<!DOCTYPE html>

<html lang="en">

<head>

    <title>three.js canvas - geometry - earth</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 {

            color: #808080;

            font-family:Monospace;

            font-size:13px;

            text-align:center;

            background-color: #ffffff;

            margin: 0px;

            overflow: hidden;

        }

        #info {

            position: absolute;

            top: 0px; width: 100%;

            padding: 5px;

        }

        a {

            color: #0080ff;

        }

    </style>

</head>

<body>

<div id="container"></div>

<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> - earth demo</div>

<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 group;

    var mouseX = 0, mouseY = 0;

    var windowHalfX = window.innerWidth / 2;

    var windowHalfY = window.innerHeight / 2;

    init();

    animate();

    function init() {

        container = document.getElementById( 'container' );

        camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 2000 );

        camera.position.z = 500;

        scene = new THREE.Scene();

        group = new THREE.Group();

        scene.add( group );

        // earth

        var loader = new THREE.TextureLoader();

        loader.load( 'textures/land_ocean_ice_cloud_2048.jpg', function ( texture ) {

            var geometry = new THREE.SphereGeometry( 200, 20, 20 );

            var material = new THREE.MeshBasicMaterial( { map: texture, overdraw: 0.5 } );

            var mesh = new THREE.Mesh( geometry, material );

            group.add( mesh );

        } );

        // shadow

        var canvas = document.createElement( 'canvas' );

        canvas.width = 128;

        canvas.height = 128;

        var context = canvas.getContext( '2d' );

        var gradient = context.createRadialGradient(

                canvas.width / 2,

                canvas.height / 2,

                0,

                canvas.width / 2,

                canvas.height / 2,

                canvas.width / 2

        );

        gradient.addColorStop( 0.1, 'rgba(210,210,210,1)' );  //0.1范围的灰色

        gradient.addColorStop( 1, 'rgba(255,255,255,1)' );    //整个范围的白色（相叠加达到影子的效果）

        context.fillStyle = gradient;

        context.fillRect( 0, 0, canvas.width, canvas.height );

        var texture = new THREE.CanvasTexture( canvas );

        var geometry = new THREE.PlaneBufferGeometry( 300, 300, 3, 3 );

        var material = new THREE.MeshBasicMaterial( { map: texture, overdraw:0.5 } );

        var mesh = new THREE.Mesh( geometry, material );

        mesh.position.y = - 250;

        mesh.rotation.x = - Math.PI / 2;

        group.add( mesh );

        renderer = new THREE.CanvasRenderer();

        renderer.setClearColor( 0xffffff );

        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() {

        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 animate() {

        requestAnimationFrame( animate );

        render();

        stats.update();

    }

    function render() {

        camera.position.x += ( mouseX - camera.position.x ) * 0.05;

        camera.position.y += ( - mouseY - camera.position.y ) * 0.05;

        camera.lookAt( scene.position );

        group.rotation.y -= 0.005;

        renderer.render( scene, camera );

    }

</script>

</body>

</html>

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