<!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>
