Sprite Kit中的混色

Question

我是Sprite Kit的新手，我想用它來實現一個簡單的遊戲。我想知道這是否可能在雪碧套件：

假設我畫兩個圈，一個在紅，另一個在綠色。這兩個圓圈之間有重疊區域，我希望此區域的顏色可以自動設置爲RED + Green =黃色，有點像下圖。

使用Sprite Kit可以這樣做嗎？如果可能的話，如何設置它？

任何回覆非常感謝！

Answer 1

可以連同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) 

    } 
} 

結果：