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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>GeoJson - Three - Earth</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<meta content="Jane" name="author" />
<meta content="GeoJson - Three - Earth" name="description" />
<style>
html {
width: 100%;
height: 100%;
}
body {
width: 100%;
height: 100%;
color: #808080;
font-family: Monospace;
font-size: 13px;
text-align: center;
background-color: #242430;
margin: 0px;
overflow: hidden;
}
#container {
width: 100%;
height: 100%;
}
#info {
position: absolute;
width: 100px;
right: 0;
bottom: 20px;
font-size: 14px;
}
#info>a {
color: #eee;
text-decoration: none;
}
</style>
</head>
<body>
<div id="info">
<a href="https://github.com/jiangyuzhen">By - 姜姜姜</a>
</div>
<div id="container"></div>
<script src="./libs/three.min.js"></script>
<script src="./libs/OrbitControls.js"></script>
<script src="https://cdn.bootcss.com/echarts/3.8.5/echarts.min.js"></script>
<script src="./data/world.js"></script>
<script src="./data/china.js"></script>
<script>
var camera, controls, scene, renderer;
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();
var directionalLight;
var earth;
var mapSize = {
width: 4096,
height: 2048
};
var mapCanvas, mapTexture;
init();
animate();
// 初始化echarts地图
function initMap() {
mapCanvas = document.createElement('canvas');
mapCanvas.width = mapSize.width;
mapCanvas.height = mapSize.height;
mapTexture = new THREE.Texture(mapCanvas);
var chart = echarts.init(mapCanvas);
option = {
backgroundColor: '#404a59',
series: [
{
type: 'map',
mapType: 'world',
label: {
emphasis: {
color: '#fff',
fontSize: 14
}
},
itemStyle: {
normal: {
areaColor: '#0B1036',
borderColor: {
type: 'linear',
x: 0,
y: 0,
x2: 0,
y2: 1,
colorStops: [{
offset: 0, color: 'red' // 0% 处的颜色
}, {
offset: 1, color: 'blue' // 100% 处的颜色
}],
globalCoord: false // 缺省为 false
}
},
emphasis: {
areaColor: 'red'
}
},
boundingCoords: [
// 定位左上角经纬度
[-180, 90],
// 定位右下角经纬度
[180, -90]
]
},
{
type: 'map',
mapType: 'china',
label: {
emphasis: {
color: '#fff',
fontSize: 14
}
},
itemStyle: {
normal: {
areaColor: '#323c48',
borderColor: '#5FE6C9'
},
emphasis: {
areaColor: 'red'
}
},
boundingCoords: [
// 定位左上角经纬度
[-180, 90],
// 定位右下角经纬度
[180, -90]
]
}
]
};
chart.setOption(option);
mapTexture.needsUpdate = true;
// 选中或移出时才更新贴图
// 内存向显存上传数据很慢，应该尽量减少贴图更新
chart.on('mouseover', function () {
mapTexture.needsUpdate = true;
});
chart.on('mouseout', function () {
mapTexture.needsUpdate = true;
});
}
// 初始化three.js场景
function initScene() {
var container = document.getElementById('container');
// 场景
scene = new THREE.Scene();
// 相机
camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.z = -600;
// 渲染器
renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0x242430);
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
container.appendChild(renderer.domElement);
// 控制器
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.1;
controls.enablePan = false;
controls.rotateSpeed = 0.4;
// 平行光
directionalLight = new THREE.DirectionalLight(0xffffff, 0.9);
scene.add(directionalLight);
// 环境光
var light = new THREE.AmbientLight(0x202020);
scene.add(light);
// 地球
var earthGeometry = new THREE.SphereBufferGeometry(200, 36, 36);
var earthMaterial = new THREE.MeshLambertMaterial({ map: mapTexture, color: 0xffffff });
earth = new THREE.Mesh(earthGeometry, earthMaterial);
scene.add(earth);
}
function init() {
initMap();
initScene();
window.addEventListener('resize', onWindowResize, false);
container.addEventListener('mousemove', onMouseMove, false);
}
function onMouseMove(event) {
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = - (event.clientY / window.innerHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera); // 通过鼠标坐标和相机位置构造射线
var intersected = raycaster.intersectObject(earth); // 获取射线和地球的相交点
if (intersected && intersected.length > 0) {
// 根据射线相交点的uv反算出在canvas上的坐标
var x = intersected[0].uv.x * mapSize.width;
var y = mapSize.height - intersected[0].uv.y * mapSize.height;
// 在mapCanvas上模拟鼠标事件，这里或许有更好的方法
var virtualEvent = document.createEvent('MouseEvents');
virtualEvent.initMouseEvent('mousemove', false, true, document.defaultView, 1, x, y, x, y, false, false, false, false, 0, null);
mapCanvas.dispatchEvent(virtualEvent);
}
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
requestAnimationFrame(animate); // 循环渲染
controls.update();
render();
}
function render() {
// 平行光始终从相机位置照向地球
directionalLight.position.copy(camera.position)
renderer.render(scene, camera);
}
</script>
</body>
</html>