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146 lines
3.7 KiB
146 lines
3.7 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 - 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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<!-- 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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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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});
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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 = 1;
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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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