swift – 在移动平台上移动节点

概述我有一个移动平台,但当节点在平台上方时,它不会随平台水平移动 在本文中,解释了问题：移动平台地狱 http://www.learn-cocos2d.com/2013/08/physics-engine-platformer-terrible-idea/ 在评论中有Box2D的解决方案：运动体 但是SpriteKit怎么样？ 更新 我正在使用平台 let moveHPart1 = SKAction. 我有一个移动平台,但当节点在平台上方时,它不会随平台水平移动

在本文中,解释了问题：移动平台地狱

http://www.learn-cocos2d.com/2013/08/physics-engine-platformer-terrible-idea/

在评论中有Box2D的解决方案：运动体

但是SpriteKit怎么样？

更新

我正在使用平台

let moveHPart1 = SKAction.moveByX(origW,y: 0,duration: moveDuration);let moveHPart2 = SKAction.moveByX(-origW,duration: moveDuration);platform(SKAction.repeatActionForever(SKAction.sequence([moveHPart1,moveHPart2])));

解决方法 我个人反对使用物理学来移动平台,因为移动平台物理主体必须是动态的.

静态平台

对于静态平台,将物理体动态属性设置为false是完美的解决方案.这就是它的意义.静态物体不受力的影响,但仍然会给你一个碰撞响应.所以,问题就解决了.

但是你无法通过使用力来改变静态物理体的位置.您可以使用 *** 作或手动设置其位置来执行此 *** 作.但是,那么你正在从物理模拟中移除一个平台.

为了完成所有物理学,你必须保持平台的动态.但这可能导致其他问题.例如,当玩家登陆平台时,他会将平台向下推,因为玩家有一个质量.
即使平台质量很大,它也会随着时间的流逝而下降.请记住,我们不能手动更新平台x位置,因为这可能会使物理模拟变得混乱.

“移动平台地狱”中所说的那个很好的article的LearnCocos2d可能是使用物理学完成这项任务时可能发生的最佳描述:-)

移动平台示例

为了向您展示一些可能性,我做了一个简单的例子,说明如何通过对其施加力来移动平台,并使角色留在它上面.为了使其工作,我做了很少的事情：

>改变了大量的平台.当玩家从下面碰到平台时,这将阻止平台移动.
>制作一个基于边缘的物理机构,以防止玩家落地时平台掉落.
>使用诸如允许旋转和摩擦等属性来获得所需效果.

这是代码：

import SpriteKitclass GameScene: SKScene,SKPhysicsContactDelegate{    let Bodycategory   : UInt32 = 0x1 << 1    let Platformcategory    : UInt32 = 0x1 << 2    let Wallcategory        : UInt32 = 0x1 << 3    let Edgecategory        : UInt32 = 0x1 << 4 // This will prevent a platforom from falling down    let Playercategory       : UInt32 = 0x1 << 5    let platformSpeed: CGfloat = 40.0    let body = SKShapeNode(circleOfRadius: 20.0)    let player = SKShapeNode(circleOfRadius: 20.0)    let platform = SKSpriteNode(color: SKcolor.greencolor(),size: CGSize(wIDth:100,height:20))    let notDynamicPlatform =  SKSpriteNode(color: SKcolor.greencolor(),height:20))    overrIDe func dIDMovetoVIEw(vIEw: SKVIEw)    {        //Setup contact delegate so we can use dIDBeginContact and dIDEndContact methods        physicsWorld.contactDelegate = self        //Setup borders        self.physicsBody = SKPhysicsBody(edgeLoopFromrect: self.frame)        self.physicsBody?.categoryBitMask = Wallcategory        self.physicsBody?.collisionBitMask = Bodycategory | Playercategory        //Setup some physics body object        body.position = CGPoint(x: CGRectGetMIDX(self.frame),y: CGRectGetMIDY(self.frame))        body.fillcolor = SKcolor.greencolor()        body.physicsBody = SKPhysicsBody(circleOfRadius: 20)        body.physicsBody?.categoryBitMask = Bodycategory        body.physicsBody?.contactTestBitMask = Platformcategory        body.physicsBody?.collisionBitMask = Platformcategory | Wallcategory        body.physicsBody?.allowsRotation = false        body.physicsBody?.dynamic = true        self.addChild(body)        //Setup player        player.position = CGPoint(x: CGRectGetMIDX(self.frame),y:30)        player.fillcolor = SKcolor.greencolor()        player.physicsBody = SKPhysicsBody(circleOfRadius: 20)        player.physicsBody?.categoryBitMask = Playercategory        player.physicsBody?.contactTestBitMask = Platformcategory        player.physicsBody?.collisionBitMask = Platformcategory | Wallcategory | Bodycategory        player.physicsBody?.allowsRotation = false        player.physicsBody?.friction = 1        player.physicsBody?.dynamic = true        self.addChild(player)        //Setup platform        platform.position = CGPoint(x: CGRectGetMIDX(self.frame),y: CGRectGetMIDY(self.frame) - 100)        platform.physicsBody = SKPhysicsBody(rectangleOfSize: platform.size)        platform.physicsBody?.categoryBitMask = Platformcategory        platform.physicsBody?.contactTestBitMask = Bodycategory        platform.physicsBody?.collisionBitMask = Bodycategory | Edgecategory | Playercategory        platform.physicsBody?.allowsRotation = false        platform.physicsBody?.affectedByG@R_502_6610@ty = false        platform.physicsBody?.dynamic = true        platform.physicsBody?.friction = 1.0        platform.physicsBody?.restitution = 0.0        platform.physicsBody?.mass = 20        //Setup edge        let edge = SKNode()        edge.physicsBody = SKPhysicsBody(edgeFromPoint: CGPoint(x: 0,y:-platform.size.height/2),topoint: CGPoint(x: self.frame.size.wIDth,y:-platform.size.height/2))        edge.position = CGPoint(x:0,y: CGRectGetMIDY(self.frame) - 100)        edge.physicsBody?.categoryBitMask = Edgecategory        edge.physicsBody?.collisionBitMask = Platformcategory        self.addChild(edge)        self.addChild(platform)    }    overrIDe func update(currentTime: NSTimeInterval) {        if(platform.position.x <= platform.size.wIDth/2.0 + 20.0 && platform.physicsBody?.veLocity.dx < 0.0 ){            platform.physicsBody?.veLocity = CGVectorMake(platformSpeed,0.0)        }else if((platform.position.x >= self.frame.size.wIDth - platform.size.wIDth/2.0 - 20.0) && platform.physicsBody?.veLocity.dx >= 0.0){            platform.physicsBody?.veLocity = CGVectorMake(-platformSpeed,0.0)        }else if(platform.physicsBody?.veLocity.dx > 0.0){             platform.physicsBody?.veLocity = CGVectorMake(platformSpeed,0.0)        }else{            platform.physicsBody?.veLocity = CGVectorMake(-platformSpeed,0.0)        }    }    overrIDe func touchesBegan(touches: NSSet,withEvent event: UIEvent) {        let touch: AnyObject? = touches.anyObject()        let location = touch?.locationInNode(self)        if(location?.x > 187.5){            player.physicsBody?.applyImpulse(CGVector(dx: 3,dy: 50))        }else{            player.physicsBody?.applyImpulse(CGVector(dx: -3,dy: 50))        }    }}

结果如下：

总结

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