m.selectedUrl : m.normalUrl}")`;
|
||
});
|
||
}
|
||
|
||
setVisible(visible) {
|
||
this._visible = visible;
|
||
if (visible && this.viewer) this.viewer.scene.requestRender();
|
||
}
|
||
|
||
// 等待当前视图的影像/地形瓦片加载完成（超时兜底），用于切换时“一起出现”
|
||
waitUntilViewReady(timeout = 4000) {
|
||
return new Promise((resolve) => {
|
||
const globe = this.viewer.scene.globe;
|
||
let done = false;
|
||
const finish = () => {
|
||
if (done) return;
|
||
done = true;
|
||
globe.tileLoadProgressEvent.removeEventListener(onProgress);
|
||
resolve();
|
||
};
|
||
const onProgress = (remaining) => { if (remaining <= 0) finish(); };
|
||
globe.tileLoadProgressEvent.addEventListener(onProgress);
|
||
if (globe.tilesLoaded) finish();
|
||
setTimeout(finish, timeout);
|
||
});
|
||
}
|
||
|
||
resize() {
|
||
if (this.viewer) this.viewer.resize();
|
||
}
|
||
}
|