初始化
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---
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title: egret 练手 《围住神经猫》
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tags: []
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id: '115'
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categories:
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- - 分享
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date: 2017-09-04 11:42:10
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---
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Egret引擎是一个开源免费的游戏框架，用于构建二维游戏、演示程序和其他图形界面交互应用等。Egret使用TypeScript脚本语言开发。当游戏完成最终的打包后，可以将程序转换为HTML5游戏。实现跨平台特性。 Egret不仅仅是一个基于HTML5技术的游戏引擎，我们的产品线中除了Egret引擎还提供了很多辅助游戏开发的工具。准确的来说，Egret是一套游戏开发的解决方案。你可以使用Egret引擎来帮助你开发HTML5游戏，并运行在手机和PC端的浏览器中，同时也你可以使用Egret提供的相关工具搭建你自己的游戏开发工作流。 Egret的语法与ActionScript 3.0 一致，如果对as3.0熟悉的童鞋能很快上手。 果然有兴趣的童鞋可以直接去Egret的官网，有详细的文档资料 [白鹭引擎官网](https://www.egret.com/) 最近学习Egret，看了一些文档后，决定找个简单的项目自己练一下手，《围住神经猫》应该是个很好的选择。 先贴上完成的作品 [Demo](https://demo.dengtongyu.com/pages/nervcat/) **1.新建项目** 打开EgretWing --> 文件 --> 新建项目 --> Egret游戏项目 完成后打开 src 下的 Main.ts，改文件就是整个项目的入口文件，里面还有一些已经写好的方法，方便你后面调用。 具体请参考 [传送门](http://edn.egret.com/cn/article/index/id/579) 里面介绍得很详细 **2.加载进度条** 新建游戏项目后，默认的加载进度比较简陋，我们需要美化一下。 打开 src\\LoadingUI.ts 文件，这个就是加载进度条的类。
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```
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class LoadingUI extends egret.Sprite {
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public constructor() {
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super();
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this.createView();
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}
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private textField:egret.TextField;
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private createView():void {
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this.textField = new egret.TextField();
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this.addChild(this.textField);
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this.textField.y = 300;
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this.textField.width = 480;
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this.textField.height = 100;
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this.textField.textAlign = "center";
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}
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public setProgress(current:number, total:number):void {
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this.textField.text = `Loading...${current}/${total}`;
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}
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}
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```
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从代码可以看出，进度条仅仅是用文字展示了加载进度，我们来加个进度条UI美化一下。
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```
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class LoadingUI extends egret.Sprite {
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public constructor() {
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super();
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this.createView();
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}
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private textField:egret.TextField;
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private pBarBg:egret.Shape;
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private pBarMove:egret.Shape;
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private createView():void {
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this.pBarBg = new egret.Shape();
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this.pBarBg.graphics.beginFill( 0x989898, 1);
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this.pBarBg.graphics.drawRect( 0, 0, this.width, this.height );
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this.pBarBg.graphics.endFill();
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this.addChild(this.pBarBg);
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this.pBarMove = new egret.Shape();
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this.addChild(this.pBarMove);
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this.textField = new egret.TextField();
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this.textField.width = this.width;
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this.textField.textAlign = "center";
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this.textField.y = 15;
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this.addChild(this.textField);
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}
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private moveProgressBar(percent:number):void{
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this.pBarMove.graphics.beginFill( 0x518cdd, 1);
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this.pBarMove.graphics.drawRect( 0, 0, this.width*percent, this.height);
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this.pBarMove.graphics.endFill();
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}
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public setProgress(current:number, total:number):void {
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var num = Math.floor(current / total * 100);
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this.textField.text = 'Loading... ' + num.toString() + " %";
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this.moveProgressBar(current/total);
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}
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}
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```
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效果如图：  **3.开始画面** 进度条弄好之后，我们开始做游戏开始的画面。如图：  可以看出，开始画面由背景、网格地图和开始按钮的图片组成，这个实现起来很简单。
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```
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private mapGroup:eui.Group;//地图容器
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private circleArray:Array<object>;//圆圈网格的数组
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private bg:egret.Bitmap;//开始Bitmap
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private popGroup:eui.Group;//开始画面容器
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private btnStart:eui.Button;//开始按钮
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private btnStartPng:egret.Bitmap;//开始Bitmap
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private init():void{
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//利用白鹭预设的创建bitmap方法创建背景图片
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this.bg = this.createBitmapByName("bg_jpg");
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this.stage.addChild(this.bg);
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//地图容器
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this.mapGroup = new eui.Group();
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this.mapGroup.width = 560;
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this.mapGroup.height = 560;
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this.mapGroup.x = 40;
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this.mapGroup.y = 400;
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this.stage.addChild(this.mapGroup);
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//开始画面容器
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this.popGroup = new eui.Group();
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this.popGroup.width = this.SW;
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this.popGroup.height = this.SH;
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this.popGroup.layout = new eui.BasicLayout();
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this.stage.addChild(this.popGroup);
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//开始Bitmap
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this.btnStartPng = this.createBitmapByName("btn_start_png");
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this.btnStartPng.scaleX = this.btnStartPng.scaleY = 1.2;
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//开始按钮
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this.btnStart = new eui.Button();
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this.btnStart.width = this.btnStartPng.width;
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this.btnStart.height = this.btnStartPng.height;
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this.btnStart.horizontalCenter = 0;
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this.btnStart.verticalCenter = 0;
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this.popGroup.addChild(this.btnStart);
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this.btnStart.addChild(this.btnStartPng);
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this.btnStart.addEventListener(egret.TouchEvent.TOUCH_TAP,this.touchHandler,this);
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}
