React + Threejs + Swiper 實(shí)現全景圖效果的完整代碼

  咱先看看全景圖實(shí)現效果：
  截圖：

  體驗了一下是不是感覺(jué)周?chē)h(huán)境轉了一圈，感覺(jué)世界是圓的？😁
  沒(méi)錯！恭喜你答對了！地球就是圓的！👀

全景效果實(shí)現

  有了上面的提示，對 threejs 有一點(diǎn)了解的小伙伴可能就猜出來(lái)了，這個(gè)全景效果其實(shí)就是使用一個(gè)球體實(shí)現的~ 而我們只是在球體內表面上貼了一張紋理貼圖而已（滾輪向外滾就可以看到這個(gè)球體了，看上去像個(gè)玻璃球，怪好看的，還有個(gè)彩蛋😁（好吧，說(shuō)出來(lái)就不是彩蛋了））：

  初始時(shí)，我們的視角在球體正中心，視角的移動(dòng)則是依靠 threejs 提供的工具 OrbitControls 來(lái)控制。

  那么創(chuàng )建這個(gè)球體的代碼如下：

const geometry = new THREE.SphereBufferGeometry(500, 32, 32);
geometry.scale(-1, 1, 1);   // 將紋理反貼
const material = new THREE.MeshBasicMaterial({
    map: new THREE.TextureLoader().load(imglist[0].default)	// 傳入圖片的URL或者路徑，也可以是 Data URI.
});
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);

const controls = new OrbitControls(camera, renderer.domElement);
controls.enablePan = false;
controls.maxDistance = 1000;

不知道 Data URI 是什么的可以看看 文檔

輪播圖

  輪播圖實(shí)現則是使用 這個(gè)庫，使用起來(lái)非常方便，具體可自行查閱文檔。
  在滑動(dòng)輪播圖時(shí)，會(huì )觸發(fā)一個(gè) onSliderChange 事件，這個(gè)事件傳入當前的 swiper 作為參數，我們就可以通過(guò)當前激活的元素來(lái)獲取圖片并替換球體的紋理貼圖了：

onSliderChange = curSwiper => {
    const mesh = this.mesh;
    const texture = imglist[curSwiper.activeIndex].default;
    mesh.material.map = new THREE.TextureLoader().load(texture);
};

  下面是我的 swiper 設置，其中 SwiperSlider 是一個(gè)可滑動(dòng)的輪播圖卡片，EffectCoverflow 是滑動(dòng)時(shí)觸發(fā)的效果，swiper 中提供了四種可選效果：Fade、Coverflow、Flip 以及 Cube。imglist 則是一組圖片，其中 imglist[i].default 屬性保存了圖片的 base64 編碼。

import { Swiper, SwiperSlide } from 'swiper/react';
import SwiperCore, { EffectCoverflow } from 'swiper';
import 'swiper/swiper.min.css';
import 'swiper/components/effect-coverflow/effect-coverflow.min.css';

SwiperCore.use([EffectCoverflow]);

//....
<Swiper
    className='panoramic-imgs'
    spaceBetween={50}	// 間距
    slidesPerView={3}	// 輪播圖里可預覽圖片數
    onSlideChange={this.onSliderChange}	// 滑動(dòng)時(shí)觸發(fā)的回調
    onSwiper={(swiper) => console.log(swiper)}	// 初始加載時(shí)觸發(fā)的回調
    direction='vertical'	// 輪播圖方向，默認是水平 horizontal
    effect={'coverflow'}	// 滑動(dòng)效果
    grabCursor={true}	// 鼠標放在輪播圖上是否顯示拖拽
    centeredSlides={true}	// 當前處于激活狀態(tài)的圖片是否要居中
    coverflowEffect={{	// coverflow 效果參數設置，可自行調整
        "rotate": 50,
        "stretch": 0,
        "depth": 100,
        "modifier": 1,
        "slideShadows": true
    }}
    {
        imglist.map((img, idx) => {
            return <SwiperSlide key={idx}>
                <img src={img.default} className='panoramic-img'></img>
            </SwiperSlide>
        })
    }
</Swiper>

  全景效果的實(shí)現就說(shuō)到這了，當然，如果什么地方有疑問(wèn)可以留言或者參考我的代碼（下面貼出來(lái)），只要對 threejs 和 react 有一定了解的同學(xué)我相信實(shí)現這么一個(gè)效果并不難，代碼量也很小~

完整代碼

import React, { Component } from 'react';

import Layout from '@theme/Layout';
import Head from '@docusaurus/Head';

import * as THREE from 'three';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls';
import * as _ from 'underscore';
import { message } from 'antd';

import { Swiper, SwiperSlide } from 'swiper/react';
import SwiperCore, { EffectCoverflow } from 'swiper';
import 'swiper/swiper.min.css';
import 'swiper/components/effect-coverflow/effect-coverflow.min.css';

import './index.css';
import imgs from './imgs.json';

