右键环视改为手动绕点击点旋转，精确限制 ±40°/±20°，松开归位
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+91
-42
@@ -26,6 +26,11 @@ const IMAGERY_URL =
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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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@@ -212,7 +217,6 @@ export class CesiumGlobe {
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Cesium.CameraEventType.PINCH,
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];
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controller.tiltEventTypes = [
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Cesium.CameraEventType.RIGHT_DRAG, // 传统右键：以点击处为球心倾斜视角
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Cesium.CameraEventType.PINCH,
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{
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eventType: Cesium.CameraEventType.LEFT_DRAG,
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@@ -226,7 +230,7 @@ export class CesiumGlobe {
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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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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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@@ -255,7 +259,7 @@ export class CesiumGlobe {
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this._buildMarkers();
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this._setupPick();
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this._setupRightRestore();
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this._setupLookAround();
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this._loadBoundaries();
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this._buildCityLabels();
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@@ -356,65 +360,110 @@ export class CesiumGlobe {
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viewer.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
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}
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// 右键操作（原生 tilt）松开后自动归位 + 拖动角度限制（左右旋转 ±40°，上下倾角 ±20°）
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_setupRightRestore() {
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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._rightRestore = null;
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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(() => {
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this._rightRestore = {
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handler.setInputAction((movement) => {
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const pivot =
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scene.pickPosition(movement.position) ||
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camera.pickEllipsoid(movement.position, 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
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if (Cesium.Cartesian3.magnitudeSquared(eastAxis) < 1e-12) {
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eastAxis.x = 1;
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eastAxis.y = 0;
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eastAxis.z = 0; // 极点退化兜底
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} else {
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Cesium.Cartesian3.normalize(eastAxis, eastAxis);
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}
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this._lookState = {
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pivot: Cesium.Cartesian3.clone(pivot),
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startOffset: Cesium.Cartesian3.clone(offset),
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upAxis: Cesium.Cartesian3.clone(upAxis),
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eastAxis: Cesium.Cartesian3.clone(eastAxis),
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position: Cesium.Cartesian3.clone(camera.position),
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direction: Cesium.Cartesian3.clone(camera.direction),
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up: Cesium.Cartesian3.clone(camera.up),
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heading: camera.heading,
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pitch: camera.pitch,
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azimuth: 0,
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elevation: 0,
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lastX: movement.position.x,
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lastY: movement.position.y,
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};
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}, Cesium.ScreenSpaceEventType.RIGHT_DOWN);
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handler.setInputAction((movement) => {
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if (!this._lookState) return;
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const s = this._lookState;
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const dx = movement.endPosition.x - s.lastX;
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const dy = movement.endPosition.y - s.lastY;
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s.lastX = movement.endPosition.x;
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s.lastY = movement.endPosition.y;
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s.azimuth = Cesium.Math.clamp(s.azimuth + dx * LOOK_RATE, -MAX_LOOK_ROT, MAX_LOOK_ROT);
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s.elevation = Cesium.Math.clamp(s.elevation + dy * LOOK_RATE, -MAX_LOOK_TILT, MAX_LOOK_TILT);
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this._orbitCamera(s);
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}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
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handler.setInputAction(() => {
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if (!this._rightRestore) return;
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const s = this._rightRestore;
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this._rightRestore = null;
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if (!this._lookState) return;
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const s = this._lookState;
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this._lookState = null;
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camera.setView({
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destination: s.position,
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orientation: { direction: s.direction, up: s.up },
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});
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}, Cesium.ScreenSpaceEventType.RIGHT_UP);
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this._rightRestoreHandler = handler;
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this.viewer.scene.postUpdate.addEventListener(() => this._clampLookAngles());
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this._lookHandler = handler;
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}
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// 右键拖拽期间，限制相对起始朝向的旋转/倾角
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_clampLookAngles() {
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if (!this._rightRestore) return;
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// 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
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_orbitCamera(s) {
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const camera = this.viewer.camera;
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const s = this._rightRestore;
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const MAX_ROT = (40 * Math.PI) / 180;
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const MAX_TILT = (20 * Math.PI) / 180;
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let heading = camera.heading;
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let dh = heading - s.heading;
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while (dh > Math.PI) dh -= 2 * Math.PI;
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while (dh < -Math.PI) dh += 2 * Math.PI;
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const rot = Math.max(-MAX_ROT, Math.min(MAX_ROT, dh));
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const pitch = camera.pitch;
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const dp = pitch - s.pitch;
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const tilt = Math.max(-MAX_TILT, Math.min(MAX_TILT, dp));
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if (rot !== dh || tilt !== dp) {
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camera.setView({
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destination: camera.position,
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orientation: {
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heading: s.heading + rot,
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pitch: s.pitch + tilt,
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roll: camera.roll,
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},
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});
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}
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const sc = this._orbitScratch;
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Cesium.Quaternion.fromAxisAngle(s.upAxis, s.azimuth, sc.qAz);
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Cesium.Quaternion.fromAxisAngle(s.eastAxis, s.elevation, sc.qEl);
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Cesium.Quaternion.multiply(sc.qEl, sc.qAz, sc.q);
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Cesium.Matrix3.fromQuaternion(sc.q, sc.rotMat);
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Cesium.Matrix3.multiplyByVector(sc.rotMat, s.startOffset, sc.newOffset);
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Cesium.Cartesian3.add(s.pivot, sc.newOffset, sc.newPos);
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const dir = Cesium.Cartesian3.normalize(
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Cesium.Cartesian3.subtract(s.pivot, sc.newPos, sc.dir),
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sc.dir,
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);
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const z = dir.z;
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sc.upProj.x = -dir.x * z;
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sc.upProj.y = -dir.y * z;
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sc.upProj.z = 1 - z * z;
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Cesium.Cartesian3.normalize(sc.upProj, sc.upProj);
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camera.setView({
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destination: Cesium.Cartesian3.clone(sc.newPos),
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orientation: {
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direction: Cesium.Cartesian3.clone(dir),
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up: Cesium.Cartesian3.clone(sc.upProj),
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},
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});
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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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