使用SpriteKit绘制网格

Question

使用SpriteKit 2D游戏引擎绘制这样的网格最好的方法是什么？要求:

• 以编程方式输入列数和行数(5x5,10x3,3x4等).
• 绘制编程方式使用像SKSpriteNode或者SKShapeNode,因为只使用一个图像像这个广场似乎并不非常有效的给我.
• 正方形应该有一个固定的大小(假设每个都是40x40).
• 网格应在视图中垂直和水平居中.

我计划使用SKSpriteNode(从图像中)作为在此网格中移动不同方块的玩家.
因此,我将在二维数组中保存每个方块的中心点(x,y),然后从玩家的当前位置移动到该位置.如果您对此也有更好的建议,我想听听.

我很欣赏Swift中的解决方案(最好是2.1),但Objective-C也会这样做.计划仅在iPhone设备上使用它.
我的问题接近这一点.任何帮助表示赞赏.

Answer 1

我建议你将网格实现为一个纹理,SKSpriteNode因为Sprite Kit将在一次绘制调用中呈现网格.以下是如何执行此操作的示例:

class Grid:SKSpriteNode {
    var rows:Int!
    var cols:Int!
    var blockSize:CGFloat!

    convenience init?(blockSize:CGFloat,rows:Int,cols:Int) {
        guard let texture = Grid.gridTexture(blockSize: blockSize,rows: rows, cols:cols) else {
            return nil
        }
        self.init(texture: texture, color:SKColor.clear, size: texture.size())
        self.blockSize = blockSize
        self.rows = rows
        self.cols = cols
    }

    class func gridTexture(blockSize:CGFloat,rows:Int,cols:Int) -> SKTexture? {
        // Add 1 to the height and width to ensure the borders are within the sprite
        let size = CGSize(width: CGFloat(cols)*blockSize+1.0, height: CGFloat(rows)*blockSize+1.0)
        UIGraphicsBeginImageContext(size)

        guard let context = UIGraphicsGetCurrentContext() else {
            return nil
        }
        let bezierPath = UIBezierPath()
        let offset:CGFloat = 0.5
        // Draw vertical lines
        for i in 0...cols {
            let x = CGFloat(i)*blockSize + offset
            bezierPath.move(to: CGPoint(x: x, y: 0))
            bezierPath.addLine(to: CGPoint(x: x, y: size.height))
        }
        // Draw horizontal lines
        for i in 0...rows {
            let y = CGFloat(i)*blockSize + offset
            bezierPath.move(to: CGPoint(x: 0, y: y))
            bezierPath.addLine(to: CGPoint(x: size.width, y: y))
        }
        SKColor.white.setStroke()
        bezierPath.lineWidth = 1.0
        bezierPath.stroke()
        context.addPath(bezierPath.cgPath)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return SKTexture(image: image!)
    }

    func gridPosition(row:Int, col:Int) -> CGPoint {
        let offset = blockSize / 2.0 + 0.5
        let x = CGFloat(col) * blockSize - (blockSize * CGFloat(cols)) / 2.0 + offset
        let y = CGFloat(rows - row - 1) * blockSize - (blockSize * CGFloat(rows)) / 2.0 + offset
        return CGPoint(x:x, y:y)
    }
}

这里是如何创建一个网格并将一个游戏块添加到网格中

class GameScene: SKScene {
    override func didMove(to: SKView) {
        if let grid = Grid(blockSize: 40.0, rows:5, cols:5) {
            grid.position = CGPoint (x:frame.midX, y:frame.midY)
            addChild(grid)

            let gamePiece = SKSpriteNode(imageNamed: "Spaceship")
            gamePiece.setScale(0.0625)
            gamePiece.position = grid.gridPosition(row: 1, col: 0)
            grid.addChild(gamePiece)
        }
    }
}

更新:

要确定触摸了哪个网格方块,请将其添加到 init

self.isUserInteractionEnabled = true

这对于Grid班级:

override func touchesBegan(_ touches: Set<UITouch>, withEvent event: UIEvent?) {
    for touch in touches {
        let position = touch.location(in:self)
        let node = atPoint(position)
        if node != self {
            let action = SKAction.rotate(by:CGFloat.pi*2, duration: 1)
            node.run(action)
        }
        else {
            let x = size.width / 2 + position.x
            let y = size.height / 2 - position.y
            let row = Int(floor(x / blockSize))
            let col = Int(floor(y / blockSize))
            print("\(row) \(col)")
        }
    }
}