ios - 在 Sprite Kit 中混合颜色

Question

我是 Sprite Kit 的新手，我想用它来实现一个简单的游戏。我想知道这在 Sprite Kit 中是否可行:

假设我画了两个圆圈，一个是红色，另一个是绿色。这两个圆圈之间有一个重叠区域，我希望这个区域的颜色可以自动设置为RED + Green = Yellow，有点像下图。

是否可以使用 Sprite Kit 来实现？如果可以，如何设置？

非常感谢任何回复!

Answer 1

你可以玩一个 blending mode连同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: