align-html-elements-to-3d-globe-too-many-labels.html 6.4 KB

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  1. <!-- Licensed under a BSD license. See license.html for license -->
  2. <!DOCTYPE html>
  3. <html>
  4. <head>
  5. <meta charset="utf-8">
  6. <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
  7. <title>Three.js - Align HTML Elements to 3D Globe</title>
  8. <style>
  9. html, body {
  10. height: 100%;
  11. margin: 0;
  12. font-family: sans-serif;
  13. }
  14. #c {
  15. width: 100%; /* let our container decide our size */
  16. height: 100%;
  17. display: block;
  18. }
  19. #container {
  20. position: relative; /* makes this the origin of its children */
  21. width: 100%;
  22. height: 100%;
  23. overflow: hidden;
  24. }
  25. #labels {
  26. position: absolute; /* let us position ourself inside the container */
  27. z-index: 0; /* make a new stacking context so children don't sort with rest of page */
  28. left: 0; /* make our position the top left of the container */
  29. top: 0;
  30. color: white;
  31. }
  32. #labels>div {
  33. position: absolute; /* let us position them inside the container */
  34. left: 0; /* make their default position the top left of the container */
  35. top: 0;
  36. cursor: pointer; /* change the cursor to a hand when over us */
  37. font-size: small;
  38. user-select: none; /* don't let the text get selected */
  39. pointer-events: none; /* make us invisible to the pointer */
  40. text-shadow: /* create a black outline */
  41. -1px -1px 0 #000,
  42. 0 -1px 0 #000,
  43. 1px -1px 0 #000,
  44. 1px 0 0 #000,
  45. 1px 1px 0 #000,
  46. 0 1px 0 #000,
  47. -1px 1px 0 #000,
  48. -1px 0 0 #000;
  49. }
  50. #labels>div:hover {
  51. color: red;
  52. }
  53. </style>
  54. </head>
  55. <body>
  56. <div id="container">
  57. <canvas id="c"></canvas>
  58. <div id="labels"></div>
  59. </div>
  60. </body>
  61. <script type="importmap">
  62. {
  63. "imports": {
  64. "three": "../../build/three.module.js",
  65. "three/addons/": "../../examples/jsm/"
  66. }
  67. }
  68. </script>
  69. <script type="module">
  70. import * as THREE from 'three';
  71. import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
  72. function main() {
  73. const canvas = document.querySelector( '#c' );
  74. const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
  75. const fov = 60;
  76. const aspect = 2; // the canvas default
  77. const near = 0.1;
  78. const far = 10;
  79. const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
  80. camera.position.z = 2.5;
  81. const controls = new OrbitControls( camera, canvas );
  82. controls.enableDamping = true;
  83. controls.enablePan = false;
  84. controls.minDistance = 1.2;
  85. controls.maxDistance = 4;
  86. controls.update();
  87. const scene = new THREE.Scene();
  88. scene.background = new THREE.Color( '#236' );
  89. {
  90. const loader = new THREE.TextureLoader();
  91. const texture = loader.load( 'resources/data/world/country-outlines-4k.png', render );
  92. const geometry = new THREE.SphereGeometry( 1, 64, 32 );
  93. const material = new THREE.MeshBasicMaterial( { map: texture } );
  94. scene.add( new THREE.Mesh( geometry, material ) );
  95. }
  96. async function loadJSON( url ) {
  97. const req = await fetch( url );
  98. return req.json();
  99. }
  100. let countryInfos;
  101. async function loadCountryData() {
  102. countryInfos = await loadJSON( 'resources/data/world/country-info.json' ); /* threejs.org: url */
  103. const lonFudge = Math.PI * 1.5;
  104. const latFudge = Math.PI;
  105. // these helpers will make it easy to position the boxes
  106. // We can rotate the lon helper on its Y axis to the longitude
  107. const lonHelper = new THREE.Object3D();
  108. // We rotate the latHelper on its X axis to the latitude
  109. const latHelper = new THREE.Object3D();
  110. lonHelper.add( latHelper );
  111. // The position helper moves the object to the edge of the sphere
  112. const positionHelper = new THREE.Object3D();
  113. positionHelper.position.z = 1;
  114. latHelper.add( positionHelper );
  115. const labelParentElem = document.querySelector( '#labels' );
  116. for ( const countryInfo of countryInfos ) {
  117. const { lat, lon, name } = countryInfo;
  118. // adjust the helpers to point to the latitude and longitude
  119. lonHelper.rotation.y = THREE.MathUtils.degToRad( lon ) + lonFudge;
  120. latHelper.rotation.x = THREE.MathUtils.degToRad( lat ) + latFudge;
  121. // get the position of the lat/lon
  122. positionHelper.updateWorldMatrix( true, false );
  123. const position = new THREE.Vector3();
  124. positionHelper.getWorldPosition( position );
  125. countryInfo.position = position;
  126. // add an element for each country
  127. const elem = document.createElement( 'div' );
  128. elem.textContent = name;
  129. labelParentElem.appendChild( elem );
  130. countryInfo.elem = elem;
  131. }
  132. requestRenderIfNotRequested();
  133. }
  134. loadCountryData();
  135. const tempV = new THREE.Vector3();
  136. function updateLabels() {
  137. // exit if we have not yet loaded the JSON file
  138. if ( ! countryInfos ) {
  139. return;
  140. }
  141. for ( const countryInfo of countryInfos ) {
  142. const { position, elem } = countryInfo;
  143. // get the normalized screen coordinate of that position
  144. // x and y will be in the -1 to +1 range with x = -1 being
  145. // on the left and y = -1 being on the bottom
  146. tempV.copy( position );
  147. tempV.project( camera );
  148. // convert the normalized position to CSS coordinates
  149. const x = ( tempV.x * .5 + .5 ) * canvas.clientWidth;
  150. const y = ( tempV.y * - .5 + .5 ) * canvas.clientHeight;
  151. // move the elem to that position
  152. elem.style.transform = `translate(-50%, -50%) translate(${x}px,${y}px)`;
  153. // set the zIndex for sorting
  154. elem.style.zIndex = ( - tempV.z * .5 + .5 ) * 100000 | 0;
  155. }
  156. }
  157. function resizeRendererToDisplaySize( renderer ) {
  158. const canvas = renderer.domElement;
  159. const width = canvas.clientWidth;
  160. const height = canvas.clientHeight;
  161. const needResize = canvas.width !== width || canvas.height !== height;
  162. if ( needResize ) {
  163. renderer.setSize( width, height, false );
  164. }
  165. return needResize;
  166. }
  167. let renderRequested = false;
  168. function render() {
  169. renderRequested = undefined;
  170. if ( resizeRendererToDisplaySize( renderer ) ) {
  171. const canvas = renderer.domElement;
  172. camera.aspect = canvas.clientWidth / canvas.clientHeight;
  173. camera.updateProjectionMatrix();
  174. }
  175. controls.update();
  176. updateLabels();
  177. renderer.render( scene, camera );
  178. }
  179. render();
  180. function requestRenderIfNotRequested() {
  181. if ( ! renderRequested ) {
  182. renderRequested = true;
  183. requestAnimationFrame( render );
  184. }
  185. }
  186. controls.addEventListener( 'change', requestRenderIfNotRequested );
  187. window.addEventListener( 'resize', requestRenderIfNotRequested );
  188. }
  189. main();
  190. </script>
  191. </html>