mirror of
https://github.com/bilawalsidhu/gods-eye-view.git
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84 lines
3.2 KiB
JavaScript
84 lines
3.2 KiB
JavaScript
/**
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* One-click camera transfer for layer-owned world targets.
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*/
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import * as Cesium from 'cesium';
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export const WORLD_FOCUS_REQUEST_EVENT = 'gev:world-request-focus';
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export const WORLD_CLICK_FOCUS_DURATION_SEC = 1.9;
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export const WORLD_FOCUS_FRAMING = Object.freeze({
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vessel: Object.freeze({ radiusM: 150, rangeM: 1200, pitchDeg: -30 }),
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fire: Object.freeze({ radiusM: 400, rangeM: 3000, pitchDeg: -35 }),
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});
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/** Validate a layer-owned focus target before camera policy can release tracking. */
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export function isValidWorldFocusTarget(detail) {
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if (!detail || !WORLD_FOCUS_FRAMING[detail.kind]) return false;
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if (!String(detail.id || '').trim()) return false;
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const { position } = detail;
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if (!position
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|| !Number.isFinite(position.x)
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|| !Number.isFinite(position.y)
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|| !Number.isFinite(position.z)) return false;
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// Vessel and fire targets are surface-anchored Earth positions. Merely
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// finite coordinates near the ECEF origin cannot be flown to, and must be
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// rejected before the camera policy releases a current follow owner.
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const magnitude = Cesium.Cartesian3.magnitude(position);
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return Number.isFinite(magnitude)
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&& magnitude >= Cesium.Ellipsoid.WGS84.minimumRadius * 0.95;
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}
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/** Announce a valid user-click focus request. */
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export function requestWorldFocus(detail, eventTarget = globalThis.window) {
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if (!isValidWorldFocusTarget(detail)) return false;
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if (typeof eventTarget?.dispatchEvent !== 'function') return false;
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eventTarget.dispatchEvent(new CustomEvent(WORLD_FOCUS_REQUEST_EVENT, { detail }));
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return true;
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}
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/** Register one listener and return an idempotent disposer. */
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export function registerWorldFocusRequestListener(eventTarget, listener) {
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if (!eventTarget?.addEventListener || !eventTarget?.removeEventListener
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|| typeof listener !== 'function') return () => {};
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eventTarget.addEventListener(WORLD_FOCUS_REQUEST_EVENT, listener);
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let disposed = false;
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return () => {
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if (disposed) return;
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disposed = true;
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eventTarget.removeEventListener(WORLD_FOCUS_REQUEST_EVENT, listener);
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};
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}
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/** Route a valid request through the UI-owned camera policy. */
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export function routeWorldFocusRequest(event, runExplicitFocus, fly) {
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const detail = event?.detail;
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if (!isValidWorldFocusTarget(detail)) return false;
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if (typeof runExplicitFocus !== 'function' || typeof fly !== 'function') return false;
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return runExplicitFocus(detail, () => fly(detail));
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}
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/** Fly to a world target after ownership has been released. */
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export function flyToWorldTarget(viewer, target = {}) {
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const camera = viewer?.camera;
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const framing = WORLD_FOCUS_FRAMING[target.kind];
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if (!camera || !framing || !isValidWorldFocusTarget(target)) return false;
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const heading = Number.isFinite(camera.heading) ? camera.heading : 0;
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const duration = target.durationSec > 0
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? target.durationSec
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: WORLD_CLICK_FOCUS_DURATION_SEC;
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camera.cancelFlight?.();
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camera.flyToBoundingSphere(
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new Cesium.BoundingSphere(target.position, framing.radiusM),
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{
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offset: new Cesium.HeadingPitchRange(
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heading,
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Cesium.Math.toRadians(framing.pitchDeg),
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framing.rangeM,
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),
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duration,
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easingFunction: Cesium.EasingFunction.CUBIC_IN_OUT,
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},
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);
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return true;
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}
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