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threejs全景图和锚点编辑的实现方案

前端开发
2024-03-01

让我来为您详细讲解“threejs全景图和锚点编辑的实现方案”吧。

让我来为您详细讲解“threejs全景图和锚点编辑的实现方案”吧。

前言

在讲解实现方案前，需要了解一下全景图和锚点的基本概念。

什么是全景图？

全景图是一种圆形或球形的图像，可以通过鼠标或手指的滑动来改变视角，从而可以在360度范围内观察场景中的所有细节，给人带来身临其境的感觉。

什么是锚点？

锚点是指在全景图中设置的一个或多个可点击的点，当用户点击锚点时，可以跳转到另一个全景图、网页或实现其他操作。

了解了这些基础概念后，下面就可以开始讲解实现方案了。

实现方案

1. 准备工作

在实现全景图和锚点编辑之前，需要先初始化three.js场景，并加载全景图。

var scene = new THREE.Scene();

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

// 创建相机
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 0, 0);

// 创建全景图物体
var texture = new THREE.TextureLoader().load('panorama.jpg');
var geometry = new THREE.SphereGeometry(500, 60, 60);
var material = new THREE.MeshBasicMaterial({ map: texture, side: THREE.DoubleSide });
var sphere = new THREE.Mesh(geometry, material);
sphere.position.set(0, 0, 0);
scene.add(sphere);

2. 实现全景图交互

为了实现全景图的交互功能，我们需要监听鼠标或手指的事件，根据相应的输入，改变相机的位置和方向。

// 监听鼠标拖拽事件
var isDragging = false;
var lastX, lastY;
document.addEventListener('mousedown', function (event) {
    isDragging = true;
    lastX = event.clientX;
    lastY = event.clientY;
});
document.addEventListener('mousemove', function (event) {
    if (isDragging) {
        var deltaX = event.clientX - lastX;
        var deltaY = event.clientY - lastY;
        camera.rotation.y += deltaX * 0.01;
        camera.rotation.x += deltaY * 0.01;
        lastX = event.clientX;
        lastY = event.clientY;
    }
});
document.addEventListener('mouseup', function (event) {
    isDragging = false;
});

// 监听触摸事件
var touchStartX, touchStartY;
document.addEventListener('touchstart', function (event) {
    if (event.touches.length == 1) {
        touchStartX = event.touches[0].clientX;
        touchStartY = event.touches[0].clientY;
    }
});
document.addEventListener('touchmove', function (event) {
    if (event.touches.length == 1) {
        var deltaX = event.touches[0].clientX - touchStartX;
        var deltaY = event.touches[0].clientY - touchStartY;
        camera.rotation.y += deltaX * 0.01;
        camera.rotation.x += deltaY * 0.01;
        touchStartX = event.touches[0].clientX;
        touchStartY = event.touches[0].clientY;
    }
});

3. 实现锚点

在全景图中添加锚点，需要先确定锚点的位置，然后创建一个可点击的元素，并绑定相应的事件。

// 创建锚点
var anchor = document.createElement('div');
anchor.className = 'anchor';
anchor.style.left = '50%';
anchor.style.top = '50%';

// 绑定锚点点击事件
anchor.addEventListener('click', function () {
    // TODO: 跳转到另一个全景图或网页
});

// 将锚点添加到DOM元素中
document.body.appendChild(anchor);

4. 实现锚点编辑器

为了方便添加和编辑锚点，可以创建一个锚点编辑器，允许用户在全景图中选择锚点的位置，并设置相关信息。

// 创建锚点编辑器
var anchorEditor = document.createElement('div');
anchorEditor.className = 'anchor-editor';
anchorEditor.style.display = 'none';

// 绑定锚点点击事件
sphere.addEventListener('mousedown', function (event) {
    var raycaster = new THREE.Raycaster();
    raycaster.setFromCamera(new THREE.Vector2((event.clientX / window.innerWidth) * 2 - 1, -(event.clientY / window.innerHeight) * 2 + 1), camera);
    var intersects = raycaster.intersectObjects([sphere]);
    if (intersects.length > 0) {
        var anchorX = (event.clientX / window.innerWidth) * 100;
        var anchorY = (event.clientY / window.innerHeight) * 100;
        showAnchorEditor(anchorX, anchorY);
    }
});

// 将锚点编辑器添加到DOM元素中
document.body.appendChild(anchorEditor);

// 显示锚点编辑器
function showAnchorEditor(anchorX, anchorY) {
    anchorEditor.style.display = 'block';
    anchorEditor.style.left = anchorX + '%';
    anchorEditor.style.top = anchorY + '%';
}

// 隐藏锚点编辑器
function hideAnchorEditor() {
    anchorEditor.style.display = 'none';
}

以上就是“threejs全景图和锚点编辑的实现方案”的攻略，希望对您有所帮助。

示例说明

示例一：浏览全景图

在这个示例中，我们使用three.js加载一张全景图，并实现用户的交互操作，让用户可以自由浏览全景图。

var scene = new THREE.Scene();

var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 0, 0);

var texture = new THREE.TextureLoader().load('panorama.jpg');
var geometry = new THREE.SphereGeometry(500, 60, 60);
var material = new THREE.MeshBasicMaterial({ map: texture, side: THREE.DoubleSide });
var sphere = new THREE.Mesh(geometry, material);
sphere.position.set(0, 0, 0);
scene.add(sphere);

var isDragging = false;
var lastX, lastY;
document.addEventListener('mousedown', function (event) {
    isDragging = true;
    lastX = event.clientX;
    lastY = event.clientY;
});
document.addEventListener('mousemove', function (event) {
    if (isDragging) {
        var deltaX = event.clientX - lastX;
        var deltaY = event.clientY - lastY;
        camera.rotation.y += deltaX * 0.01;
        camera.rotation.x += deltaY * 0.01;
        lastX = event.clientX;
        lastY = event.clientY;
    }
});
document.addEventListener('mouseup', function (event) {
    isDragging = false;
});

var touchStartX, touchStartY;
document.addEventListener('touchstart', function (event) {
    if (event.touches.length == 1) {
        touchStartX = event.touches[0].clientX;
        touchStartY = event.touches[0].clientY;
    }
});
document.addEventListener('touchmove', function (event) {
    if (event.touches.length == 1) {
        var deltaX = event.touches[0].clientX - touchStartX;
        var deltaY = event.touches[0].clientY - touchStartY;
        camera.rotation.y += deltaX * 0.01;
        camera.rotation.x += deltaY * 0.01;
        touchStartX = event.touches[0].clientX;
        touchStartY = event.touches[0].clientY;
    }
});

function animate() {
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}
animate();

示例二：添加锚点

在这个示例中，我们将整个全景图分为9个区域，并在每个区域里添加一个锚点。当用户点击锚点时，会提示相应的区域信息。

var scene = new THREE.Scene();

var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 0, 0);

var texture = new THREE.TextureLoader().load('panorama.jpg');
var geometry = new THREE.SphereGeometry(500, 60, 60);
var material = new THREE.MeshBasicMaterial({ map: texture, side: THREE.DoubleSide });
var sphere = new THREE.Mesh(geometry, material);
sphere.position.set(0, 0, 0);
scene.add(sphere);

var anchors = [
    { x: 25, y: 35, message: '区域1' },
    { x: 50, y: 35, message: '区域2' },
    { x: 75, y: 35, message: '区域3' },
    { x: 25, y: 50, message: '区域4' },
    { x: 50, y: 50, message: '区域5' },
    { x: 75, y: 50, message: '区域6' },
    { x: 25, y: 65, message: '区域7' },
    { x: 50, y: 65, message: '区域8' },
    { x: 75, y: 65, message: '区域9' },
];

var isDragging = false;
var lastX, lastY;
document.addEventListener('mousedown', function (event) {
    isDragging = true;
    lastX = event.clientX;
    lastY = event.clientY;
});
document.addEventListener('mousemove', function (event) {
    if (isDragging) {
        var deltaX = event.clientX - lastX;
        var deltaY = event.clientY - lastY;
        camera.rotation.y += deltaX * 0.01;
        camera.rotation.x += deltaY * 0.01;
        lastX = event.clientX;
        lastY = event.clientY;
    }
});
document.addEventListener('mouseup', function (event) {
    isDragging = false;
});

var touchStartX, touchStartY;
document.addEventListener('touchstart', function (event) {
    if (event.touches.length == 1) {
        touchStartX = event.touches[0].clientX;
        touchStartY = event.touches[0].clientY;
    }
});
document.addEventListener('touchmove', function (event) {
    if (event.touches.length == 1) {
        var deltaX = event.touches[0].clientX - touchStartX;
        var deltaY = event.touches[0].clientY - touchStartY;
        camera.rotation.y += deltaX * 0.01;
        camera.rotation.x += deltaY * 0.01;
        touchStartX = event.touches[0].clientX;
        touchStartY = event.touches[0].clientY;
    }
});

anchors.forEach(function (anchor) {
    var elem = document.createElement('button');
    elem.className = 'anchor';
    elem.style.left = anchor.x + '%';
    elem.style.top = anchor.y + '%';
    elem.addEventListener('click', function () {
        alert(anchor.message);
    });
    document.body.appendChild(elem);
});

function animate() {
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}
animate();

这就是两个简单的示例，希望能为您提供帮助。

本文标题为：threejs全景图和锚点编辑的实现方案

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