使用threejs 实现3D物体展示，平移实现类似百度地图功能

为了实现类似百度地图功能

使用threejs 实现3D物体，通过鼠标平移，缩放，键盘箭头按钮左右移动的功能展示。

<!DOCTYPE html>

<html>
<head>
<meta charset=utf-8>
<title>My first three.js app</title>
<style>
* { margin: 0; }
canvas { width: 100%; height: 100%;}
</style>
</head>
<body>
</body>
<script src="https://cdn.bootcss.com/three.js/91/three.js"></script>
<script>
var iswireframe = false;
var scene , camera , renderer;
var fov = 75, //拍摄距离视野角值越大，场景中的物体越小
near = 1,//相机离视体积最近的距离
far = 1000;//相机离视体积最远的距离;
var cameraX = 0, cameraY = 15, cameraZ = 8;
var sceneX = 0, sceneZ = 0;
document.body.style.cursor="move";
function initFloor(){
var floorGeometry = new THREE.BoxGeometry( 20, 0.01, 6);
//var material = new THREE.MeshBasicMaterial( { color: "green", wireframe : iswireframe } );
for ( var i = 0; i < floorGeometry.faces.length; i++ ) {
floorGeometry.faces[ i ].color.set( 0xEEEED1 );
}
var material = new THREE.MeshBasicMaterial( { vertexColors: THREE.FaceColors, wireframe : iswireframe } );
var floor = new THREE.Mesh( floorGeometry, material );
scene.add( floor );
}

function initGrid(){ //辅助网格
var helper = new THREE.GridHelper( 1000, 50 );
//helper.setColors( 0x0000ff, 0x808080 );
scene.add( helper );
}

function buildColor(geometry){
for ( let i = 0; i < geometry.faces.length; i++ ) {
geometry.faces[i].color.setHex( Math.random() * 0xffffff );
}
}

function initWall(){
let wallColor = 0xEBEBEB;
let wallHeight = 1;
let wallGeometryback = new THREE.BoxGeometry(20, wallHeight, 0.1);
console.log(wallGeometryback.faces.length);
//buildColor(wallGeometryback);
let materialParamertes = {color: wallColor, vertexColors: THREE.FaceColors, wireframe : iswireframe, opacity : 0.01};
var wallback = new THREE.Mesh(
wallGeometryback,
new THREE.MeshBasicMaterial(materialParamertes)
);
wallback.position.set(0, 0.5, -3);
scene.add(wallback);

let wallGeometryLeft = new THREE.BoxGeometry(0.1, wallHeight, 6);
var wallLeft = new THREE.Mesh(
wallGeometryLeft,
new THREE.MeshBasicMaterial(materialParamertes)
);
wallLeft.position.set(-10, 0.5, 0);
scene.add(wallLeft);

let wallGeometryRight = new THREE.BoxGeometry(0.1, wallHeight, 6);
var wallRight = new THREE.Mesh(
wallGeometryRight,
new THREE.MeshBasicMaterial(materialParamertes)
);
wallRight.position.set(10, 0.5, 0);
scene.add(wallRight);
/*
let wallGeometryFront = new THREE.BoxGeometry(20, wallHeight, 0.1);
var wallFront = new THREE.Mesh(
wallGeometryFront,
new THREE.MeshBasicMaterial(materialParamertes)
);
wallFront.position.set(0, 0.5, 3);
scene.add(wallFront);
*/
}

function onDocumentKeyDown(event){
switch(event.keyCode){
case 37: //左
cameraX -= 1;
sceneX -=1;
break;
case 39: //右
cameraX += 1;
sceneX +=1;
break;
case 38: //上
//fx -= 0.1;
cameraZ -= 1;
sceneZ -= 1;
break;
case 40: //下
//fx += 0.1;
cameraZ += 1;
sceneZ += 1;
break;
default:
break;
}
renderInit();
}

function onDocumentMouseDown(event) {
if (event.button != 0) return;
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;
//console.log("x="+movementX+" y="+movementY);
cameraX -= movementX * 0.01;
sceneX -= movementX * 0.01;
cameraZ -= movementY * 0.01;
sceneZ -= movementY * 0.01;
renderInit();
}

function onDocumentMouseUp(event) {
document.removeEventListener('mousemove', onDocumentMouseMove);
document.removeEventListener('mouseup', onDocumentMouseUp);
}

//场景初始化
function sceneInit(){
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( fov , window.innerWidth/window.innerHeight, near, far );
//camera.position.set(0, 0, 7);
//相机位置
//cameraX = 0; cameraZ = 8;
camera.up.x = 0;
camera.up.y = 1; //相机朝向--相机上方为y轴
camera.up.z = 0;

renderer = new THREE.WebGLRenderer({antialias : true});
renderer.setSize( window.innerWidth - 10, window.innerHeight -10 );
renderer.setClearColor(0xFFFFFF, 1.0);
document.body.appendChild( renderer.domElement );
renderer.setClearColor(0xFFFFFF, 1.0);

document.addEventListener('keydown',onDocumentKeyDown,false);
document.addEventListener('mousewheel', onDocumentMouseWheel, false);//兼容ie chrome
document.addEventListener('DOMMouseScroll', onDocumentMouseWheel, false);//兼容火狐
document.addEventListener('mousedown', onDocumentMouseDown, false);
initGrid();
initFloor();
initBuild1();
initWall();
}

function renderInit(){
camera.position.set(cameraX, cameraY, cameraZ);
camera.lookAt(sceneX, 0, sceneZ);
camera.updateProjectionMatrix();
renderer.render(scene, camera);
}

sceneInit();
renderInit();

//动画
function animate() {
requestAnimationFrame( animate );
// stats.begin();
initAll();
//stats.end();
}
</script>
</html>

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使用threejs 实现3D物体展示，平移实现类似百度地图功能

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