制作运动范围SKSpriteNode

Make Range of Movement SKSpriteNode

所以这是我的代码:

import SpriteKit
import GameplayKit

class GameScene: SKScene {

    var ship1 = [2,1]
    var ship2 = [1,2]

    let jonahSpriteNode = SKSpriteNode(imageNamed: "jonah_spaceship")
    let georgeSpriteNode = SKSpriteNode(imageNamed: "george_spaceship")

    override func didMove(to view: SKView) {
        //var jonahFrames = [SKTexture]()
        jonahSpriteNode.position = CGPoint(x: 30, y: frame.midY)
        jonahSpriteNode.size = CGSize(width: 100.0, height: 100.0)
        addChild(jonahSpriteNode)

        georgeSpriteNode.position = CGPoint(x: 628, y: frame.midY)
        georgeSpriteNode.size = CGSize(width: 100.0, height: 100.0)
        addChild(georgeSpriteNode)
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches{
            var touchLocation = touch.location(in: self)
            var angle1 = atan2(jonahSpriteNode.position.y - touchLocation.y , jonahSpriteNode.position.x - touchLocation.x)
            var angle = angle1 - CGFloat(Double.pi / 1)

            let rotate = SKAction.rotate(toAngle: angle, duration: 1.0)
            let move = SKAction.move(to: CGPoint(x: touchLocation.x, y: touchLocation.y), duration: 2.5)
            let sequence = SKAction.sequence([rotate, move])
            jonahSpriteNode.run(sequence)
        }
    }
}

我开始了一个 space 射击游戏,我想设置一个移动范围,这样 SKSpriteNode 只能移动这么远。我想让范围成为一个圆形区域。有谁知道我可以做到这一点的方法吗?我搜索了 google 和堆栈溢出,但没有相关问题。你知道,我是 swift 的新手。这可能是一个非常简单的答案,但我找不到。如果有人有想法请回答。

您可以像这样向节点添加约束:

func makeCircularRange(to node: SKNode) {
    let range = SKRange(lowerLimit: 0, upperLimit: 100)
    let constraint = SKConstraint.distance(range, to: .zero)
    node.constraints = [constraint]
}

当然可以更改值和中心,.zero其他值仅供示例。

在这个例子中,绿点有限制,红点没有。

在此处查看完整示例:https://github.com/Maetschl/SpriteKitExamples/blob/master/CircularRange/CircularRange/GameScene.swift