SpriteKit部分纹理映射

试着这样做:

import SpriteKit
import GameplayKit

class GameScene: SKScene {

   let visibleArea = SKSpriteNode(color: .black, size: CGSize(width:100,height:100))

   let parentNode = SKSpriteNode(color: .white, size: CGSize(width:200, height:200))

    override func didMove(to view: SKView) {

        let cropNode = SKCropNode()

        let texture = SKSpriteNode(imageNamed: "Spaceship")

        visibleArea.position = CGPoint(x: 0, y: 100)
        cropNode.maskNode = visibleArea

        cropNode.addChild(texture)

        addChild(cropNode)


    }


    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {

            let location = touch.location(in: self)

            let previousPosition = touch.previousLocation(in: self)

                let translation = CGPoint(x: location.x - previousPosition.x , y: location.y - previousPosition.y )

                visibleArea.position = CGPoint(x: visibleArea.position.x + translation.x , y: visibleArea.position.y + translation.y)
        }
    }
}

重写的touchemoved方法只是因为有更好的示例。我在这里做的是:

• 创建SKCropNode
• 向其添加纹理,该纹理将被遮罩
• 定义了可见区域,即SKSpriteNode,并将其分配给裁剪节点的掩码属性,该属性实际上起到了神奇的作用

结果如下:

如果要将纹理分解为小块纹理,用作拼图块,则需要使用 SKTexture(rect: in texture:)

下面是一个如何使用它的示例:

let texture = SKTexture(...)  //How ever you plan on getting main texture
let subTextureRect = CGRect(x:0,y:0.width:10,height:10) // The actual location and size of where you want to grab the sub texture from main texture
let subTexture = SKTexture(rect:subTextureRect, in:texture);

现在,您有一块子纹理可用于其他节点。