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213 lines
4.9 KiB
213 lines
4.9 KiB
3 years 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 - Debug - Params</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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#debug {
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position: absolute;
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left: 1em;
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top: 1em;
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padding: 1em;
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background: rgba(0, 0, 0, 0.9);
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color: white;
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font-family: monospace;
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pointer-events: none;
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}
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#info {
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position: absolute;
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right: 1em;
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bottom: 1em;
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padding: 1em;
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background: rgba(0, 0, 0, 0.9);
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color: white;
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font-family: monospace;
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pointer-events: none;
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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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<div id="debug" style="display: none;">
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<pre></pre>
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</div>
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<div id="info">click to launch</div>
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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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}
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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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/**
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* Returns the query parameters as a key/value object.
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* Example: If the query parameters are
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*
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* abc=123&def=456&name=gman
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*
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* Then `getQuery()` will return an object like
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*
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* {
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* abc: '123',
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* def: '456',
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* name: 'gman',
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* }
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*/
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function getQuery() {
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const params = {};
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const q = (window.location.search || '').substring(1);
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q.split('&').forEach((pair) => {
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const keyValue = pair.split('=').map(decodeURIComponent);
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params[keyValue[0]] = keyValue[1];
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});
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return params;
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}
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class DummyLogger {
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log() {}
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render() {}
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}
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class ClearingLogger {
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constructor(elem) {
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this.elem = elem;
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this.lines = [];
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}
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log(...args) {
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this.lines.push([...args].join(' '));
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}
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render() {
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this.elem.textContent = this.lines.join('\n');
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this.lines = [];
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}
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}
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const query = getQuery();
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const debug = query.debug === 'true';
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const logger = debug
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? new ClearingLogger(document.querySelector('#debug pre'))
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: new DummyLogger();
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if (debug) {
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document.querySelector('#debug').style.display = '';
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}
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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.z = 20;
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const scene = new THREE.Scene();
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scene.background = new THREE.Color('cyan');
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const geometry = new THREE.SphereGeometry();
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const material = new THREE.MeshBasicMaterial({color: 'red'});
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const things = [];
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function rand(min, max) {
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if (max === undefined) {
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max = min;
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min = 0;
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}
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return Math.random() * (max - min) + min;
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}
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function createThing() {
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const mesh = new THREE.Mesh(geometry, material);
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scene.add(mesh);
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things.push({
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mesh,
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timer: 2,
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velocity: new THREE.Vector3(rand(-5, 5), rand(-5, 5), rand(-5, 5)),
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});
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}
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canvas.addEventListener('click', createThing);
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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 then = 0;
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function render(now) {
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now *= 0.001; // convert to seconds
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const deltaTime = now - then;
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then = now;
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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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if (things.length === 0) {
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createThing();
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}
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logger.log('fps:', (1 / deltaTime).toFixed(1));
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logger.log('num things:', things.length);
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for (let i = 0; i < things.length;) {
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const thing = things[i];
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const mesh = thing.mesh;
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const pos = mesh.position;
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logger.log(
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'timer:', thing.timer.toFixed(3),
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'pos:', pos.x.toFixed(3), pos.y.toFixed(3), pos.z.toFixed(3));
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thing.timer -= deltaTime;
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if (thing.timer <= 0) {
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// remove this thing. Note we don't advance `i`
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things.splice(i, 1);
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scene.remove(mesh);
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} else {
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mesh.position.addScaledVector(thing.velocity, deltaTime);
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++i;
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}
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}
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renderer.render(scene, camera);
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logger.render();
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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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