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208 lines
5.2 KiB
HTML
208 lines
5.2 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 - Canvas Textured Labels Scale to Fit</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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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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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 = 0.1;
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const far = 50;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.set( 0, 2, 5 );
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const controls = new OrbitControls( camera, canvas );
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controls.target.set( 0, 2, 0 );
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controls.update();
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const scene = new THREE.Scene();
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scene.background = new THREE.Color( 'white' );
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function addLight( position ) {
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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( ...position );
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scene.add( light );
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scene.add( light.target );
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}
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addLight( [ - 3, 1, 1 ] );
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addLight( [ 2, 1, .5 ] );
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const bodyRadiusTop = .4;
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const bodyRadiusBottom = .2;
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const bodyHeight = 2;
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const bodyRadialSegments = 6;
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const bodyGeometry = new THREE.CylinderGeometry(
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bodyRadiusTop, bodyRadiusBottom, bodyHeight, bodyRadialSegments );
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const headRadius = bodyRadiusTop * 0.8;
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const headLonSegments = 12;
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const headLatSegments = 5;
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const headGeometry = new THREE.SphereGeometry(
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headRadius, headLonSegments, headLatSegments );
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const labelGeometry = new THREE.PlaneGeometry( 1, 1 );
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function makeLabelCanvas( baseWidth, size, name ) {
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const borderSize = 2;
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const ctx = document.createElement( 'canvas' ).getContext( '2d' );
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const font = `${size}px bold sans-serif`;
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ctx.font = font;
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// measure how long the name will be
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const textWidth = ctx.measureText( name ).width;
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const doubleBorderSize = borderSize * 2;
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const width = baseWidth + doubleBorderSize;
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const height = size + doubleBorderSize;
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ctx.canvas.width = width;
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ctx.canvas.height = height;
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// need to set font again after resizing canvas
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ctx.font = font;
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ctx.textBaseline = 'middle';
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ctx.textAlign = 'center';
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ctx.fillStyle = 'blue';
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ctx.fillRect( 0, 0, width, height );
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// scale to fit but don't stretch
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const scaleFactor = Math.min( 1, baseWidth / textWidth );
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ctx.translate( width / 2, height / 2 );
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ctx.scale( scaleFactor, 1 );
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ctx.fillStyle = 'white';
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ctx.fillText( name, 0, 0 );
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return ctx.canvas;
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}
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function makePerson( x, labelWidth, size, name, color ) {
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const canvas = makeLabelCanvas( labelWidth, size, name );
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const texture = new THREE.CanvasTexture( canvas );
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// because our canvas is likely not a power of 2
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// in both dimensions set the filtering appropriately.
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texture.minFilter = THREE.LinearFilter;
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texture.wrapS = THREE.ClampToEdgeWrapping;
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texture.wrapT = THREE.ClampToEdgeWrapping;
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const labelMaterial = new THREE.MeshBasicMaterial( {
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map: texture,
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side: THREE.DoubleSide,
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transparent: true,
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} );
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const bodyMaterial = new THREE.MeshPhongMaterial( {
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color,
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flatShading: true,
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} );
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const root = new THREE.Object3D();
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root.position.x = x;
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const body = new THREE.Mesh( bodyGeometry, bodyMaterial );
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root.add( body );
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body.position.y = bodyHeight / 2;
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const head = new THREE.Mesh( headGeometry, bodyMaterial );
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root.add( head );
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head.position.y = bodyHeight + headRadius * 1.1;
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const label = new THREE.Mesh( labelGeometry, labelMaterial );
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root.add( label );
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label.position.y = bodyHeight * 4 / 5;
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label.position.z = bodyRadiusTop * 1.01;
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// if units are meters then 0.01 here makes size
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// of the label into centimeters.
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const labelBaseScale = 0.01;
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label.scale.x = canvas.width * labelBaseScale;
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label.scale.y = canvas.height * labelBaseScale;
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scene.add( root );
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return root;
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}
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makePerson( - 3, 150, 32, 'Purple People Eater', 'purple' );
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makePerson( - 0, 150, 32, 'Green Machine', 'green' );
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makePerson( + 3, 150, 32, 'Red Menace', 'red' );
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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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function render() {
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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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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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