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map.js
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mapboxgl.accessToken = 'pk.eyJ1IjoidGFoYWVyZGVtb3p0dXJrIiwiYSI6ImNqZmZ1Nm9zNzM4N3gycW1tMGVreHJ0enQifQ.m_BVyHJ6Ukop8vUSasQv2w';
let viewportWidth = window.innerWidth || document.documentElement.clientWidth;
let zoom;
let mapActive = true;
let initialLng = 15.2433;
let initialLat = -28.9637;
zoom = calculateZoom(viewportWidth);
let zoomInitial = zoom;
let initialZoom = calculateZoom(viewportWidth);
let flInitialZoom = 19;
const istanbulBounds = [
[28.4, 40.7], // Southwest coordinates
[29.4, 41.3] // Northeast coordinates
];
function checkScrollTop() {
if (window.scrollY === 0) {
console.log("The page is scrolled back to the top.");
}
}
const map = new mapboxgl.Map({
container: 'map',
color: 'white',
style: 'mapbox://styles/tahaerdemozturk/clwt6u2xg05k601nx3zbs1cun',
zoom: zoom,
center: [15.9637, -28.2433],
scrollZoom: false,
doubleClickZoom: false,
boxZoom: false,
dragRotate: false,
dragPan: false,
touchZoomRotate: false,
touchPitchHandler: false,
attributionControl: false,
});
const flMap = new mapboxgl.Map({
container: 'flMap',
style: 'mapbox://styles/tahaerdemozturk/clyhz0gtq01nt01qo3ynh5244',
zoom: flInitialZoom,
center: [28.840361, 40.998400],
scrollZoom: false,
doubleClickZoom: false,
boxZoom: false,
dragRotate: false,
dragPan: true,
touchZoomRotate: false,
touchPitchHandler: false,
attributionControl: false,
maxBounds: istanbulBounds,
});
function getScrollPositionY() {
return window.scrollY || document.documentElement.scrollTop;
}
window.addEventListener('scroll', function() {
var scrollTop = getScrollPositionY();
return scrollTop;
});
document.addEventListener("resize", (event) => {
viewportWidth = window.innerWidth || document.documentElement.clientWidth;
zoom = calculateZoom(viewportWidth);
map.setZoom(zoom);
});
document.addEventListener("DOMContentLoaded", (event) => {
//Title to Globe
function frame01() {
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#mainTitle",
start: '50% top',
end: '250% -100%',
pin: false,
scrub: true,
markers: false,
onEnter: self => {
},
onUpdate: self => {
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLng = 37.032;
const targetLat = 37.166;
const targetZoom = 5;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 15;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (initialLng - center.lng) / 20;
latStep = (initialLat - center.lat) / 20;
zoomStep = (initialZoom - map.getZoom()) / 25;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t
});
},
onLeave: self => {
},
},
});
}
//Counter
function frame02() {
const layersToToggle = [];
const layersToHide = ['feb6-eq-circle-stroke-start', 'feb6-eq-circle-stroke-start-t', 'feb6-eq-circle-stroke-end', 'feb6-eq-circle-stroke-end-t'];
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#SEC01",
start: 'center center',
end: () => `+=${window.innerHeight * 1.425}`,
pin: true,
scrub: true,
markers: false, // Set to true for debugging, set to false to remove markers
onUpdate: self => {
const startDate = new Date("February 1, 2024 00:00:00");
const endDate = new Date("February 6, 2024 04:17:35");
const totalDuration = endDate - startDate;
const dateTimeElement = document.getElementById("date-time");
// Calculate the progress (0 to 1)
let progress = self.progress;
// Map progress to a range where 100% progress is at 50% scroll
if (progress > 0.5) {
progress = 1; // Cap progress at 1 (end date) for anything beyond 50% scroll
} else {
progress = progress * 2; // Scale the first half to cover 0 to 1 range
}
// Calculate the current time based on the progress
const currentTime = new Date(startDate.getTime() + totalDuration * progress);
// Format the current time
const options = { month: 'long', day: 'numeric', hour: 'numeric', minute: 'numeric', hour12: true };
const formattedTime = currentTime.toLocaleString('en-US', options);
// Update the text element
dateTimeElement.textContent = formattedTime;
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLng = 37.032;
const targetLat = 37.166;
const targetZoom = 5;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
// Forward animation steps
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 15;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (initialLng - center.lng) / 100;
latStep = (initialLat - center.lat) / 100;
zoomStep = (5 - map.getZoom()) / 25;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t // linear easing
});
