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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物理学
｜
219
碰撞体
碰撞体定义了物体的形状。常见的形状如正方形、矩形、圆形和多边形。在
Sprite Kit
中，所有物体都有碰撞体，它在我们创建物体时定义（在其他一些物
理引擎中，物体和碰撞体是不同的概念）。
边缘碰撞体
边缘碰撞体是一种碰撞体，它由一条或多条细线构成。边缘碰撞体在创建墙或
障碍物时非常有用，因为它们一般都非常简单且便于模拟。具有边缘碰撞体的
物体永远不会运动，它是静态物体。
碰撞
当两个物体发生接触时，我们称之为碰撞。注意，碰撞和碰撞体是不同的概念，
碰撞是一个会发生的事件，而碰撞体仅仅是一个形状。发生碰撞时，我们可以
从碰撞中获得这些信息，如发生碰撞的是哪些物体，它们碰撞的位置等。
连接
连接是两个物体之间的一种关系。存在有几种不同的连接。常见的是“
pin
”连
接，即一个物体能够旋转，但不能从另一个物体的某个相对点离开。另一种是
“
spring
”连接，一个物体能够离开另一个物体，但当它运动到距离另一个物
体的某个范围时，它又会被弹回第一个物体。
7.2
为精灵添加物理特性
问题
我们想让精灵受重力和其他物理力量的影响。
解决方案
要让一个
SKSpriteNode
具有物理特性，需要创建一个
SKPhysicsBody
对象，然后
赋给节点的
physicsBody
属性：
// scene
是一个
SKScene
对象
let sprite = SKSpriteNode(color:SKColor.white,
size:CGSize(width: 100, height: 50)) ...
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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.