【threejsJavascript】实现事件注册派送

本文主要是介绍【threejsJavascript】实现事件注册派送，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

实现类似dom操作中的事件注册

addEventListener，removeEventListener

目标class内

以事件管理器和点击事件为例

import { EventDispatcher, Raycaster, Vector2 } from "three";export class EventManage {mouse = new Vector2()raycaster = new Raycaster()domcamerascenelast = nulllistener = []/*** *  @param {HTMLElement} dom* @param {Camera} camera* @param {Scene} scene*/constructor(dom, camera, scene) {// super()this.dom = domthis.camera = camerathis.scene = sceneconst mouse = this.mouseconst raycaster = this.raycasterlet last = nulldom.addEventListener('mousemove', (e) => {mouse.x = e.offsetX / dom.offsetWidth * 2 - 1mouse.y = -e.offsetY * 2 / dom.offsetHeight + 1raycaster.setFromCamera(mouse, camera);const intersection = raycaster.intersectObjects(this.scene.children)if (intersection.length > 0) {// console.log(intersection[0]);let object = intersection[0].objectobject.dispatchEvent({type: 'mousemove',point: intersection[0].point})if (last && last.uuid == object.uuid) {} else {if (last)last.dispatchEvent({type: 'mouseout',point: intersection[0].point})object.dispatchEvent({type: 'mousein',point: intersection[0].point})}last = object}})dom.addEventListener('click', (e) => {raycaster.setFromCamera(mouse, camera);const intersection = raycaster.intersectObjects(this.scene.children)if (intersection.length > 0) {// console.log(intersection[0]);intersection[0].object.dispatchEvent({type: 'click',point: intersection[0].point})}let callbacks = this.listener.filter(item => item.name == 'click')if (callbacks.length > 0) {callbacks.forEach(({ callback }) => callback({object: intersection[0],}))}})}//注册与删除事件addEventListener = (name, callback) => {this.listener.push({ name, callback })}removeListener = (name_, callback_) => {// 寻找对应事件绑定，=== 确定callback_for (let i = 0; i < this.listener.length; i++) {let { name, callback } = this.listener[i]if (name === name_ && callback === callback_) {this.listener.splice(i, 1)}}}
}

代码内使用

在初始化threejs场景的 class内使用

 		this.eventManage = new EventManage($dom, this.camera, this.scene)this.eventManage.addEventListener('click', (info) => console.log(info))this.metrologyUnit = new MetrologyUnit(this)//测试用其他组件

测试组件

export default class MetrologyUnit {constructor({ eventManage }) {let handler = (info) => {console.log("in Metro", info)}eventManage.addEventListener('click',handler)setTimeout(() => {eventManage.removeListener('click',handler)}, 3000)}
}

效果展示

页面中点击触发

{object: undefined}
index.js:7 in Metro 
{object: undefined}
index.js:45 
{object: {…}}
index.js:7 in Metro 
{object: {…}}
index.js:45 
{object: {…}}
index.js:7 in Metro 
{object: {…}}
index.js:45 //三秒后  （3000ms）{object: {…}}
index.js:45 
{object: {…}}
index.js:45 
{object: {…}}
index.js:45 
{object: undefined}


这篇关于【threejsJavascript】实现事件注册派送的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---