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191 lines
5.3 KiB
191 lines
5.3 KiB
<!-- 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 - Billboard Labels w/Sprites</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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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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({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 = 1;
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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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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.SpriteMaterial({
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map: texture,
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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.Sprite(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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