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private touchHandler(event:TouchEvent) {
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this.popGroup.visible = this.btnStartPng.visible = false;
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this.btnStart.removeEventListener(egret.TouchEvent.TOUCH_TAP,this.touchHandler,this);
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}
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然后在createGameScene方法里面执行this.init()就可以了。
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但是我们还要绘制围住神经猫的9X9的网格地图。
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我们在 src 下面创建一个自定义布局类，命名为 Map.ts
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```
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```
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module uilayout {
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var UIComponentClass = "eui.UIComponent";
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/**自定义的布局类*/
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export class CatMap extends eui.LayoutBase{
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public constructor(){
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super();
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}
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/**
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* 计算target的尺寸
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* 如果您的自定义布局需要根据内部子项计算尺寸，请重写这个方法
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**/
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public measure():void{
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super.measure();
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}
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/**
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* 重写显示列表更新
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*/
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public updateDisplayList(unscaledWidth:number, unscaledHeight:number):void{
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super.updateDisplayList(unscaledWidth, unscaledHeight);
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if (this.target==null)
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return;
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let sunElement:eui.UIComponent;
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//子元素个数
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let count:number = this.target.numElements;
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//元素x轴方向间隔
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let gapX:number = 0;
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//元素y轴方向间隔
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let gapY:number = 0;
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//元素所在列数
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let column:number = 0;
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//元素所在行数
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let row:number = 0;
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//奇偶行数错位距离
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let parityWidth:number = 0;
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if(count > 0) {
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sunElement = <eui.uicomponent> this.target.getElementAt(0);
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gapX = (unscaledWidth - sunElement.width * 9 - sunElement.width / 2)/8;
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gapY = (unscaledHeight - sunElement.height * 9 - sunElement.height / 2)/8;
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//console.log(unscaledWidth,unscaledHeight,sunElement.width,sunElement.height);
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}
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for (let i:number = 0; i < count; i++){
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let layoutElement:eui.UIComponent = <eui.uicomponent> ( this.target.getElementAt(i) );
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if ( !egret.is(layoutElement,UIComponentClass) !layoutElement.includeInLayout ) {
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continue;
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}
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row = Math.floor(i / 9);
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column = i % 9;
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if(row % 2 == 0) {
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parityWidth = 0;
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}else{
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parityWidth = layoutElement.width / 2;
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}
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let childX:number = column * (layoutElement.width + gapX) + parityWidth;
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let childY:number = row * (layoutElement.height + gapY);
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layoutElement.setLayoutBoundsPosition(childX, childY);
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}
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}
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}
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}
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```
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这样一个自定义布局类就写好了，如果对自定义布局不太了解的，可以去Egret的官网查看文档 [传送门](http://edn.egret.com/cn/article/index/id/525) 然后，我们在Main.ts入口文件里绘制9X9的圆圈网格。
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```
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/**创建网格**/
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private creatMap() {
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this.circleArray = new Array();
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for(let i = 0;i<81;i++){ let circleData = new Object(); circleData['ui'] = new eui.Group(); circleData['ui'].name = i; circleData['img1'] = this.createBitmapByName('pot1_png'); circleData['img2'] = this.createBitmapByName('pot2_png'); if(i == 40) { circleData['img1'].visible = true; circleData['img2'].visible = false; circleData['val'] = 0; }else{ if(Math.random()*10 > 8) {
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circleData['img1'].visible = false;
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circleData['img2'].visible = true;
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circleData['val'] = 1;
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}else{
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circleData['img1'].visible = true;
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circleData['img2'].visible = false;
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circleData['val'] = 0;
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}
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}
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this.circleArray.push(circleData);
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circleData['img1'].scaleX = circleData['img1'].scaleY = 1.2;
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circleData['img2'].scaleX = circleData['img2'].scaleY = 1.2;
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circleData['ui'].width = circleData['img1'].width;
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circleData['ui'].height = circleData['img1'].height;
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//circleData['ui'].layout = new eui.BasicLayout();
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circleData['ui'].addChild(circleData['img1']);
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circleData['ui'].addChild(circleData['img2']);
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if(i == 40) {//中间神经猫的位置
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this.insertRunCat(circleData['ui']);
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this.cat.visible = false;
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this.catPos = 40;
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}
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if(circleData['val'] == 0) {
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circleData['img1'].touchEnabled = true;
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circleData['img1'].addEventListener(egret.TouchEvent.TOUCH_TAP,this.touchCircle,this);
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}
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this.mapGroup.addChild(circleData['ui']);
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}
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//引用自定义布局
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this.mapGroup.layout = new uilayout.CatMap();
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}
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```
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然后在init方法里面执行this.creatMap()就可以完成绘制了  后面的操作逻辑就不赘述了，有机会再跟大家分享。
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