},
onEnter: () => {
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onEnterBack: () => {
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeaveBack: () => {
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeave: self => {
map.jumpTo({
center: [37.166, 37.032],
zoom: 5,
duration: 1,
easing: t => t // linear easing
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
},
});
}
//Grab the first earthquake timeline
function frame03() {
const layersToToggle = ['feb6-eq-circle-stroke-start', 'feb6-eq-circle-stroke-start-t'];
const layersToHide = ['feb6-eq-circle-stroke-end', 'feb6-eq-circle-stroke-end-t'];
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#TL01",
start: 'top top',
end: '1400% top',
pin: true,
scrub: true,
markers: false,
onEnter: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onEnterBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeaveBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeave: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onUpdate: self => {
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLng = 37.032;
const targetLat = 37.166;
const targetZoom = 7.5;
const f02Lng = 37.032;
const f02Lat = 37.166;
const f02Zoom = 5;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 25;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (f02Lng - center.lng) / 100;
latStep = (f02Lat - center.lat) / 100;
zoomStep = (f02Zoom - map.getZoom()) / 50;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t
});
},
},
});
}
//In-between two quakes
function frame04() {
const layersToToggle = [];
const layersToToggleWhenLeft = ['feb6-eq-circle-stroke-end', 'feb6-eq-circle-stroke-end-t'];
const earthquakeLayer = 'feb6-eq-circle-stroke';
const sourceLayer = 'usgs-feb67-eq-data-0ezrpr';
const startTime = 1675646254342;
const endTime = 1675689088811;
map.on('idle', () => {
const features = map.querySourceFeatures('composite', {
sourceLayer: sourceLayer,
}).sort((a, b) => a.properties.time - b.properties.time)
.filter(f => f.properties.time >= startTime && f.properties.time <= endTime);
if (features.length === 0) {
return;
}
const tl = gsap.timeline({
scrollTrigger: {
trigger: "#TL02",
start: 'top bottom',
end: 'bottom top',
pin: false,
scrub: true,
markers: false,
onEnter: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
map.setLayoutProperty(earthquakeLayer, 'visibility', 'visible');
},
onEnterBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
map.setLayoutProperty(earthquakeLayer, 'visibility', 'visible');
},
onLeaveBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
map.setLayoutProperty(earthquakeLayer, 'visibility', 'none');
},
onUpdate: self => {
const progress = self.progress * 4;
const totalFeatures = features.length;
let currentFeatureIndex = Math.floor(progress * totalFeatures);
// Ensure currentFeatureIndex is within bounds
currentFeatureIndex = Math.max(0, Math.min(currentFeatureIndex, totalFeatures - 1));
const velocity = self.getVelocity();
let filter, currentDate;
if (velocity >= 0 && window.scrollY > 0) {
filter = [
"all",
["<=", ["get", "time"], features[currentFeatureIndex].properties.time]
];
currentDate = features[currentFeatureIndex].properties.time;
} else if (velocity < 0 && window.scrollY > 0) {
currentFeatureIndex = Math.max(currentFeatureIndex - 1, 0);
filter = [
"all",
["<=", ["get", "time"], features[currentFeatureIndex].properties.time]
];
currentDate = features[currentFeatureIndex].properties.time;
}
map.setFilter(earthquakeLayer, filter);
},
onLeave: () => {
map.setLayoutProperty(earthquakeLayer, 'visibility', 'visible');
const lastFeature = features[features.length - 1];
const filter = [
"all",
["<=", ["get", "time"], lastFeature.properties.time]
];
map.setFilter(earthquakeLayer, filter);
layersToToggleWhenLeft.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
},
},
});
});
}
//Get the second timeline
function frame05() {
const layersToToggle = ['feb6-eq-circle-stroke-end', 'feb6-eq-circle-stroke-end-t'];
const layersToHide = [];
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#TL03",
start: '50% top',
end: '250% top',
pin: true,
scrub: true,
markers: false,
onEnter: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onEnterBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeaveBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onUpdate: self => {
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLat = 38.010;
const targetLng = 37.197;
const targetZoom = 7.5;