SwiperCore.use([EffectCoverflow]);

const imglist = imgs.map(img => {
    return require('../../../static/img/panoramic/' + img.name);
});

export default class Panormatic extends Component {
    constructor() {
        super();
        this.renderer = null;
        this.camera = null;
        this.scene = null;
        this.container = null;
        this.controls = null;
        this.showMessage = true;    // 彩蛋提示
    }

    componentDidMount() {
        const container = document.getElementById('panoramic-canvas-container');
        const canvas = document.getElementById('panoramic-canvas');
        const renderer = new THREE.WebGLRenderer({ canvas, antialias: true });

        renderer.setClearColor(0xffffff);   // b2e0df 綠豆沙色
        renderer.setPixelRatio( window.devicePixelRatio );
        const height = container.clientHeight;
        const width = container.clientWidth;
        renderer.setSize(width, height);
        
        const camera = new THREE.PerspectiveCamera(60, width / height, 1, 30000);
        camera.position.set(0, 0, 1);
        camera.center = new THREE.Vector3(0, 0, 0);

        const scene = new THREE.Scene();

        const geometry = new THREE.SphereBufferGeometry(500, 32, 32);
        geometry.scale(-1, 1, 1);   // 將紋理反貼
        const material = new THREE.MeshBasicMaterial({
            map: new THREE.TextureLoader().load(imglist[0].default)
        });
        const mesh = new THREE.Mesh(geometry, material);
        scene.add(mesh);

        const controls = new OrbitControls(camera, renderer.domElement);
        // controls.enableZoom = false;
        controls.enablePan = false;
        controls.maxDistance = 1000;

        this.renderer = renderer;
        this.camera = camera;
        this.scene = scene;
        this.container = container;
        this.controls = controls;
        this.mesh = mesh;

        // 設置提示框的全局配置
        message.config({
            top: 100,
            duration: 3.5,
            maxCount: 1,
        });

        this.onControlsChange = _.throttle(this.onChange, 100);
        controls.addEventListener('change', this.onControlsChange);
        window.addEventListener('resize', this.onWindowResize);
        this.renderLoop();
    }

    componentWillUnmount() {
        const mesh = this.mesh;
        mesh.material.dispose();
        mesh.geometry.dispose();
        this.scene.remove(mesh);
        window.removeEventListener('resize', this.onWindowResize);
        this.controls.removeEventListener('change', this.onControlsChange);
        message.destroy();
    }

    onChange = (e) => {
        const camera = this.camera;
        if (camera.position.distanceTo(camera.center) >= 700) {
            if (this.showMessage) {
                message.success('🎊恭喜你發(fā)現了全景效果的小秘密~🎉');
                this.showMessage = false;
            }
        } else {
            this.showMessage = true;
        }
    }

    onSliderChange = (curSwiper) => {
        const mesh = this.mesh;
        const texture = imglist[curSwiper.activeIndex].default;
        mesh.material.map = new THREE.TextureLoader().load(texture);
    };

    onWindowResize = () => {
        const camera = this.camera;
        const renderer = this.renderer;
        const width = this.container.clientWidth;
        const height = this.container.clientHeight;
        
        camera.aspect = width / height;
        camera.updateProjectionMatrix();
        
        renderer.setSize(width, height);
    };

    renderLoop = () => {
        this.renderer.render(this.scene, this.camera);
        requestAnimationFrame(this.renderLoop);
    };

    render() {
        return (
            <Layout>
                <Head>
                    <title>全景圖 | Yle</title>
                </Head>
                <div id='panoramic-container'>
                    <Swiper
                        className='panoramic-imgs'
                        spaceBetween={50}
                        slidesPerView={3}
                        onSlideChange={this.onSliderChange}
                        onSwiper={(swiper) => console.log(swiper)}
                        direction='vertical'
                        effect={'coverflow'}
                        grabCursor={true}
                        centeredSlides={true}
                        coverflowEffect={{
                            "rotate": 50,
                            "stretch": 0,
                            "depth": 100,
                            "modifier": 1,
                            "slideShadows": true
                        }}
                    >
                        {
                            imglist.map((img, idx) => {
                                return <SwiperSlide key={idx}>
                                    <img src={img.default} className='panoramic-img'></img>
                                </SwiperSlide>
                            })
                        }
                    </Swiper>
                    <div id='panoramic-canvas-container'>
                        <canvas id='panoramic-canvas'></canvas>
                    </div>
                </div>
                
                
            </Layout>
        );
    }
}

到此這篇關(guān)于React + Threejs + Swiper 實(shí)現全景圖效果的完整代碼的文章就介紹到這了,更多相關(guān)React全景圖內容請搜索腳本之家以前的文章或繼續瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！