January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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198
｜
第
6
章
解决方案
创建一个名为
Textures.atlas
的文件夹，把所有的纹理图片放到其中。
然后，通过将文件夹拖到项目导航窗口的办法，将文件夹添加到项目中。
讨论
一个纹理图集也是一个纹理图片，它会由许多小的纹理图片构成。纹理图集的使用，
意味着我们将用单一的较大的图片取代多个小图片。纹理图集比起多个小图片要省
内存，最重要的一点是它渲染的效率更高。当真正绘制精灵时，所用到的图形实际
上仅仅是纹理图集中的一小块区域。
如果我们的游戏中包含许多不同的精灵，每种精灵又使用不同的图片，则每当
Sprite Kit
渲染到一种新的精灵时，都需要切换不同的图片。每次图片的切换都会
带来一小点性能上的损失，一旦切换次数过多，则这些性能损失就会叠加起来。但
是，如果所有的精灵都使用同一个图片，则
Sprite Kit
就完全不需要切换图片，从
而使渲染的速度变快。
当我们把图片放到一个名称后缀为
.
atlas
的文件夹中，并开启
Texture Atlas
Generation
选项，
Xcode
会自动用文件夹中的图片产生一个纹理图集。所有的图片
都会被自动裁剪成透明背景图片以减少像素的浪费，并且所有的图片都会以尽可能
紧凑的方式拼接在一起。
当我们使用了纹理图集后，
Sprite Kit
代码仍然无需改变。下列代码无论是否使用
纹理图集都能正常运行：
let imageSprite = SKSpriteNode(imageNamed: "Spaceship")
6.12
形状节点
问题
我们想使用形状节点来绘制矢量图形。
2D
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.