407 lines
15 KiB
JavaScript
407 lines
15 KiB
JavaScript
import * as Cesium from 'cesium';
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import { ENTRIES } from '../data/entries.js';
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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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// 点击标记后飞到的目标高度（米，与初始视图一致，保证左键拖拽始终是“整球旋转”）
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const FLY_TO_HEIGHT = 7.2e6;
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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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function makeStickyNote(text, fontSize, selected = false) {
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const padX = 14, padY = 8, radius = 8, arrowW = 12, arrowH = 16, S = 2; // S: 2x 超采样
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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 c = document.createElement('canvas');
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c.width = w * S;
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c.height = h * S;
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const ctx = c.getContext('2d');
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ctx.scale(S, S);
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// 阴影
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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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// 箭头 + 圆角矩形一体化路径（箭头尖端在左侧 x=0，指向坐标）
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ctx.beginPath();
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ctx.moveTo(0, h / 2); // 箭头尖端
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ctx.lineTo(arrowW, h / 2 - arrowH / 2); // 箭头上沿
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ctx.lineTo(arrowW, radius); // 左边缘上部
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ctx.arcTo(arrowW, 0, arrowW + radius, 0, radius); // 左上圆角
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ctx.lineTo(w - radius, 0); // 上边
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ctx.arcTo(w, 0, w, radius, radius); // 右上圆角
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ctx.lineTo(w, h - radius); // 右边
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ctx.arcTo(w, h, w - radius, h, radius); // 右下圆角
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ctx.lineTo(arrowW + radius, h); // 底边
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ctx.arcTo(arrowW, h, arrowW, h - radius, radius); // 左下圆角
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ctx.lineTo(arrowW, h / 2 + arrowH / 2); // 左边缘下部
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ctx.closePath(); // 闭合回箭头尖端
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ctx.fillStyle = '#FFF9A6';
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ctx.fill();
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// 选中时加黑边
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if (selected) {
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ctx.shadowColor = 'transparent';
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ctx.shadowBlur = 0;
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ctx.shadowOffsetY = 0;
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ctx.strokeStyle = '#14100d';
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ctx.lineWidth = 3;
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ctx.stroke();
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}
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// 黑色加粗文字（无阴影）
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ctx.shadowColor = 'transparent';
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ctx.shadowBlur = 0;
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ctx.shadowOffsetY = 0;
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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, arrowW + bodyW / 2, h / 2 + 1);
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return { canvas: c, scale: 1 / S };
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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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}
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ensureCreated() {
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if (this._created) return;
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this._created = true;
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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('#0a1626');
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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 = false; // 关闭抗锯齿后处理，省一个全屏通道
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viewer.resolutionScale = 1.5; // 1.5 倍超采样，替代 FXAA 提供更锐利的抗锯齿
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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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viewer.imageryLayers.addImageryProvider(imagery);
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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._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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}
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_buildMarkers() {
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const viewer = this.viewer;
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ENTRIES.forEach((entry, i) => {
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// 便签：黄底黑字 + 左侧箭头指向坐标（整张图）
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const noteNormal = makeStickyNote(entry.name, 19, false);
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const noteSelected = makeStickyNote(entry.name, 19, true);
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const entity = viewer.entities.add({
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position: Cesium.Cartesian3.fromDegrees(entry.lng, entry.lat),
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billboard: {
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image: noteNormal.canvas,
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scale: noteNormal.scale,
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horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
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verticalOrigin: Cesium.VerticalOrigin.CENTER,
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pixelOffset: new Cesium.Cartesian2(0, 0),
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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disableDepthTestDistance: Number.POSITIVE_INFINITY,
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distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 1e7),
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},
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});
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entity.entryIndex = i;
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this.markers.push({ entity, noteNormal, noteSelected, index: i });
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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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viewer.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
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viewer.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
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const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
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handler.setInputAction((movement) => {
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const picked = viewer.scene.pick(movement.position);
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if (Cesium.defined(picked) && picked.id && picked.id.entryIndex !== undefined) {
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const index = picked.id.entryIndex;
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this.onPick?.(index);
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this.flyToEntry(index);
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}
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}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
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this._handler = handler;
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}
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// 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
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flyToEntry(index) {
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const entry = ENTRIES[index];
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if (!entry || !this.viewer) return;
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const now = Date.now();
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if (this._lastFly && now - this._lastFly < 400) return; // 双击/连点去抖，避免重复飞
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this._lastFly = now;
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this.viewer.camera.flyTo({
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destination: Cesium.Cartesian3.fromDegrees(entry.lng, entry.lat, FLY_TO_HEIGHT),
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orientation: {
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heading: 0,
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pitch: Cesium.Math.toRadians(-90),
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roll: 0,
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},
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duration: 1.2,
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});
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}
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// 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
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async _loadBoundaries() {
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try {
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const res = await fetch('/world-countries.geojson');
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const geojson = await res.json();
