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标记便签在地平线附近渐变淡出，修复拖拽闪烁

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fukunee
2026-09-19 13:27:59 +08:00
parent b33ffd3b2d
commit dddf622d95
1 changed files with 10 additions and 3 deletions
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src/scene/CesiumGlobe.js
+10 -3
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@@ -321,12 +321,19 @@ export class CesiumGlobe {
const win = Cesium.SceneTransforms.worldToWindowCoordinates(scene, m.position); const win = Cesium.SceneTransforms.worldToWindowCoordinates(scene, m.position);
if (!win) { el.style.display = 'none'; continue; } if (!win) { el.style.display = 'none'; continue; }
// 背面（远半球）隐藏：dot(P, C) <= |P|² 时为背对地球 // 前/后半球判断 + 地平线附近渐变淡出（固定 ~3° 渐变带，避免拖拽时闪烁/突隐）
const dotPC = Cesium.Cartesian3.dot(m.position, camera.positionWC); const dotPC = Cesium.Cartesian3.dot(m.position, camera.positionWC);
const r2 = Cesium.Cartesian3.magnitudeSquared(m.position); const pMag = Math.sqrt(Cesium.Cartesian3.magnitudeSquared(m.position));
if (dotPC <= r2) { el.style.display = 'none'; continue; } const cMag = Cesium.Cartesian3.magnitude(camera.positionWC);
const cosPhi = dotPC / (pMag * cMag);
const phi = Math.acos(Math.max(-1, Math.min(1, cosPhi)));
const phiHorizon = Math.acos(Math.max(-1, Math.min(1, pMag / cMag)));
const margin = phiHorizon - phi; // > 0 为前半球
if (margin <= 0) { el.style.display = 'none'; continue; }
const opacity = Math.min(1, margin / 0.05); // 0.05 rad ≈ 3°
el.style.display = 'block'; el.style.display = 'block';
el.style.opacity = String(opacity);
el.style.left = `${win.x}px`; el.style.left = `${win.x}px`;
el.style.top = `${win.y}px`; el.style.top = `${win.y}px`;
} }