b9fbacade7
- Add isSatelliteFrontFacing() to detect if satellite is on visible side - Filter satellites in hover and click handlers by front-facing check - Apply same logic as cables for consistent back-face culling
670 lines
21 KiB
JavaScript
670 lines
21 KiB
JavaScript
// satellites.js - Satellite visualization module with real SGP4 positions and animations
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import * as THREE from 'three';
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import { twoline2satrec, sgp4, propagate, degreesToRadians, radiansToDegrees, eciToGeodetic } from 'satellite.js';
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import { CONFIG, SATELLITE_CONFIG } from './constants.js';
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let satellitePoints = null;
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let satelliteTrails = null;
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let satelliteData = [];
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let showSatellites = false;
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let showTrails = true;
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let animationTime = 0;
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let selectedSatellite = null;
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let satellitePositions = [];
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let hoverRingSprite = null;
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let lockedRingSprite = null;
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let lockedDotSprite = null;
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export let breathingPhase = 0;
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export function updateBreathingPhase() {
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breathingPhase += SATELLITE_CONFIG.breathingSpeed;
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}
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const SATELLITE_API = SATELLITE_CONFIG.apiPath + '?limit=' + SATELLITE_CONFIG.maxCount;
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const MAX_SATELLITES = SATELLITE_CONFIG.maxCount;
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const TRAIL_LENGTH = SATELLITE_CONFIG.trailLength;
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const DOT_TEXTURE_SIZE = 32;
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function createDotTexture() {
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const canvas = document.createElement('canvas');
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canvas.width = DOT_TEXTURE_SIZE;
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canvas.height = DOT_TEXTURE_SIZE;
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const ctx = canvas.getContext('2d');
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const center = DOT_TEXTURE_SIZE / 2;
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const radius = center - 2;
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const gradient = ctx.createRadialGradient(center, center, 0, center, center, radius);
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gradient.addColorStop(0, 'rgba(255, 255, 255, 1)');
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gradient.addColorStop(0.5, 'rgba(255, 255, 255, 0.8)');
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gradient.addColorStop(1, 'rgba(255, 255, 255, 0)');
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ctx.fillStyle = gradient;
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ctx.beginPath();
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ctx.arc(center, center, radius, 0, Math.PI * 2);
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ctx.fill();
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const texture = new THREE.CanvasTexture(canvas);
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texture.needsUpdate = true;
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return texture;
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}
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function createRingTexture(innerRadius, outerRadius, color = '#ffffff') {
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const size = DOT_TEXTURE_SIZE * 2;
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const canvas = document.createElement('canvas');
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canvas.width = size;
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canvas.height = size;
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const ctx = canvas.getContext('2d');
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const center = size / 2;
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ctx.strokeStyle = color;
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ctx.lineWidth = 3;
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ctx.beginPath();
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ctx.arc(center, center, (innerRadius + outerRadius) / 2, 0, Math.PI * 2);
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ctx.stroke();
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const texture = new THREE.CanvasTexture(canvas);
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texture.needsUpdate = true;
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return texture;
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}
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export function createSatellites(scene, earthObj) {
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initSatelliteScene(scene, earthObj);
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const positions = new Float32Array(MAX_SATELLITES * 3);
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const colors = new Float32Array(MAX_SATELLITES * 3);
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const dotTexture = createDotTexture();
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const pointsGeometry = new THREE.BufferGeometry();
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pointsGeometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));
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pointsGeometry.setAttribute('color', new THREE.BufferAttribute(colors, 3));
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const pointsMaterial = new THREE.PointsMaterial({
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size: SATELLITE_CONFIG.dotSize,
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map: dotTexture,
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vertexColors: true,
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transparent: true,
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opacity: 0.9,
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sizeAttenuation: false,
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alphaTest: 0.1
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});