const progress = self.progress;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 15;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (7.5 - map.getZoom()) / 15;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t // linear easing
});
},
onLeave: self => {
map.jumpTo({
center: [37.197, 38.010],
zoom: 7.5,
});
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
},
});
}
//EAF Chapter Intro
function frame052() {
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#FS00",
start: 'top top',
end: '700% 27%',
pin: true,
scrub: true,
markers: false,
onEnter: () => {
},
onEnterBack: () => {
},
onLeaveBack: () => {
},
onUpdate: self => {
const title = document.getElementById('fs00Title');
const container = document.getElementById('FS00');
const margin = document.getElementById('chp01');
const initialContainerHeight = 300;
const progress = self.progress;
const windowWidth = window.innerWidth;
let newFontSize = 7 - (progress * 18);
let newMarginSize = 50 - (progress * 500);
let newContSize = initialContainerHeight - (progress * 850);
if (newFontSize < 2.45) {
newFontSize = 2.45;
}
if (newContSize < 150) {
newContSize = 150;
}
if (newMarginSize < 10) {
newMarginSize = 10;
}
if (windowWidth < 1024) {
newFontSize = 7 - (progress * 3);
if (newFontSize < 6) {
newFontSize = 6;
}
}
title.style.fontSize = `${newFontSize}vw`;
container.style.height = `${newContSize}px`;
margin.style.marginTop = `${newMarginSize}px`;
},
},
});
}
//EAF Section
function frame06() {
const layersToToggle = ['Fault-Paths-L01-EAF'];
const layersToHide = [];
const dateDisplay = document.getElementById('date-time-scroll-counter');
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#FS01",
start: 'top center',
end: 'bottom top',
pin: false,
scrub: true,
markers: false,
onEnter: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onEnterBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeaveBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onUpdate: self => {
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLat = 38.410;
const targetLng = 39.939;
const targetZoom = 6.5;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 15;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (9 - map.getZoom()) / 15;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t // linear easing
});
},
onLeave: self => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
},
});
}
//Eastern Anatolia
function frame07() {
const layersToToggle = [];
const layersToHide = [];
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#FS02",
start: 'top top',
end: '2000% top',
pin: true,
scrub: true,
markers: false,
onEnter: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onEnterBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeaveBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onUpdate: self => {
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLat = 38.410;
const targetLng = 39.939;
const targetZoom = 6.5;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
// Forward animation steps
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 15;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (7.5 - map.getZoom()) / 15;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t // linear easing
});
},
onLeave: self => {
map.jumpTo({
center: [39.939, 38.410],
zoom: 6.5,
});
},
onRefresh: self => {
const pinnedElement = self.pin;
pinnedElement.style.width = '100%';
pinnedElement.style.maxWidth = '100%';
},
},
});
}
//NAF Chapter Intro
function frame072() {
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#FS032",
start: 'top top',
end: '400% 32%',
pin: true,
scrub: true,
markers: false,
onEnter: () => {},
onEnterBack: () => {},
onLeaveBack: () => {},
onUpdate: self => {
const title = document.getElementById('fs0003Title');
const container = document.getElementById('FS032');
const margin = document.getElementById('chp02');
const initialContainerHeight = 300;
const progress = self.progress;
const windowWidth = window.innerWidth;
let newFontSize = 7 - (progress * 18);
let newMarginSize = 50 - (progress * 500);
let newContSize = initialContainerHeight - (progress * 850);
if (newFontSize < 2.45) {
newFontSize = 2.45;
}
if (newContSize < 150) {
newContSize = 150;
}
if (newMarginSize < 10) {
newMarginSize = 10;
}
if (windowWidth < 1024) {
newFontSize = 7 - (progress * 3);
if (newFontSize < 6) {
newFontSize = 6;
}
}
title.style.fontSize = `${newFontSize}vw`;
container.style.height = `${newContSize}px`;
margin.style.marginTop = `${newMarginSize}px`;
},
