SpriteKit中具有深度的背景动画 [英] Background animation with depth in SpriteKit
问题描述
我正在使用Swift和SpriteKit构建我的第一个游戏,并且想要添加背景.游戏是在太空中进行的,所以我想让背景中的星星以不同的速度运动.目前,我要通过使较大的恒星比较小的恒星在屏幕上移动更快来实现3D外观.有没有一种有效的方法来执行此操作,而不是像这样创建SKNode子类并将其作为子级添加到DidMoveToView
的开头?看来这种方法很费力,但我想我会尝试一遍又一遍地回收相同的图像.
I'm building my first game using Swift and SpriteKit and want to add a background. The game takes place in space so I wanted to have stars in the background moving at varying speeds. Currently, I'm going for a 3D look by making the larger stars move across screen faster than the smaller ones. Is there an efficient way to do this rather than making a SKNode subclass like this and adding it as a child at the start of DidMoveToView
? It seems like this method is pretty intensive but I thought I'd try it before recycling the same image over and over.
class BackGroundAnimation:SKNode{
let theView:SKView
init(aView:SKView){
theView = aView
super.init()
animate()
}
func animate(){
for _ in 1...200{
let randomSize = random(1, max: 3)
var randomPosx = random(1,max: 1000)
randomPosx = randomPosx/1000.0
var randomPosy = random(1,max: 1000)
randomPosy = randomPosy/1000.0
let star:SKSpriteNode = SKSpriteNode(texture:starTexture)
star.setScale(randomSize/60.0)
star.position = CGPoint(x:(theView.scene?.size.width)! * randomPosx,y:(theView.scene?.size.width)! * randomPosy)// (self.scene.size.width)*randomPosx, y:(self.scene.size.height) * randomPosy)
//star.position = CGPoint(x: 200,y: 200)
star.physicsBody = SKPhysicsBody(circleOfRadius: star.size.width/2 )
star.physicsBody?.collisionBitMask = 0
star.physicsBody?.categoryBitMask = 0
star.physicsBody?.contactTestBitMask = 0
star.physicsBody?.linearDamping = 0
star.physicsBody?.velocity = CGVector(dx:1 * randomSize, dy:0)
star.name = "star"
//addChild(star)
self.addChild(star)
self.moveToParent(self.scene!)
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
任何帮助都会很棒.
推荐答案
正如我在评论中提到的那样,您可以使用粒子创建漂亮的视差背景.
As I mentioned in a comment, you can create a beautiful parallax background using particles.
将此功能添加到班级中的任何地方.
Add this function anywhere in your class.
//Creates a new star field
func starfieldEmitterNode(speed speed: CGFloat, lifetime: CGFloat, scale: CGFloat, birthRate: CGFloat, color: SKColor) -> SKEmitterNode {
let star = SKLabelNode(fontNamed: "Helvetica")
star.fontSize = 80.0
star.text = "✦"
let textureView = SKView()
let texture = textureView.textureFromNode(star)
texture!.filteringMode = .Nearest
let emitterNode = SKEmitterNode()
emitterNode.particleTexture = texture
emitterNode.particleBirthRate = birthRate
emitterNode.particleColor = color
emitterNode.particleLifetime = lifetime
emitterNode.particleSpeed = speed
emitterNode.particleScale = scale
emitterNode.particleColorBlendFactor = 1
emitterNode.position = CGPoint(x: CGRectGetMidX(frame), y: CGRectGetMaxY(frame))
emitterNode.particlePositionRange = CGVector(dx: CGRectGetMaxX(frame), dy: 0)
emitterNode.particleSpeedRange = 16.0
//Rotates the stars
emitterNode.particleAction = SKAction.repeatActionForever(SKAction.sequence([
SKAction.rotateByAngle(CGFloat(-M_PI_4), duration: 1),
SKAction.rotateByAngle(CGFloat(M_PI_4), duration: 1)]))
//Causes the stars to twinkle
let twinkles = 20
let colorSequence = SKKeyframeSequence(capacity: twinkles*2)
let twinkleTime = 1.0 / CGFloat(twinkles)
for i in 0..<twinkles {
colorSequence.addKeyframeValue(SKColor.whiteColor(),time: CGFloat(i) * 2 * twinkleTime / 2)
colorSequence.addKeyframeValue(SKColor.yellowColor(), time: (CGFloat(i) * 2 + 1) * twinkleTime / 2)
}
emitterNode.particleColorSequence = colorSequence
emitterNode.advanceSimulationTime(NSTimeInterval(lifetime))
return emitterNode
}
然后再添加此功能.这是将创建星星层的功能.只需调用此函数,例如在didMoveToView中即可.
And then add this function too. This is the function that will create the layers of stars. Just call this function, such as in the didMoveToView.
func createStarLayers() {
//A layer of a star field
let starfieldNode = SKNode()
starfieldNode.name = "starfieldNode"
starfieldNode.addChild(starfieldEmitterNode(speed: -48, lifetime: size.height / 23, scale: 0.2, birthRate: 1, color: SKColor.lightGrayColor()))
addChild(starfieldNode)
//A second layer of stars
var emitterNode = starfieldEmitterNode(speed: -32, lifetime: size.height / 10, scale: 0.14, birthRate: 2, color: SKColor.grayColor())
emitterNode.zPosition = -10
starfieldNode.addChild(emitterNode)
//A third layer
emitterNode = starfieldEmitterNode(speed: -20, lifetime: size.height / 5, scale: 0.1, birthRate: 5, color: SKColor.darkGrayColor())
starfieldNode.addChild(emitterNode)
}
这就是它的样子.
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