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satellitePoints = new THREE.Points(pointsGeometry, pointsMaterial);
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satellitePoints.visible = false;
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satellitePoints.userData = { type: 'satellitePoints' };
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const originalScale = { x: 1, y: 1, z: 1 };
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satellitePoints.onBeforeRender = (renderer, scene, camera, geometry, material) => {
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if (earthObj && earthObj.scale.x !== 1) {
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satellitePoints.scale.set(
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originalScale.x / earthObj.scale.x,
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originalScale.y / earthObj.scale.y,
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originalScale.z / earthObj.scale.z
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);
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} else {
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satellitePoints.scale.set(originalScale.x, originalScale.y, originalScale.z);
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}
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};
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earthObj.add(satellitePoints);
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const trailPositions = new Float32Array(MAX_SATELLITES * TRAIL_LENGTH * 3);
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const trailColors = new Float32Array(MAX_SATELLITES * TRAIL_LENGTH * 3);
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const trailGeometry = new THREE.BufferGeometry();
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trailGeometry.setAttribute('position', new THREE.BufferAttribute(trailPositions, 3));
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trailGeometry.setAttribute('color', new THREE.BufferAttribute(trailColors, 3));
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const trailMaterial = new THREE.LineBasicMaterial({
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vertexColors: true,
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transparent: true,
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opacity: 0.3,
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blending: THREE.AdditiveBlending
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});
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satelliteTrails = new THREE.LineSegments(trailGeometry, trailMaterial);
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satelliteTrails.visible = false;
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satelliteTrails.userData = { type: 'satelliteTrails' };
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earthObj.add(satelliteTrails);
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satellitePositions = [];
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for (let i = 0; i < MAX_SATELLITES; i++) {
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satellitePositions.push({
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current: new THREE.Vector3(),
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trail: [],
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trailIndex: 0,
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trailCount: 0
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});
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}
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return satellitePoints;
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}
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function computeSatellitePosition(satellite, time) {
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try {
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const props = satellite.properties;
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if (!props || !props.norad_cat_id) {
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return null;
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}
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const noradId = props.norad_cat_id;
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const inclination = props.inclination || 53;
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const raan = props.raan || 0;
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const eccentricity = props.eccentricity || 0.0001;
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const argOfPerigee = props.arg_of_perigee || 0;
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const meanAnomaly = props.mean_anomaly || 0;
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const meanMotion = props.mean_motion || 15;
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const epoch = props.epoch || '';
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// Simplified epoch calculation
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let epochDate = epoch && epoch.length >= 10 ? new Date(epoch) : time;
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const epochYear = epochDate.getUTCFullYear() % 100;
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const startOfYear = new Date(Date.UTC(epochDate.getUTCFullYear(), 0, 1));
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const dayOfYear = Math.floor((epochDate - startOfYear) / 86400000) + 1;
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const msOfDay = epochDate.getUTCHours() * 3600000 + epochDate.getUTCMinutes() * 60000 + epochDate.getUTCSeconds() * 1000 + epochDate.getUTCMilliseconds();
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const dayFraction = msOfDay / 86400000;
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const epochStr = String(epochYear).padStart(2, '0') + String(dayOfYear).padStart(3, '0') + '.' + dayFraction.toFixed(8).substring(2);
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// Format eccentricity as "0.0001652" (7 chars after decimal)
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const eccStr = '0' + eccentricity.toFixed(7);
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const tleLine1 = `1 ${noradId.toString().padStart(5)}U 00001A ${epochStr} .00000000 00000-0 00000-0 0 9999`;
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const tleLine2 = `2 ${noradId.toString().padStart(5)} ${raan.toFixed(4).padStart(8)} ${inclination.toFixed(4).padStart(8)} ${eccStr.substring(1)} ${argOfPerigee.toFixed(4).padStart(8)} ${meanAnomaly.toFixed(4).padStart(8)} ${meanMotion.toFixed(8).padStart(11)} 0 9999`;
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const satrec = twoline2satrec(tleLine1, tleLine2);
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if (!satrec || satrec.error) {
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return null;
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}
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const positionAndVelocity = propagate(satrec, time);
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if (!positionAndVelocity || !positionAndVelocity.position) {
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return null;
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}
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const x = positionAndVelocity.position.x;
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const y = positionAndVelocity.position.y;
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const z = positionAndVelocity.position.z;
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if (!x || !y || !z) {
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return null;
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}
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const r = Math.sqrt(x * x + y * y + z * z);
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const earthRadius = 6371;
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const displayRadius = CONFIG.earthRadius * (earthRadius / 6371) * 1.05;
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const scale = displayRadius / r;
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return new THREE.Vector3(x * scale, y * scale, z * scale);
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} catch (e) {
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return null;
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}
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}
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function generateFallbackPosition(satellite, index, total) {
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const radius = CONFIG.earthRadius + 5;
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const noradId = satellite.properties?.norad_cat_id || index;
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const inclination = satellite.properties?.inclination || 53;
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const raan = satellite.properties?.raan || 0;
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const meanAnomaly = satellite.properties?.mean_anomaly || 0;
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const hash = String(noradId).split('').reduce((a, b) => a + b.charCodeAt(0), 0);
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const randomOffset = (hash % 1000) / 1000;
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const normalizedIndex = index / total;
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const theta = normalizedIndex * Math.PI * 2 * 10 + (raan * Math.PI / 180);
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const phi = (inclination * Math.PI / 180) + (meanAnomaly * Math.PI / 180 * 0.1);
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const adjustedPhi = Math.abs(phi % Math.PI);
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const adjustedTheta = theta + randomOffset * Math.PI * 2;
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const x = radius * Math.sin(adjustedPhi) * Math.cos(adjustedTheta);
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const y = radius * Math.cos(adjustedPhi);
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const z = radius * Math.sin(adjustedPhi) * Math.sin(adjustedTheta);
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return new THREE.Vector3(x, y, z);
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}
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export async function loadSatellites() {
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try {
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const response = await fetch(SATELLITE_API);
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if (!response.ok) {
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throw new Error(`HTTP ${response.status}`);
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}
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const data = await response.json();
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satelliteData = data.features || [];
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console.log(`Loaded ${satelliteData.length} satellites`);
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return satelliteData.length;
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} catch (error) {
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console.error('Failed to load satellites:', error);
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return [];
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}
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}
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export function updateSatellitePositions(deltaTime = 0) {
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if (!satellitePoints || satelliteData.length === 0) return;
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animationTime += deltaTime * 0.001;
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const positions = satellitePoints.geometry.attributes.position.array;
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const colors = satellitePoints.geometry.attributes.color.array;
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const trailPositions = satelliteTrails.geometry.attributes.position.array;
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const trailColors = satelliteTrails.geometry.attributes.color.array;
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const baseTime = new Date();
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const count = Math.min(satelliteData.length, MAX_SATELLITES);
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for (let i = 0; i < count; i++) {
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const satellite = satelliteData[i];
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const props = satellite.properties;
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const timeOffset = (i / count) * 2 * Math.PI * 0.1;
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const adjustedTime = new Date(baseTime.getTime() + timeOffset * 1000 * 60 * 10);
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let pos = computeSatellitePosition(satellite, adjustedTime);
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if (!pos) {
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pos = generateFallbackPosition(satellite, i, count);
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}
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satellitePositions[i].current.copy(pos);
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const satPos = satellitePositions[i];
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if (i !== window.lockedSatelliteIndex) {
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satPos.trail[satPos.trailIndex] = pos.clone();
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satPos.trailIndex = (satPos.trailIndex + 1) % TRAIL_LENGTH;
