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155 lines
3.0 KiB
HTML
155 lines
3.0 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 - 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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