用threejs实现三维全景图
网络上看到了3D全景图，发现threejs里面有一个库竟然可以实现，一下我贴出代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<title>three.js css3d - panorama</title>
<style>
body {
background-color: #000000;
margin: 0;
cursor: move;
overflow: hidden;
}
a {
color: #ffffff;
}
#info {
position: absolute;
width: 100%;
color: #ffffff;
padding: 5px;
font-family: Monospace;
font-size: 13px;
font-weight: bold;
text-align: center;
z-index: 1;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script> <!-- 此处引入threejs基础类 -->
<script src="js/renderers/CSS3DRenderer.js"></script> <!-- 此处引入CSS3Drenderer.js类 -->
<!-- 以上两个文件，在下载threejs的时候就有的，引入就好 -->
<script>
var camera, scene, renderer;
var geometry, material, mesh;
var target = new THREE.Vector3();
var lon = 90, lat = 0;
var phi = 0, theta = 0;
var touchX, touchY;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 1000 );
scene = new THREE.Scene();
/** 次数是重点说明的
* 这个sides对应的是六张图位于立体坐标轴内的位置，里面的position又包含x,y,三个轴
* 然后ratation是三个轴上的变换
*/
var sides = [
{
position: [ 512, 0, 0 ], // 1
rotation: [ 0, -Math.PI / 2, 0 ]
},
{
position: [ -512, 0, 0 ], // 2
rotation: [ 0, Math.PI / 2, 0 ]
},
{
position: [ 0, 512, 0 ], // 3
rotation: [ Math.PI / 2, 0, Math.PI ]
},
{
position: [ 0, -512, 0 ], // 4
rotation: [ - Math.PI / 2, 0, Math.PI ]
},
{
position: [ 0, 0, 512 ], // 5
rotation: [ 0, Math.PI, 0 ]
},
{
position: [ 0, 0, -512 ], // 6
rotation: [ 0, 0, 0 ]
}
];
var canvas = document.createElement('canvas');
var image = document.createElement('img');
image.src = 'picture/360photos.jpg'; // 画图，这里引入的这张图片，是一张图上集合了6张图片
image.height = 6144;
image.width = 1024;
canvas.width = 1024;
canvas.height = 1024;
// 这里有判断image.onload，这里是判断创建的image节点是否把引入的图片加载进来
image.onload = function() {
for ( var i = 0; i < sides.length; i ++ ) { // 由于是六张图放在一张图片上，然后这里分割六张图片
var cxt = canvas.getContext("2d");
cxt.drawImage(image, 0, -1024*i);
var side = sides[ i ];
var element = document.createElement( 'img' );
element.width = 1026; // 2 pixels extra to close the gap.
document.getElementsByTagName('body')[0].appendChild(canvas);
var _img_url = canvas.toDataURL("image/png"); // 获取图片位置
element.src = _img_url;
var object = new THREE.CSS3DObject( element ); // 这里根据sides把图片放在坐标轴上进行渲染
object.position.fromArray( side.position );
object.rotation.fromArray( side.rotation );
scene.add( object );
}
}
renderer = new THREE.CSS3DRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
//
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'mousewheel', onDocumentMouseWheel, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseDown( event ) {
event.preventDefault();
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
}
function onDocumentMouseMove( event ) {
var movementX = event.movementX || event.mozMovementX || event.webkitMovementX || 0;
var movementY = event.movementY || event.mozMovementY || event.webkitMovementY || 0;
lon -= movementX * 0.1;
lat += movementY * 0.1;
}
function onDocumentMouseUp( event ) {
document.removeEventListener( 'mousemove', onDocumentMouseMove );
document.removeEventListener( 'mouseup', onDocumentMouseUp );
}
function onDocumentMouseWheel( event ) {
camera.fov -= event.wheelDeltaY * 0.05;
camera.updateProjectionMatrix();
}
function onDocumentTouchStart( event ) {
event.preventDefault();
var touch = event.touches[ 0 ];
touchX = touch.screenX;
touchY = touch.screenY;
}
function onDocumentTouchMove( event ) {
event.preventDefault();
var touch = event.touches[ 0 ];
lon -= ( touch.screenX - touchX ) * 0.1;
lat += ( touch.screenY - touchY ) * 0.1;
touchX = touch.screenX;
touchY = touch.screenY;
}
function animate() {
requestAnimationFrame( animate );
lon += 0.1;
lat = Math.max( - 85, Math.min( 85, lat ) );
phi = THREE.Math.degToRad( 90 - lat );
theta = THREE.Math.degToRad( lon );
target.x = Math.sin( phi ) * Math.cos( theta );
target.y = Math.cos( phi );
target.z = Math.sin( phi ) * Math.sin( theta );
camera.lookAt( target );
renderer.render( scene, camera );
}
</script>
</body>
</html>