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if (satPos.trailCount < TRAIL_LENGTH) satPos.trailCount++;
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}
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positions[i * 3] = pos.x;
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positions[i * 3 + 1] = pos.y;
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positions[i * 3 + 2] = pos.z;
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const inclination = props?.inclination || 53;
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const name = props?.name || '';
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const isStarlink = name.includes('STARLINK');
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const isGeo = inclination > 20 && inclination < 30;
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const isIridium = name.includes('IRIDIUM');
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let r, g, b;
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if (isStarlink) {
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r = 0.0; g = 0.9; b = 1.0;
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} else if (isGeo) {
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r = 1.0; g = 0.8; b = 0.0;
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} else if (isIridium) {
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r = 1.0; g = 0.5; b = 0.0;
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} else if (inclination > 50 && inclination < 70) {
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r = 0.0; g = 1.0; b = 0.3;
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} else {
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r = 1.0; g = 1.0; b = 1.0;
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}
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colors[i * 3] = r;
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colors[i * 3 + 1] = g;
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colors[i * 3 + 2] = b;
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const sp = satellitePositions[i];
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const trail = sp.trail;
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const tc = sp.trailCount;
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const ti = sp.trailIndex;
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for (let j = 0; j < TRAIL_LENGTH; j++) {
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const trailIdx = (i * TRAIL_LENGTH + j) * 3;
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if (j < tc) {
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const idx = (ti - tc + j + TRAIL_LENGTH) % TRAIL_LENGTH;
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const t = trail[idx];
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if (t) {
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trailPositions[trailIdx] = t.x;
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trailPositions[trailIdx + 1] = t.y;
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trailPositions[trailIdx + 2] = t.z;
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const alpha = (j + 1) / tc;
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trailColors[trailIdx] = r * alpha;
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trailColors[trailIdx + 1] = g * alpha;
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trailColors[trailIdx + 2] = b * alpha;
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} else {
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trailPositions[trailIdx] = pos.x;
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trailPositions[trailIdx + 1] = pos.y;
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trailPositions[trailIdx + 2] = pos.z;
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trailColors[trailIdx] = 0;
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trailColors[trailIdx + 1] = 0;
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trailColors[trailIdx + 2] = 0;
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}
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} else {
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trailPositions[trailIdx] = pos.x;
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trailPositions[trailIdx + 1] = pos.y;
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trailPositions[trailIdx + 2] = pos.z;
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trailColors[trailIdx] = 0;
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trailColors[trailIdx + 1] = 0;
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trailColors[trailIdx + 2] = 0;
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}
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}
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}
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for (let i = count; i < MAX_SATELLITES; i++) {
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positions[i * 3] = 0;
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positions[i * 3 + 1] = 0;
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positions[i * 3 + 2] = 0;
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for (let j = 0; j < TRAIL_LENGTH; j++) {
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const trailIdx = (i * TRAIL_LENGTH + j) * 3;
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trailPositions[trailIdx] = 0;
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trailPositions[trailIdx + 1] = 0;
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trailPositions[trailIdx + 2] = 0;
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}
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}
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satellitePoints.geometry.attributes.position.needsUpdate = true;
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satellitePoints.geometry.attributes.color.needsUpdate = true;
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satellitePoints.geometry.setDrawRange(0, count);
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satelliteTrails.geometry.attributes.position.needsUpdate = true;
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satelliteTrails.geometry.attributes.color.needsUpdate = true;
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}
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export function toggleSatellites(visible) {
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showSatellites = visible;
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if (satellitePoints) {
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satellitePoints.visible = visible;
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}
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if (satelliteTrails) {
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satelliteTrails.visible = visible && showTrails;
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}
