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218 lines
5.4 KiB
HTML
218 lines
5.4 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 w/hiding</title>
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<style>
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html, body {
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margin: 0;
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height: 100%;
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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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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: large;
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user-select: none; /* don't let the text get selected */
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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 = 75;
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const aspect = 2; // the canvas default
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const near = 1.1;
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const far = 20;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.z = 7;
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const controls = new OrbitControls( camera, canvas );
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controls.target.set( 0, 0, 0 );
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controls.update();
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const scene = new THREE.Scene();
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{
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const color = 0xFFFFFF;
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const intensity = 3;
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const light = new THREE.DirectionalLight( color, intensity );
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light.position.set( - 1, 2, 4 );
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scene.add( light );
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}
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const boxWidth = 1;
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const boxHeight = 1;
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const boxDepth = 1;
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const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
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const labelContainerElem = document.querySelector( '#labels' );
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function makeInstance( geometry, color, x, name ) {
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const material = new THREE.MeshPhongMaterial( { color } );
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const cube = new THREE.Mesh( geometry, material );
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scene.add( cube );
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cube.position.x = x;
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const elem = document.createElement( 'div' );
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elem.textContent = name;
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labelContainerElem.appendChild( elem );
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return { cube, elem };
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}
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const cubes = [
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makeInstance( geometry, 0x44aa88, 0, 'Aqua' ),
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makeInstance( geometry, 0x8844aa, - 2, 'Purple' ),
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makeInstance( geometry, 0xaa8844, 2, 'Gold' ),
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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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const tempV = new THREE.Vector3();
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const raycaster = new THREE.Raycaster();
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function render( time ) {
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time *= 0.001;
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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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cubes.forEach( ( cubeInfo, ndx ) => {
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const { cube, elem } = cubeInfo;
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const speed = 1 + ndx * .1;
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const rot = time * speed;
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cube.rotation.x = rot;
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cube.rotation.y = rot;
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// get the position of the center of the cube
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cube.updateWorldMatrix( true, false );
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cube.getWorldPosition( tempV );
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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.project( camera );
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// ask the raycaster for all the objects that intersect
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// from the eye toward this object's position
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raycaster.setFromCamera( tempV, camera );
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const intersectedObjects = raycaster.intersectObjects( scene.children );
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// We're visible if the first intersection is this object.
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const show = intersectedObjects.length && cube === intersectedObjects[ 0 ].object;
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if ( ! show || Math.abs( tempV.z ) > 1 ) {
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// hide the label
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elem.style.display = 'none';
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} else {
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// unhide the label
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elem.style.display = '';
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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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}
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} );
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renderer.render( scene, camera );
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requestAnimationFrame( render );
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}
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requestAnimationFrame( render );
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}
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main();
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</script>
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</html>
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