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Use JavaScript and Tencent Maps to implement map 3D flight effect function

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Nov 21, 2023 pm 02:00 PM

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Use JavaScript and Tencent Maps to implement map 3D flight effect function

Use JavaScript and Tencent Maps to realize the 3D map flight effect function

Introduction
In modern web applications, how to use JavaScript and Tencent Maps to realize the 3D map flight effect Functionality is a hot topic. This feature can provide users with an interactive experience that is different from traditional two-dimensional maps, allowing them to gain a deeper understanding of geographic information. This article will introduce how to use the Three.js library and Tencent Map API in JavaScript to achieve a simple map 3D flight effect.

Preparation
Before we start writing code, we need to prepare some necessary tools and resources. First, we need an access key with a Tencent Maps developer account, which will be used to obtain map data. Then, we need to download the latest version of the Three.js library, which is used to create and render 3D scenes. Finally, we need some basic knowledge of HTML and CSS to be able to create a simple web page.
HTML structure
First, we need to create an HTML page and introduce the Three.js library and Tencent Map API inside it. We also need to create a div element for the map container to hold the map.

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>地图3D飞行效果</title>
    <style>
        #mapContainer {
            width: 100vw;
            height: 100vh;
        }
    </style>
</head>

<body>
    <div id="mapContainer"></div>

    <script src="https://cdn.bootcdn.net/ajax/libs/three.js/110/three.min.js"></script>
    <script src="https://map.qq.com/api/js?v=2.exp&key=your_api_key"></script>
    <script src="app.js"></script>
</body>

</html>

JavaScript code
Next, we need to create a JavaScript file named "app.js" and write the code to achieve the 3D flight effect of the map. First, we need to create a Three.js scene and set up the camera and light source. Then, we need to get the map data from the Tencent Map API and convert it into an object in Three.js. Finally, we can use the animation capabilities provided by Three.js to fly the camera from one location to another.

// 创建Three.js场景
const scene = new THREE.Scene();

// 创建相机
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = 5;

// 创建光源
const light = new THREE.HemisphereLight(0xffffff, 0x000000, 1);
scene.add(light);

// 创建渲染器
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 腾讯地图API获取地理坐标数据
const map = new qq.maps.Map(document.getElementById("mapContainer"), {
    center: new qq.maps.LatLng(23.1291, 113.2644),
    zoom: 14,
    draggable: false
});

// 将地理坐标转换为Three.js中的坐标
function convertToThreeJsLatLng(latLng) {
    const x = latLng.getLng();
    const y = latLng.getLat();
    return new THREE.Vector3(x, 0, y);
}

// 飞行函数
function flyTo(target) {
    const start = camera.position.clone(); // 获取当前相机位置
    const end = convertToThreeJsLatLng(target); // 将目标地理坐标转换为Three.js坐标

    const distance = start.distanceTo(end); // 计算相机与目标之间的距离
    const duration = distance * 1000; // 根据距离计算飞行时间

    // 使用Tween.js创建动画效果
    new TWEEN.Tween(start)
        .to(end, duration)
        .onUpdate(() => {
            camera.position.copy(start);
        })
        .start();
}

// 动画循环
function animate() {
    requestAnimationFrame(animate);
    TWEEN.update();
    renderer.render(scene, camera);
}

// 初始化飞行
function init() {
    // 添加目标点
    const target = new qq.maps.LatLng(23.1469, 113.3318);
    map.setCenter(target);
    flyTo(target);

    animate();
}

// 页面加载完成后执行初始化函数
window.addEventListener("load", init);

Running effect
Open the HTML file in the browser and you will see a page with a map 3D flight effect. The camera will fly from the starting position to the target position, providing a dynamic visual experience. You can also customize the starting and target positions, and adjust the speed of flight.

Summary
This article introduces how to use JavaScript and Tencent Map API to implement the map 3D flight effect function. By using the Three.js library and Tencent Map API, we are able to create a map scene with dynamic flight effects. I hope this article is helpful for you to learn and understand this feature. If you have any questions or concerns, please feel free to leave a comment below.

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