SpriteKit中的联系物理差距(Swift)
SpriteKit中的联系物理差距(Swift)
提问于 2015-07-15 23:28:04
我正在做我的第一个swift iOS精灵工具包项目，但我遇到了一个问题，我就是找不到解决方案。我的目标是让一个球落在一个移动的平台上，球和平台在接触时都会停止。
我遇到的问题是，当代码识别到平台和球正在接触并使它们停止时，平台和球之间始终存在差距。请看附件中的照片：
球：
//Ball Node
func createPlayer() -> SKNode {
let playerNode = SKNode()
playerNode.position = CGPoint(x: self.size.width / 2, y: self.size.height * 0.25)
let sprite = SKSpriteNode(imageNamed: "ball")
sprite.setScale(scaleFactor)
playerNode.addChild(sprite)
playerNode.physicsBody = SKPhysicsBody(circleOfRadius: sprite.size.width / 2)
playerNode.physicsBody?.dynamic = false
playerNode.physicsBody?.allowsRotation = false
playerNode.physicsBody?.restitution = 0.0
playerNode.physicsBody?.friction = 0.0
playerNode.physicsBody?.angularDamping = 0.0
playerNode.physicsBody?.linearDamping = 0.0
playerNode.physicsBody?.usesPreciseCollisionDetection = true
playerNode.physicsBody?.categoryBitMask = CollisionCategoryBitmask.Player
playerNode.physicsBody?.collisionBitMask = 0
playerNode.physicsBody?.contactTestBitMask = CollisionCategoryBitmask.Platform | CollisionCategoryBitmask.Vortex
return playerNode平台：
//Platform
sprite = SKSpriteNode(imageNamed: "platform")
let node = PlatformNode()
let thePosition = CGPoint(x: position.x * scaleFactor - (sprite.size.width / 1.999), y: position.y + (self.size.height * 0.50))
sprite.setScale(scaleFactor)
node.addChild(sprite)
node.physicsBody?.usesPreciseCollisionDetection = true
node.physicsBody = SKPhysicsBody(rectangleOfSize: sprite.size)
node.physicsBody?.dynamic = false
node.physicsBody?.categoryBitMask = CollisionCategoryBitmask.Platform
node.physicsBody?.collisionBitMask = 0
return nodedidBeginContact：
func didBeginContact(contact: SKPhysicsContact) {
var updateHUD = true
maxPlayerY = Int(player.position.y)
let whichNode = (contact.bodyA.node != player) ? contact.bodyA.node : contact.bodyB.node
//If the ball is falling
if player.physicsBody?.velocity.dy < 0 {
let other = whichNode as! GameObjectNode
//If the player hits the Platform
if player.physicsBody?.velocity.dy < 0 && whichNode?.name == "NODE_PLATFORM" {
let joint = SKPhysicsJointFixed.jointWithBodyA(player.physicsBody, bodyB:whichNode!.physicsBody, anchor:CGPoint(x: player.position.x, y: ballBottom))
let moveScreen = SKAction.moveToY(-(player.position.y - 200), duration: 0.5)
let moveVortex = SKAction.moveToY((player.position.y - scaleFactor*300), duration: 0.5)
physicsWorld.addJoint(joint
player.physicsBody?.velocity = CGVector(dx: player.physicsBody!.velocity.dx, dy: 0)
player.physicsBody?.affectedByGravity = false
}
}
}回答 1
Stack Overflow用户
发布于 2015-07-16 00:47:08
我怀疑您可以通过等待物理模拟(针对当前帧)完成后再连接对象来解决此问题。一种方法是在didBeginContact中球与平台接触时设置标志，然后在didSimulatePhysics中使用关节将两个身体连接起来。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/31434676
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