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166 lines
3.5 KiB
HTML
166 lines
3.5 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 - PreserveDrawingBuffer</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( {
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canvas,
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preserveDrawingBuffer: true,
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alpha: true,
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antialias: true
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} );
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renderer.autoClearColor = false;
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const camera = new THREE.OrthographicCamera( - 2, 2, 1, - 1, - 1, 1 );
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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 base = new THREE.Object3D();
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scene.add( base );
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base.scale.set( 0.1, 0.1, 0.1 );
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function makeInstance( geometry, color, x, y, z ) {
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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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base.add( cube );
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cube.position.set( x, y, z );
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return cube;
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}
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makeInstance( geometry, '#F00', - 2, 0, 0 );
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makeInstance( geometry, '#FF0', 2, 0, 0 );
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makeInstance( geometry, '#0F0', 0, - 2, 0 );
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makeInstance( geometry, '#0FF', 0, 2, 0 );
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makeInstance( geometry, '#00F', 0, 0, - 2 );
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makeInstance( geometry, '#F0F', 0, 0, 2 );
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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 state = { x: 0, y: 0 };
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function render( time ) {
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time *= 0.001; // convert to seconds
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if ( resizeRendererToDisplaySize( renderer ) ) {
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const canvas = renderer.domElement;
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camera.right = canvas.clientWidth / canvas.clientHeight;
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camera.left = - camera.right;
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camera.updateProjectionMatrix();
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}
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base.position.set( state.x, state.y, 0 );
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base.rotation.x = time;
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base.rotation.y = time * 1.11;
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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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function getCanvasRelativePosition( event ) {
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const rect = canvas.getBoundingClientRect();
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return {
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x: ( event.clientX - rect.left ) * canvas.width / rect.width,
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y: ( event.clientY - rect.top ) * canvas.height / rect.height,
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};
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}
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const temp = new THREE.Vector3();
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function setPosition( e ) {
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const pos = getCanvasRelativePosition( e );
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const x = pos.x / canvas.width * 2 - 1;
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const y = pos.y / canvas.height * - 2 + 1;
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temp.set( x, y, 0 ).unproject( camera );
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state.x = temp.x;
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state.y = temp.y;
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}
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canvas.addEventListener( 'mousemove', setPosition );
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canvas.addEventListener( 'touchmove', ( e ) => {
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e.preventDefault();
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setPosition( e.touches[ 0 ] );
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}, { passive: false } );
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}
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main();
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</script>
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</html>
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