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124 lines
3.0 KiB
124 lines
3.0 KiB
2 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 - OffscreenCanvas Picking</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="module">
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import {state, init, pickPosition} from './shared-picking.js';
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let sendMouse;
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function startWorker(canvas) {
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const offscreen = canvas.transferControlToOffscreen();
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const worker = new Worker('offscreencanvas-worker-picking.js', {type: 'module'});
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worker.postMessage({type: 'init', canvas: offscreen}, [offscreen]);
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sendMouse = (x, y) => {
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worker.postMessage({
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type: 'mouse',
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x,
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y,
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});
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};
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function sendSize() {
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worker.postMessage({
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type: 'size',
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width: canvas.clientWidth,
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height: canvas.clientHeight,
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});
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}
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window.addEventListener('resize', sendSize);
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sendSize();
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console.log('using OffscreenCanvas'); /* eslint-disable-line no-console */
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}
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function startMainPage(canvas) {
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init({canvas});
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sendMouse = (x, y) => {
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pickPosition.x = x;
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pickPosition.y = y;
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};
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function sendSize() {
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state.width = canvas.clientWidth;
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state.height = canvas.clientHeight;
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}
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window.addEventListener('resize', sendSize);
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sendSize();
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console.log('using regular canvas'); /* eslint-disable-line no-console */
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}
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function main() { /* eslint consistent-return: 0 */
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const canvas = document.querySelector('#c');
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if (canvas.transferControlToOffscreen) {
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startWorker(canvas);
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} else {
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startMainPage(canvas);
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}
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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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function setPickPosition(event) {
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const pos = getCanvasRelativePosition(event);
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sendMouse(
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(pos.x / canvas.width ) * 2 - 1,
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(pos.y / canvas.height) * -2 + 1); // note we flip Y
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}
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function clearPickPosition() {
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// unlike the mouse which always has a position
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// if the user stops touching the screen we want
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// to stop picking. For now we just pick a value
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// unlikely to pick something
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sendMouse(-100000, -100000);
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}
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window.addEventListener('mousemove', setPickPosition);
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window.addEventListener('mouseout', clearPickPosition);
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window.addEventListener('mouseleave', clearPickPosition);
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window.addEventListener('touchstart', (event) => {
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// prevent the window from scrolling
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event.preventDefault();
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setPickPosition(event.touches[0]);
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}, {passive: false});
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window.addEventListener('touchmove', (event) => {
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setPickPosition(event.touches[0]);
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});
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window.addEventListener('touchend', clearPickPosition);
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}
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main();
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</script>
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</html>
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