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254 lines
6.4 KiB
HTML
254 lines
6.4 KiB
HTML
2 months ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Align HTML Elements to 3D Globe</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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font-family: sans-serif;
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}
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#c {
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width: 100%; /* let our container decide our size */
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height: 100%;
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display: block;
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}
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#container {
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position: relative; /* makes this the origin of its children */
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width: 100%;
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height: 100%;
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overflow: hidden;
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}
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#labels {
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position: absolute; /* let us position ourself inside the container */
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z-index: 0; /* make a new stacking context so children don't sort with rest of page */
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left: 0; /* make our position the top left of the container */
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top: 0;
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color: white;
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}
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#labels>div {
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position: absolute; /* let us position them inside the container */
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left: 0; /* make their default position the top left of the container */
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top: 0;
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cursor: pointer; /* change the cursor to a hand when over us */
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font-size: small;
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user-select: none; /* don't let the text get selected */
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pointer-events: none; /* make us invisible to the pointer */
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text-shadow: /* create a black outline */
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-1px -1px 0 #000,
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0 -1px 0 #000,
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1px -1px 0 #000,
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1px 0 0 #000,
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1px 1px 0 #000,
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0 1px 0 #000,
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-1px 1px 0 #000,
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-1px 0 0 #000;
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}
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#labels>div:hover {
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color: red;
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}
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</style>
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</head>
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<body>
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<div id="container">
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<canvas id="c"></canvas>
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<div id="labels"></div>
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</div>
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</body>
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<script type="importmap">
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{
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"imports": {
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"three": "../../build/three.module.js",
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"three/addons/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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function main() {
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const canvas = document.querySelector( '#c' );
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const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
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const fov = 60;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 10;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.z = 2.5;
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const controls = new OrbitControls( camera, canvas );
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controls.enableDamping = true;
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controls.enablePan = false;
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controls.minDistance = 1.2;
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controls.maxDistance = 4;
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controls.update();
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const scene = new THREE.Scene();
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scene.background = new THREE.Color( '#236' );
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{
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const loader = new THREE.TextureLoader();
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const texture = loader.load( 'resources/data/world/country-outlines-4k.png', render );
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const geometry = new THREE.SphereGeometry( 1, 64, 32 );
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const material = new THREE.MeshBasicMaterial( { map: texture } );
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scene.add( new THREE.Mesh( geometry, material ) );
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}
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async function loadJSON( url ) {
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const req = await fetch( url );
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return req.json();
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}
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let countryInfos;
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async function loadCountryData() {
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countryInfos = await loadJSON( 'resources/data/world/country-info.json' ); /* threejs.org: url */
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const lonFudge = Math.PI * 1.5;
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const latFudge = Math.PI;
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// these helpers will make it easy to position the boxes
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// We can rotate the lon helper on its Y axis to the longitude
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const lonHelper = new THREE.Object3D();
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// We rotate the latHelper on its X axis to the latitude
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const latHelper = new THREE.Object3D();
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lonHelper.add( latHelper );
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// The position helper moves the object to the edge of the sphere
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const positionHelper = new THREE.Object3D();
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positionHelper.position.z = 1;
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latHelper.add( positionHelper );
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const labelParentElem = document.querySelector( '#labels' );
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for ( const countryInfo of countryInfos ) {
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const { lat, lon, name } = countryInfo;
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// adjust the helpers to point to the latitude and longitude
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lonHelper.rotation.y = THREE.MathUtils.degToRad( lon ) + lonFudge;
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latHelper.rotation.x = THREE.MathUtils.degToRad( lat ) + latFudge;
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// get the position of the lat/lon
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positionHelper.updateWorldMatrix( true, false );
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const position = new THREE.Vector3();
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positionHelper.getWorldPosition( position );
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countryInfo.position = position;
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// add an element for each country
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const elem = document.createElement( 'div' );
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elem.textContent = name;
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labelParentElem.appendChild( elem );
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countryInfo.elem = elem;
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}
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requestRenderIfNotRequested();
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}
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loadCountryData();
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const tempV = new THREE.Vector3();
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function updateLabels() {
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// exit if we have not yet loaded the JSON file
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if ( ! countryInfos ) {
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return;
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}
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for ( const countryInfo of countryInfos ) {
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const { position, elem } = countryInfo;
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// get the normalized screen coordinate of that position
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// x and y will be in the -1 to +1 range with x = -1 being
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// on the left and y = -1 being on the bottom
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tempV.copy( position );
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tempV.project( camera );
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// convert the normalized position to CSS coordinates
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const x = ( tempV.x * .5 + .5 ) * canvas.clientWidth;
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const y = ( tempV.y * - .5 + .5 ) * canvas.clientHeight;
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// move the elem to that position
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elem.style.transform = `translate(-50%, -50%) translate(${x}px,${y}px)`;
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// set the zIndex for sorting
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elem.style.zIndex = ( - tempV.z * .5 + .5 ) * 100000 | 0;
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}
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}
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function resizeRendererToDisplaySize( renderer ) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if ( needResize ) {
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renderer.setSize( width, height, false );
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}
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return needResize;
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}
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let renderRequested = false;
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function render() {
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renderRequested = undefined;
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if ( resizeRendererToDisplaySize( renderer ) ) {
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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controls.update();
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updateLabels();
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renderer.render( scene, camera );
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}
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render();
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function requestRenderIfNotRequested() {
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if ( ! renderRequested ) {
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renderRequested = true;
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requestAnimationFrame( render );
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}
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}
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controls.addEventListener( 'change', requestRenderIfNotRequested );
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window.addEventListener( 'resize', requestRenderIfNotRequested );
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}
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main();
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</script>
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</html>
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