javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js canvas - interactive sprites</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}
		</style>
	</head>
	<body>

		<script src="../build/three.js"></script>

		<script src="js/renderers/Projector.js"></script>
		<script src="js/renderers/CanvasRenderer.js"></script>

		<script src="js/libs/stats.min.js"></script>

		<script>

			var container, stats;
			var camera, scene, renderer;

			var raycaster;
			var mouse;

			var PI2 = Math.PI * 2;

			/*
			function programFill( context ) {

				context.fillRect( - 0.5, - 0.5, 1, 1 );

			}

			function programStroke( context ) {

				context.lineWidth = 0.025;
				context.strokeRect( - 0.5, - 0.5, 1, 1 );

			}
			*/

			function programFill( context ) {

				context.beginPath();
				context.arc( 0, 0, 0.5, 0, PI2, true );
				context.fill();

			}

			function programStroke( context ) {

				context.lineWidth = 0.025;
				context.beginPath();
				context.arc( 0, 0, 0.5, 0, PI2, true );
				context.stroke();

			}

			var INTERSECTED;

			init();
			animate();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				var info = document.createElement( 'div' );
				info.style.position = 'absolute';
				info.style.top = '10px';
				info.style.width = '100%';
				info.style.textAlign = 'center';
				info.innerHTML = '<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> canvas - interactive sprites';
				container.appendChild( info );

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.set( 0, 300, 500 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xf0f0f0 );

				for ( var i = 0; i < 100; i ++ ) {

					var material = new THREE.SpriteCanvasMaterial( {
						color: Math.random() * 0x808080 + 0x808080,
						program: programStroke
					} );

					var sprite = new THREE.Sprite( material );
					sprite.position.x = Math.random() * 800 - 400;
					sprite.position.y = Math.random() * 800 - 400;
					sprite.position.z = Math.random() * 800 - 400;
					sprite.scale.setScalar( Math.random() * 20 + 20 );
					scene.add( sprite );

				}

				//

				raycaster = new THREE.Raycaster();
				mouse = new THREE.Vector2();

				renderer = new THREE.CanvasRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				stats = new Stats();
				container.appendChild( stats.dom );

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function onDocumentMouseMove( event ) {

				event.preventDefault();

				mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
				mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			var radius = 600;
			var theta = 0;

			function render() {

				// rotate camera

				theta += 0.1;

				camera.position.x = radius * Math.sin( THREE.Math.degToRad( theta ) );
				camera.position.y = radius * Math.sin( THREE.Math.degToRad( theta ) );
				camera.position.z = radius * Math.cos( THREE.Math.degToRad( theta ) );
				camera.lookAt( scene.position );

				camera.updateMatrixWorld();

				// find intersections

				raycaster.setFromCamera( mouse, camera );

				var intersects = raycaster.intersectObjects( scene.children );

				if ( intersects.length > 0 ) {

					var object = intersects[ 0 ].object;

					if ( INTERSECTED !== object ) {

						if ( INTERSECTED ) INTERSECTED.material.program = programStroke;

						INTERSECTED = object;
						INTERSECTED.material.program = programFill;

					}

				} else if ( INTERSECTED ) {

					INTERSECTED.material.program = programStroke;
					INTERSECTED = null;

				}

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>