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202 lines
4.0 KiB
HTML
202 lines
4.0 KiB
HTML
<!-- 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 Cube</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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}
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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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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 = 5;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.z = 2;
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const scene = new THREE.Scene();
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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 cubes = []; // just an array we can use to rotate the cubes
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const ctx = document.createElement( 'canvas' ).getContext( '2d' );
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ctx.canvas.width = 256;
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ctx.canvas.height = 256;
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ctx.fillStyle = '#FFF';
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ctx.fillRect( 0, 0, ctx.canvas.width, ctx.canvas.height );
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const texture = new THREE.CanvasTexture( ctx.canvas );
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const material = new THREE.MeshBasicMaterial( {
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map: texture,
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} );
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const cube = new THREE.Mesh( geometry, material );
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scene.add( cube );
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cubes.push( cube ); // add to our list of cubes to rotate
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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 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 randVelocity() {
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return rand( 2, 4 ) * ( rand( 2 ) < 1 ? - 1 : 1 );
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}
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const maxLines = 60;
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const points = [
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{ position: [ rand( 256 ), rand( 256 ) ], direction: [ randVelocity(), randVelocity() ] },
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{ position: [ rand( 256 ), rand( 256 ) ], direction: [ randVelocity(), randVelocity() ] },
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];
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const lineHistory = [];
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let lineCursor = 0;
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function drawCurrentLine() {
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const line = lineHistory[ lineCursor ];
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ctx.beginPath();
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ctx.moveTo( ...line[ 0 ] );
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ctx.lineTo( ...line[ 1 ] );
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ctx.stroke();
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}
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function drawLines( time ) {
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points.forEach( ( point ) => {
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point.position.forEach( ( position, ndx ) => {
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const newPosition = position + point.direction[ ndx ];
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if ( newPosition > 255 ) {
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point.direction[ ndx ] = rand( - 2, - 4 );
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} else if ( newPosition < 0 ) {
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point.direction[ ndx ] = rand( 2, 4 );
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}
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point.position[ ndx ] = newPosition;
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} );
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} );
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if ( lineHistory.length === maxLines ) {
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ctx.lineWidth = 3;
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ctx.strokeStyle = '#FFF';
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drawCurrentLine();
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}
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lineHistory[ lineCursor ] = points.map( point => point.position.slice() );
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ctx.lineWidth = 1;
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ctx.strokeStyle = hsl( time, 1, .5 );
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drawCurrentLine();
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lineCursor = ( lineCursor + 1 ) % maxLines;
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}
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function hsl( h, s, l ) {
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return `hsl(${h * 360 | 0},${s * 100 | 0}%,${l * 100 | 0}%)`;
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}
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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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drawLines( time * 0.1 );
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texture.needsUpdate = true;
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cubes.forEach( ( cube, ndx ) => {
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const speed = .2 + 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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} );
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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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