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<!DOCTYPE html> <html lang="en"> <head> <title>three.js canvas - lines - random</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 { background-color: #000000; margin: 0px; overflow: hidden; } a { color:#0078ff; } </style> </head> <body> <script src="../build/three.js"></script> <script src="js/renderers/Projector.js"></script> <script src="js/renderers/CanvasRenderer.js"></script> <script> var mouseX = 0, mouseY = 0, windowHalfX = window.innerWidth / 2, windowHalfY = window.innerHeight / 2, SEPARATION = 200, AMOUNTX = 10, AMOUNTY = 10, camera, scene, renderer; init(); animate(); function init() { var container, separation = 100, amountX = 50, amountY = 50, particles, particle; container = document.createElement(‘div‘); document.body.appendChild(container); camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 10000 ); camera.position.z = 100; scene = new THREE.Scene(); renderer = new THREE.CanvasRenderer(); renderer.setPixelRatio( window.devicePixelRatio ); renderer.setSize( window.innerWidth, window.innerHeight ); container.appendChild( renderer.domElement ); // particles var PI2 = Math.PI * 2; var material = new THREE.SpriteCanvasMaterial( { color: 0x99ff99, //点的颜色 program: function ( context ) { context.beginPath(); context.arc( 0, 0, 0.5, 0, PI2, true ); //x,y,半径，startAngle,endAngle,anticlockwise context.fill(); } } ); var geometry = new THREE.Geometry(); for ( var i = 0; i < 100; i ++ ) { particle = new THREE.Sprite( material ); particle.position.x = Math.random()*2 - 1; //应该是在1-65535之间取值，再x2 particle.position.y = Math.random() *2 - 1; particle.position.z = Math.random() *2 - 1; particle.position.normalize(); particle.position.multiplyScalar( Math.random() * 10 + 450 );//在原有的基础上扩大这么多倍（10以内的随机数+450） particle.scale.x = particle.scale.y = 10; scene.add( particle ); geometry.vertices.push( particle.position ); } // lines var line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0xffffff, opacity: 0.5 } ) );//颜色，不透明度 scene.add( line ); document.addEventListener( ‘mousemove‘, onDocumentMouseMove, false ); document.addEventListener( ‘touchstart‘, onDocumentTouchStart, false ); //触屏设备 document.addEventListener( ‘touchmove‘, onDocumentTouchMove, false ); // window.addEventListener( ‘resize‘, onWindowResize, false ); } function onWindowResize() { windowHalfX = window.innerWidth / 2; windowHalfY = window.innerHeight / 2; camera.aspect = window.innerWidth / window.innerHeight; camera.updateProjectionMatrix(); renderer.setSize( window.innerWidth, window.innerHeight ); } // function onDocumentMouseMove(event) { mouseX = event.clientX - windowHalfX; mouseY = event.clientY - windowHalfY; } function onDocumentTouchStart( event ) { if ( event.touches.length > 1 ) { event.preventDefault(); mouseX = event.touches[ 0 ].pageX - windowHalfX; mouseY = event.touches[ 0 ].pageY - windowHalfY; } } function onDocumentTouchMove( event ) { if ( event.touches.length == 1 ) { event.preventDefault(); mouseX = event.touches[ 0 ].pageX - windowHalfX; mouseY = event.touches[ 0 ].pageY - windowHalfY; } } // function animate() { requestAnimationFrame( animate ); render(); } function render() { camera.position.x += ( mouseX - camera.position.x ) * .05; camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05; camera.lookAt( scene.position ); renderer.render( scene, camera ); } </script> </body> </html>
THREE.js代码备份——canvas_lines(随机点、画线)
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原文地址：http://www.cnblogs.com/ForRickHuan/p/5734346.html
