Cocos2d添加背景图像到图层？ [英] Cocos2d adding a background image to a layer?

问题描述

我刚刚阅读了一些cocos2d文档，根据我的理解，添加一个背景图片到一个图层你必须做一些事情：

I just finished reading some of the cocos2d documentation, and as far as I understand to add a background image to a layer you have to do something like:

Sprite * bg = [Sprite spriteWithFile:@"Background.png"];
[layer addChild:bg z:0];

尽管对我的测试，你可以直接将sprite添加到场景中， / p>

Allthough as far as my testing goes you can just directly add the sprite to the scene like this:

@implementation IntroScene
- (id) init {
self = [super init];
if (self != nil) {
    Sprite * bg = [Sprite spriteWithFile:@"Background.png"];
    [bg setPosition:ccp(240, 160)];
    [self addChild:bg z:0];
    [self addChild:[MenuLayer node] z:1];
}
return self;

}

这2个选项，什么是更好的方式来设置图层的背景？任何帮助将非常感激。

What is the difference between this 2 options, and what is the better way to set a background for a layer?. Any help will be greatly appreciated.

推荐答案

你不需要有一个图层，但他们很方便。将层视为将sprite（视觉和组织）分组的一种方式。你可能希望你的背景图片分组为一个层，所有的敌人在游戏中作为另一个层。这允许你更干净地处理每个集。例如您可以移除特定图层，而不是找到所有敌人并删除它们。

You do not need to have a layer, but they are handy. Think of the layers as a way of grouping sprites (both visually and organizationally). You may want your background images grouped as a layer and all the enemies in a game as another layer. This allows you to deal with each set more cleanly. e.g. You can remove a specific layer instead of finding all of the enemies and removing them.

如果有帮助，请在Photoshop或图形编辑程序中播放图层。 cocos2d中的图层类似。

If it helps, play with layers in Photoshop or a graphics editing program. Layers in cocos2d work similarly.

对于一个简单的场景，将背景添加到图层或场景不会有什么区别。但它不需要很久以前的分层的好处。

For a simple scene, adding the background to a layer or to a scene won't make much difference. But it doesn't take long before the benefits of layering kicks in.

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