onLeave: () => {
},
},
});
}
//North Anatolia Textbox
function frame08() {
const layersToToggle = ['Fault-Paths-L02-NAF'];
const layersToHide = ['feb6-eq-circle-stroke-start-t', 'feb6-eq-circle-stroke-end-t'];
const hideonLeave = ['Fault-Paths-L01-EAF'];
var tl = gsap.timeline({
scrollTrigger: {
trigger: "#SEC04",
start: 'top 60%',
end: '500% top',
pin: true,
scrub: true,
markers: false,
onEnter: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onEnterBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
onLeaveBack: () => {
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
},
onUpdate: self => {
const velocity = self.getVelocity();
const center = map.getCenter();
const targetLat = 39.123;
const targetLng = 34.534;
const targetZoom = 6;
let lngStep, latStep, zoomStep;
if (velocity > 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (targetZoom - map.getZoom()) / 15;
} else if (velocity < 0 && window.scrollY > 0) {
lngStep = (targetLng - center.lng) / 20;
latStep = (targetLat - center.lat) / 20;
zoomStep = (6.5 - map.getZoom()) / 15;
} else {
lngStep = 0;
latStep = 0;
zoomStep = 0;
}
map.easeTo({
center: [center.lng + lngStep, center.lat + latStep],
zoom: map.getZoom() + zoomStep,
duration: 0,
easing: t => t // linear easing
});
},
onLeave: () => {
map.jumpTo({
center: [34.534, 39.123],
zoom: 6,
});
layersToToggle.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'visible');
});
layersToHide.forEach(layerId => {
map.setLayoutProperty(layerId, 'visibility', 'none');
});
},
},
});
}
function frame09() {
const earthquakeLayers = [
'1939', '1939-T', '1939-P', '1942', '1942-T', '1942-P', '1943', '1943-T',
'1944', '1944-T', '1944-P', '1957', '1957-T', '1957-P', '1967', '1967-T', '1967-P',
'1999', '1999-T',
];
const sourceLayers = [
'major-earthquakes-on-NAF-8y0uiu',
'gem_active_faults_harmonized-9xzarf'
];
let targetPositions = [];
let currentVisibleLayers = new Set();
let lastUpdateTime = 0;
const updateInterval = 50; // ms
// Simple debounce function
function debounce(func, wait) {
let timeout;
return function executedFunction(...args) {
const later = () => {
clearTimeout(timeout);
func(...args);
};
clearTimeout(timeout);
timeout = setTimeout(later, wait);
};
}
// Web Worker for heavy computations
const worker = new Worker(URL.createObjectURL(new Blob([`
self.onmessage = function(e) {
const { earthquakeLayers, featureData } = e.data;
const targetPositions = [];
const totalLayers = earthquakeLayers.length;
const step = 1 / totalLayers;
for (let i = 0; i < totalLayers; i++) {
const layer = earthquakeLayers[i];
const coordinates = featureData[layer];
if (coordinates) {
const targetLat = coordinates[1];
const targetLng = coordinates[0];
const targetZoom = 6 + (10 - 6) * (i / totalLayers);
targetPositions.push({ lat: targetLat, lng: targetLng, zoom: targetZoom });
}
}
self.postMessage({ targetPositions });
};
`])));
worker.onmessage = function(e) {
targetPositions = e.data.targetPositions;
};
map.on('styledata', function () {
if (map.isStyleLoaded()) {
const featureData = {};
earthquakeLayers.forEach(layer => {
for (const sourceLayer of sourceLayers) {
const features = map.querySourceFeatures('composite', {
sourceLayer: sourceLayer,
filter: ['==', 'name', layer]
});
if (features.length > 0) {
featureData[layer] = features[0].geometry.coordinates[0];
break;
}
}
});
worker.postMessage({ earthquakeLayers, featureData });
}
});
function binarySearchStep(progress) {
let low = 0, high = earthquakeLayers.length - 1;
const step = 1 / earthquakeLayers.length;
while (low <= high) {
const mid = Math.floor((low + high) / 2);
if ((mid * step) <= progress && progress < ((mid + 1) * step)) {
return mid;
} else if (progress < (mid * step)) {
high = mid - 1;
} else {
low = mid + 1;
}
}
return low;
}
function updateLayerVisibility(currentStep) {
const newVisibleLayers = new Set(earthquakeLayers.slice(0, currentStep + 1));
const toShow = [...newVisibleLayers].filter(x => !currentVisibleLayers.has(x));
const toHide = [...currentVisibleLayers].filter(x => !newVisibleLayers.has(x));
if (toShow.length > 0 || toHide.length > 0) {
requestAnimationFrame(() => {
toShow.forEach(layerId => map.setLayoutProperty(layerId, 'visibility', 'visible'));
toHide.forEach(layerId => map.setLayoutProperty(layerId, 'visibility', 'none'));
currentVisibleLayers = newVisibleLayers;
});
}
}
const update = (self) => {
const now = performance.now();
if (now - lastUpdateTime < updateInterval) return;
lastUpdateTime = now;