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}
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export function toggleTrails(visible) {
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showTrails = visible;
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if (satelliteTrails) {
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satelliteTrails.visible = visible && showSatellites;
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}
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}
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export function getShowSatellites() {
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return showSatellites;
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}
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export function getSatelliteCount() {
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return satelliteData.length;
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}
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export function getSatelliteAt(index) {
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if (index >= 0 && index < satelliteData.length) {
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return satelliteData[index];
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}
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return null;
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}
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export function getSatelliteData() {
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return satelliteData;
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}
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export function selectSatellite(index) {
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selectedSatellite = index;
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return getSatelliteAt(index);
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}
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export function getSatellitePoints() {
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return satellitePoints;
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}
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export function getSatellitePositions() {
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return satellitePositions;
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}
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export function isSatelliteFrontFacing(index, camera) {
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if (!earthObjRef || !camera) return true;
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const positions = satellitePositions;
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if (!positions || !positions[index]) return true;
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const satPos = positions[index].current;
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if (!satPos) return true;
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const toCamera = new THREE.Vector3().subVectors(camera.position, earthObjRef.position).normalize();
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const toSat = new THREE.Vector3().subVectors(satPos, earthObjRef.position).normalize();
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return toCamera.dot(toSat) < 0;
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}
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let earthObjRef = null;
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let sceneRef = null;
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export function showHoverRing(position, isLocked = false) {
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if (!sceneRef || !earthObjRef) return;
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const ringTexture = createRingTexture(8, 12, isLocked ? '#ffcc00' : '#ffffff');
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const spriteMaterial = new THREE.SpriteMaterial({
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map: ringTexture,
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transparent: true,
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opacity: 0.8,
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depthTest: false,
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sizeAttenuation: false
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});
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const ringSize = SATELLITE_CONFIG.ringSize;
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const sprite = new THREE.Sprite(spriteMaterial);
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sprite.position.copy(position);
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const camera = window.camera;
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const cameraDistance = camera ? camera.position.distanceTo(position) : 400;
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const scale = ringSize;
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sprite.scale.set(scale, scale, 1);
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console.log(`[Ring create] ringSize: ${ringSize}, camDist: ${cameraDistance}, scale: ${scale}`);
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earthObjRef.add(sprite);
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if (isLocked) {
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if (lockedRingSprite) {
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earthObjRef.remove(lockedRingSprite);
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}
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lockedRingSprite = sprite;
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if (lockedDotSprite) {
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earthObjRef.remove(lockedDotSprite);
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}
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const dotCanvas = createBrighterDotCanvas();
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const dotTexture = new THREE.CanvasTexture(dotCanvas);
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dotTexture.needsUpdate = true;
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const dotMaterial = new THREE.SpriteMaterial({
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map: dotTexture,
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transparent: true,
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opacity: 1.0,
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depthTest: false
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});
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lockedDotSprite = new THREE.Sprite(dotMaterial);
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lockedDotSprite.position.copy(position);
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lockedDotSprite.scale.set(4 * cameraDistance / 200, 4 * cameraDistance / 200, 1);
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earthObjRef.add(lockedDotSprite);