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const textGold = Cesium.Color.fromCssColorString('#e0c46a');
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const black = Cesium.Color.fromCssColorString('#14100d');
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const lines = [];
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for (const feature of geojson.features || []) {
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const props = feature.properties || {};
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const geom = feature.geometry;
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const isPoly = geom && (geom.type === 'Polygon' || geom.type === 'MultiPolygon');
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const polys = isPoly ? (geom.type === 'MultiPolygon' ? geom.coordinates : [geom.coordinates]) : [];
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const areaKm2 = isPoly ? sphericalAreaKm2(polys) : 0;
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// 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
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const cname = props.NAME_ZH || props.NAME;
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if (cname && props.LABEL_X != null && props.LABEL_Y != null) {
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const fontSize = areaKm2 > 5e6 ? 30 : areaKm2 > 1.5e6 ? 19 : areaKm2 > 3e5 ? 15 : 12;
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this.viewer.entities.add({
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position: Cesium.Cartesian3.fromDegrees(props.LABEL_X, props.LABEL_Y),
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label: {
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text: cname,
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font: `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`,
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fillColor: black,
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style: Cesium.LabelStyle.FILL,
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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distanceDisplayCondition: new Cesium.DistanceDisplayCondition(1e6, 1e7),
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scaleByDistance: new Cesium.NearFarScalar(1e4, 20 / 15, 6e6, 1.0),
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translucencyByDistance: new Cesium.NearFarScalar(9e6, 1.0, 1e7, 0.0),
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},
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});
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}
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if (!isPoly) continue;
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for (const poly of polys) {
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for (const ring of poly) {
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if (ring.length < 2) continue;
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const flat = [];
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for (const [lng, lat] of ring) flat.push(lng, lat);
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const positions = Cesium.Cartesian3.fromDegreesArray(flat);
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// 行政区划：一根黑线
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lines.push(new Cesium.GeometryInstance({ geometry: new Cesium.GroundPolylineGeometry({ positions, width: 2.0 }) }));
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}
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}
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}
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if (lines.length) {
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this.viewer.scene.groundPrimitives.add(
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new Cesium.GroundPolylinePrimitive({
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geometryInstances: lines,
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appearance: new Cesium.PolylineMaterialAppearance({
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material: Cesium.Material.fromType('Color', { color: black }),
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}),
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}),
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);
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}
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} catch (err) {
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console.warn('[CesiumGlobe] 行政区划加载失败：', err);
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} finally {
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this._dataReady();
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}
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}
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// 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
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async _buildCityLabels() {
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const viewer = this.viewer;
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const textGold = Cesium.Color.fromCssColorString('#e0c46a');
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const black = Cesium.Color.fromCssColorString('#14100d');
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const ddc = new Cesium.DistanceDisplayCondition(0, 4e6);
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const tdc = new Cesium.NearFarScalar(2e6, 1.0, 4e6, 0.0);
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let cities = [];
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try {
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const res = await fetch('/world-cities-zh.json');
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cities = await res.json();
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} catch (err) {
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console.warn('[CesiumGlobe] 城市数据加载失败：', err);
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cities = [];
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}
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for (const c of cities) {
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viewer.entities.add({
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position: Cesium.Cartesian3.fromDegrees(c.lng, c.lat),
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point: {
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pixelSize: 3,
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color: textGold,
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outlineColor: black,
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outlineWidth: 1,
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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distanceDisplayCondition: ddc,
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translucencyByDistance: tdc,
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},
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label: {
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text: c.name,
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font: 'bold 14px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif',
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fillColor: black,
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style: Cesium.LabelStyle.FILL,
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horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
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verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
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pixelOffset: new Cesium.Cartesian2(0, -6),
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heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
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distanceDisplayCondition: ddc,
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translucencyByDistance: tdc,
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},
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});
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}
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this._dataReady();
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}
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_dataReady() {
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this._pendingData--;
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if (this._pendingData <= 0 && this._resolveReady) {
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this._resolveReady();
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this._resolveReady = null;
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}
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}
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setSelected(index) {
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this.selected = index;
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if (!this.viewer) return;
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this.markers.forEach(({ entity, noteNormal, noteSelected, index: i }) => {
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const on = i === index;
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entity.billboard.image = on ? noteSelected.canvas : noteNormal.canvas; // 选中加黑边
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});
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this.viewer.scene.requestRender();
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}
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setVisible(visible) {
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this._visible = visible;
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if (visible && this.viewer) this.viewer.scene.requestRender();
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}
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resize() {
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if (this.viewer) this.viewer.resize();
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}
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}
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