Sprite Kit中的混色

Question

我是Sprite Kit的新手，我想用它来实现一个简单的游戏。我想知道这是否可能在雪碧套件：

假设我画两个圈，一个在红，另一个在绿色。这两个圆圈之间有重叠区域，我希望此区域的颜色可以自动设置为RED + Green =黄色，有点像下图。

使用Sprite Kit可以这样做吗？如果可能的话，如何设置它？

任何回复非常感谢！

Answer 1

可以连同blending mode玩SKEffectNode：

class GameScene:SKScene{ 

    override func didMoveToView(view: SKView) { 


     let effect = SKEffectNode() 

     //Creating shapenodes 
     let shape1 = SKShapeNode(circleOfRadius: 50) 
     shape1.fillColor = SKColor.redColor() 
     shape1.strokeColor = SKColor.clearColor() 
     shape1.zPosition = 1 
     shape1.blendMode = SKBlendMode.Add 

     let shape2 = SKShapeNode(circleOfRadius: 50) 
     shape2.fillColor = SKColor.greenColor() 
     shape2.strokeColor = SKColor.clearColor() 
     shape2.zPosition = 2 
     shape2.blendMode = SKBlendMode.Add 

     let shape3 = SKShapeNode(circleOfRadius: 50) 
     shape3.fillColor = SKColor.blueColor() 
     shape3.strokeColor = SKColor.clearColor() 
     shape3.zPosition = 3 
     shape3.blendMode = SKBlendMode.Add 


     //Positioning 
     shape1.position = CGPoint(x: CGRectGetMidX(frame), y: CGRectGetMidY(frame)) 

     shape2.position = CGPoint(x: shape1.position.x - 25, y: shape1.position.y - 50) 

     shape3.position = CGPoint(x: shape1.position.x + 25, y: shape1.position.y - 50) 

     effect.addChild(shape1) 
     effect.addChild(shape2) 
     effect.addChild(shape3) 

     self.addChild(effect) 

    } 
} 

结果：