egret.SpriteSheet 没有addTexture这个方法

非常抱歉，我的回答有误。您说得对，Egret中的SpriteSheet确实没有addTexture方法。正确的方法是使用 `createTexture()` 方法创建小图，然后使用 `sheet.textures` 属性将所有小图添加到 `SpriteSheet` 对象中。例如：

let texture: egret.Texture = RES.getRes("image_json.image_png");
let sheet: egret.SpriteSheet = new egret.SpriteSheet(texture);
let texture1: egret.Texture = sheet.createTexture("image_name1", x1, y1, width1, height1);
let texture2: egret.Texture = sheet.createTexture("image_name2", x2, y2, width2, height2);
sheet.textures["image_name1"] = texture1;
sheet.textures["image_name2"] = texture2;

这将创建名为 "image_name1" 和 "image_name2" 的两个纹理并将它们添加到 `SpriteSheet` 对象中。

相关问题

egret.setInterval

Egret.setInterval is a method in the Egret framework that allows you to execute a function repeatedly with a specified time interval. It is commonly used for creating animations or running tasks at regular intervals. The basic syntax for using Egret.setInterval is as follows:

egret.setInterval(callback: Function, thisObject: any, delay: number): number

- `callback`: The function to be executed at each interval.
- `thisObject`: The object to which the "this" keyword refers to inside the callback function (optional).
- `delay`: The time interval (in milliseconds) between each execution of the callback function.

The method returns a unique identifier (number) that can be used to clear the interval later using the `egret.clearInterval` method.

Here's an example usage of Egret.setInterval:

let intervalId = egret.setInterval(() => {
    console.log("Executing callback function");
}, this, 1000);

In this example, the callback function will be executed every 1000 milliseconds (1 second). The `this` keyword refers to the current object. The `intervalId` can be later used to clear the interval if needed using `egret.clearInterval(intervalId)`.

egret 如何实现动态合图

Egret 中可以使用 `egret.SpriteSheet` 类来实现动态合图。动态合图是将多张小图合成一张大图，可以减少图片加载次数和提高游戏性能。

具体实现步骤如下：

1. 创建一个 `egret.SpriteSheet` 对象。

2. 使用 `egret.SpriteSheet` 的 `createTexture()` 方法创建多个小图。

3. 将小图添加到 `egret.SpriteSheet` 对象中。

4. 使用 `egret.SpriteSheet` 的 `getTexture()` 方法获取合并后的大图中的小图纹理。

示例代码如下：

// 创建一个 SpriteSheet 对象
var spriteSheet: egret.SpriteSheet = new egret.SpriteSheet(RES.getRes("texture_png"));

// 创建小图
var texture1: egret.Texture = spriteSheet.createTexture("texture1", x1, y1, width1, height1);
var texture2: egret.Texture = spriteSheet.createTexture("texture2", x2, y2, width2, height2);

// 将小图添加到 SpriteSheet 对象中
spriteSheet.addTexture(texture1);
spriteSheet.addTexture(texture2);

// 获取合并后的大图中的小图纹理
var texture: egret.Texture = spriteSheet.getTexture("texture1");

注意，使用动态合图时需要注意小图之间的间隔和边界问题，以避免出现图像拼接错误的情况。