[SceneKit专题]16.Actions动作

说明

本系列文章是对<3D Apple Games by Tutorials>一书的学习记录和体会此书对应的代码地址

SceneKit系列文章目录

动作可以让你操作节点的位置,缩放,旋转和透明度.比如左滑,场景中的小猪向左转并跳一步.
基本分类有四种:Move(移动), Scale(缩放), Rotate(旋转)和Fade(透明渐变).还有两种特殊的动作:Sequence(序列,即顺序执行)和Group(组,即同时执行).
** 注意,关于物理形体physics body**
当需要物理引擎来控制节点的移动和旋转时,应设置为dynamic.如果不需要移动,但仍能参与物理模拟,应设置为static.如果你既想控制某些节点的移动和旋转,同时仍能参与物理模拟,应设置为kinematic.

Move actions移动动作

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• Move Action:在当前位置上移动一段

• MoveTo Action:移动到指定位置,与当前位置无关

  
  
  

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Scale actions缩放动作

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• Scale Action: 在当前缩放基础上缩放.

• ScaleTo Action:缩放到指定比例,与当前比例无关

  
  
  

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Rotate actions旋转动作

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• Rotate Action:在当前旋转基础上再旋转
• RotateTo Action:旋转到指定角度,与当前旋转无关
• RotateTo Action (Shortest):旋转到指定角度,走最短路径
• RotateBy Axis Angle Action:绕某个轴旋转

• RotateTo Axis Angle Action:绕某个轴旋转到指定角度

  
  
  

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Fade actions褪色动作

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• FadeOut Action:淡出,从当前透明度渐渐变完全透明
• FadeIn Action:淡入,从当前透明度渐渐显示出来,完全不透明

• FadeOpacityTo Action:改变不透明度到指定值

  
  
  

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Sequenced and grouped actions序列和组动作

序列和组都是一系列动作的组合,可以让动作更复杂

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• Actions:左侧的每一个都是一个动作,上跳,下落,右移,右转
• Sequence:蓝色区域内就是序列,上跳动作执行1秒完成后,执行下落动作,按顺序

• Group:红色区域就是组,将会并发同时执行

  
  
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Linear线性,Ease-In渐入,Ease-Out渐出,East-In-Out渐入渐出

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The action editor动作编辑器

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• Expand/Collapse Action Editor:展开/收缩动作编辑器
• Timeline:时间线
• Time Cursor:时间游标
• Time Zoom:时间缩放
• Drag&Drop Actions:拖放动作

动作创建

拖放一个旋转动作到节点,设置开始时间和持续时长,指定为绕z轴旋转

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右击选中Create Loop,创建循环

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选中∞无限循环,当它变蓝时就好了. 不要点X,那会取消

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拖动游标预览效果

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代码添加动作

// 1.时长
let duration = 0.2
// 2.上下移动动作
let bounceUpAction = SCNAction.moveByX(0, y: 1.0, z: 0, duration:
duration * 0.5)
let bounceDownAction = SCNAction.moveByX(0, y: -1.0, z: 0, duration:
duration * 0.5)
// 3.时间模式
bounceUpAction.timingMode = .EaseOut
bounceDownAction.timingMode = .EaseIn
// 4.动作序列
let bounceAction = SCNAction.sequence([bounceUpAction, bounceDownAction])
// 5.四周移动动作
let moveLeftAction = SCNAction.moveByX(-1.0, y: 0, z: 0, duration:
duration)
let moveRightAction = SCNAction.moveByX(1.0, y: 0, z: 0, duration:
duration)
let moveForwardAction = SCNAction.moveByX(0, y: 0, z: -1.0, duration:
duration)
let moveBackwardAction = SCNAction.moveByX(0, y: 0, z: 1.0, duration:
duration)
// 6.旋转动作
let turnLeftAction = SCNAction.rotateToX(0, y: convertToRadians(-90), z:0, duration: duration, shortestUnitArc: true)
let turnRightAction = SCNAction.rotateToX(0, y: convertToRadians(90), z:
0, duration: duration, shortestUnitArc: true)
let turnForwardAction = SCNAction.rotateToX(0, y: convertToRadians(180),
z: 0, duration: duration, shortestUnitArc: true)
let turnBackwardAction = SCNAction.rotateToX(0, y: convertToRadians(0),
z: 0, duration: duration, shortestUnitArc: true)
// 7.动作组
jumpLeftAction = SCNAction.group([turnLeftAction, bounceAction,
moveLeftAction])
jumpRightAction = SCNAction.group([turnRightAction, bounceAction,
moveRightAction])
jumpForwardAction = SCNAction.group([turnForwardAction, bounceAction,
moveForwardAction])
jumpBackwardAction = SCNAction.group([turnBackwardAction, bounceAction,
moveBackwardAction])