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} else {
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if (hoverRingSprite) {
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earthObjRef.remove(hoverRingSprite);
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}
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hoverRingSprite = sprite;
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}
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return sprite;
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}
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function createBrighterDotCanvas() {
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const size = DOT_TEXTURE_SIZE * 2;
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const canvas = document.createElement('canvas');
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canvas.width = size;
|
|
canvas.height = size;
|
|
const ctx = canvas.getContext('2d');
|
|
const center = size / 2;
|
|
const gradient = ctx.createRadialGradient(center, center, 0, center, center, center);
|
|
gradient.addColorStop(0, 'rgba(255, 255, 200, 1)');
|
|
gradient.addColorStop(0.3, 'rgba(255, 220, 100, 0.9)');
|
|
gradient.addColorStop(0.7, 'rgba(255, 180, 50, 0.5)');
|
|
gradient.addColorStop(1, 'rgba(255, 150, 0, 0)');
|
|
ctx.fillStyle = gradient;
|
|
ctx.fillRect(0, 0, size, size);
|
|
return canvas;
|
|
}
|
|
|
|
export function hideHoverRings() {
|
|
if (!earthObjRef) return;
|
|
|
|
if (hoverRingSprite) {
|
|
earthObjRef.remove(hoverRingSprite);
|
|
hoverRingSprite = null;
|
|
}
|
|
}
|
|
|
|
export function hideLockedRing() {
|
|
if (!earthObjRef) return;
|
|
if (lockedRingSprite) {
|
|
earthObjRef.remove(lockedRingSprite);
|
|
lockedRingSprite = null;
|
|
}
|
|
if (lockedDotSprite) {
|
|
earthObjRef.remove(lockedDotSprite);
|
|
lockedDotSprite = null;
|
|
}
|
|
}
|
|
|
|
export function updateLockedRingPosition(position) {
|
|
const ringSize = SATELLITE_CONFIG.ringSize;
|
|
const camera = window.camera;
|
|
const cameraDistance = camera ? camera.position.distanceTo(position) : 400;
|
|
if (lockedRingSprite && position) {
|
|
lockedRingSprite.position.copy(position);
|
|
const breathScale = 1 + Math.sin(breathingPhase) * SATELLITE_CONFIG.breathingScaleAmplitude;
|
|
lockedRingSprite.scale.set(ringSize * breathScale, ringSize * breathScale, 1);
|
|
const breathOpacity = SATELLITE_CONFIG.breathingOpacityMin + Math.sin(breathingPhase) * (SATELLITE_CONFIG.breathingOpacityMax - SATELLITE_CONFIG.breathingOpacityMin);
|
|
lockedRingSprite.material.opacity = breathOpacity;
|
|
}
|
|
if (lockedDotSprite && position) {
|
|
lockedDotSprite.position.copy(position);
|
|
const dotBreathScale = 1 + Math.sin(breathingPhase) * SATELLITE_CONFIG.dotBreathingScaleAmplitude;
|
|
lockedDotSprite.scale.set(4 * cameraDistance / 200 * dotBreathScale, 4 * cameraDistance / 200 * dotBreathScale, 1);
|
|
lockedDotSprite.material.opacity = SATELLITE_CONFIG.dotOpacityMin + Math.sin(breathingPhase) * (SATELLITE_CONFIG.dotOpacityMax - SATELLITE_CONFIG.dotOpacityMin);
|
|
}
|
|
}
|
|
|
|
export function updateHoverRingPosition(position) {
|
|
const ringSize = SATELLITE_CONFIG.ringSize;
|
|
const camera = window.camera;
|
|
const cameraDistance = camera ? camera.position.distanceTo(position) : 400;
|
|
const scale = ringSize;
|
|
if (hoverRingSprite && position) {
|
|
hoverRingSprite.position.copy(position);
|
|
hoverRingSprite.scale.set(scale, scale, 1);
|
|
console.log(`[Hover update] ringSize: ${ringSize}, camDist: ${cameraDistance}, scale: ${scale}`);
|
|
}
|
|
}
|
|
|
|
export function setSatelliteRingState(index, state, position) {
|
|
switch (state) {
|
|
case 'hover':
|
|
hideHoverRings();
|
|
showHoverRing(position, false);
|
|
break;
|
|
case 'locked':
|
|
hideHoverRings();
|
|
showHoverRing(position, true);
|
|
break;
|
|
case 'none':
|
|
hideHoverRings();
|
|
hideLockedRing();
|
|
break;
|
|
}
|
|
}
|
|
|
|
export function initSatelliteScene(scene, earth) {
|
|
sceneRef = scene;
|
|
earthObjRef = earth;
|
|
}
|
|
|
|
let predictedOrbitLine = null;
|
|
|
|
function calculateOrbitalPeriod(meanMotion) {
|
|
return 86400 / meanMotion;
|
|
}
|
|
|
|
function calculatePredictedOrbit(satellite, periodSeconds, sampleInterval = 10) {
|
|
const points = [];
|
|
const samples = Math.ceil(periodSeconds / sampleInterval);
|
|
const now = new Date();
|
|
|
|
// Full orbit: from now to now+period (complete circle forward)
|
|
for (let i = 0; i <= samples; i++) {
|
|
const time = new Date(now.getTime() + i * sampleInterval * 1000);
|
|
const pos = computeSatellitePosition(satellite, time);
|
|
if (pos) points.push(pos);
|
|
}
|
|
|
|
// If we don't have enough points, use fallback orbit
|
|
if (points.length < samples * 0.5) {
|
|
points.length = 0;
|
|
const radius = CONFIG.earthRadius + 5;
|
|
const noradId = satellite.properties?.norad_cat_id || 0;
|
|
const inclination = satellite.properties?.inclination || 53;
|
|
const raan = satellite.properties?.raan || 0;
|
|
const meanAnomaly = satellite.properties?.mean_anomaly || 0;
|
|
|
|
for (let i = 0; i <= samples; i++) {
|
|
const theta = (i / samples) * Math.PI * 2;
|
|
const phi = (inclination * Math.PI / 180);
|
|
const x = radius * Math.sin(phi) * Math.cos(theta + raan * Math.PI / 180);
|
|
const y = radius * Math.cos(phi);
|
|
const z = radius * Math.sin(phi) * Math.sin(theta + raan * Math.PI / 180);
|
|
points.push(new THREE.Vector3(x, y, z));
|
|
}
|
|
}
|
|
|
|
return points;
|
|
}
|
|
|
|
export function showPredictedOrbit(satellite) {
|
|
hidePredictedOrbit();
|
|
|
|
const props = satellite.properties;
|
|
const meanMotion = props?.mean_motion || 15;
|
|
const periodSeconds = calculateOrbitalPeriod(meanMotion);
|
|
|
|
const points = calculatePredictedOrbit(satellite, periodSeconds);
|
|
if (points.length < 2) return;
|
|
|
|
const positions = new Float32Array(points.length * 3);
|
|
const colors = new Float32Array(points.length * 3);
|
|
|
|
for (let i = 0; i < points.length; i++) {
|
|
positions[i * 3] = points[i].x;
|
|
positions[i * 3 + 1] = points[i].y;
|
|
positions[i * 3 + 2] = points[i].z;
|
|
|
|
const t = i / (points.length - 1);
|
|
colors[i * 3] = 1 - t * 0.4;
|
|
colors[i * 3 + 1] = 1 - t * 0.6;
|
|
colors[i * 3 + 2] = t;
|
|
}
|
|
|
|
const geometry = new THREE.BufferGeometry();
|
|
geometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));
|
|
geometry.setAttribute('color', new THREE.BufferAttribute(colors, 3));
|
|
|
|
const material = new THREE.LineBasicMaterial({
|
|
vertexColors: true,
|
|
transparent: true,
|
|
opacity: 0.8,
|
|
blending: THREE.AdditiveBlending
|
|
});
|
|
|
|
predictedOrbitLine = new THREE.Line(geometry, material);
|
|
earthObjRef.add(predictedOrbitLine);
|
|
}
|
|
|
|
export function hidePredictedOrbit() {
|
|
if (predictedOrbitLine) {
|
|
earthObjRef.remove(predictedOrbitLine);
|
|
predictedOrbitLine.geometry.dispose();
|
|
predictedOrbitLine.material.dispose();
|
|
predictedOrbitLine = null;
|
|
}
|
|
}
|