refactor: separate traffic and bikeshare components

src/layers/bikeshare/policy.js

@@ -0,0 +1,85 @@
+import * as Cesium from 'cesium';
+
+export const BIKESHARE_SELECTED_OVERLAY_SOURCE_ID = 'bikeshare-selected';
+
+export const BIKESHARE_SELECTED_OVERLAY_SOURCE_OPTIONS = Object.freeze({
+  cohortLimit: 1,
+  collisionCapacity: 0,
+  moving: false,
+});
+
+// --- Activation / display thresholds ---
+/** Altitude (m) at which bikeshare layer becomes eligible for display. */
+
+export const ACTIVATION_ALTITUDE_M = 50000;
+
+/** Hysteresis enter threshold — layer activates when camera drops below this. */
+
+export const ACTIVATION_ENTER_ALTITUDE_M = ACTIVATION_ALTITUDE_M - 2000;
+
+/** Hysteresis exit threshold — layer deactivates when camera rises above this. */
+
+export const ACTIVATION_EXIT_ALTITUDE_M = ACTIVATION_ALTITUDE_M + 2000;
+
+/** Debounce interval (ms) for camera-change proximity checks. */
+
+export const CAMERA_DEBOUNCE_MS = 340;
+
+/** Default radius (km) for determining whether a city is in camera range. */
+
+export const CITY_RANGE_BASE_KM = 100;
+
+/** Polling interval (ms) for refreshing station status data. */
+
+export const STATUS_POLL_MS = 60000;
+
+// --- Point rendering constants ---
+/** Minimum rendered point size in pixels. */
+
+export const POINT_SIZE_MIN = 4;
+
+/** Maximum rendered point size in pixels. */
+
+export const POINT_SIZE_MAX = 12;
+
+/** Fallback station capacity when real data is unavailable. */
+
+export const DEFAULT_CAPACITY = 15;
+
+/** Vertical offset (m) above terrain for station points. */
+
+export const POINT_HEIGHT_OFFSET_M = 2.0;
+
+/** Hard cap on total rendered station points across all cities. */
+
+export const MAX_TOTAL_POINTS = 8000;
+
+// --- Availability color palette ---
+/** Station has >60% bikes available. */
+
+export const COLOR_GREEN =
+  Cesium.Color.fromCssColorString('#00ff88').withAlpha(0.95);
+
+/** Station has 30-60% bikes available. */
+
+export const COLOR_YELLOW =
+  Cesium.Color.fromCssColorString('#ffaa00').withAlpha(0.94);
+
+/** Station has <30% bikes available. */
+
+export const COLOR_RED =
+  Cesium.Color.fromCssColorString('#ff4444').withAlpha(0.94);
+
+/** No status data available for station. */
+
+export const COLOR_NEUTRAL =
+  Cesium.Color.fromCssColorString('#91a4b4').withAlpha(0.62);
+
+/** Station is offline (not installed, not renting, or not returning). */
+
+export const COLOR_MUTED =
+  Cesium.Color.fromCssColorString('#687581').withAlpha(0.48);
+
+/** Outline color for all station points. */
+
+export const COLOR_OUTLINE = Cesium.Color.BLACK.withAlpha(0.25);