Follow a path inverse

Question

I\'m making a sprite to orbit a point and for that I made a path that is followed by that sprite:

    let dx1 = base1!.position.x - self.frame.width/2
    let dy         


        

Answer 1

A straightforward way to rotate a sprite about a point (i.e., orbit) is to create a container node, add a sprite to the node at an offset (relative to the container's center), and rotate the container node. Here's an example of how to do that:

class GameScene: SKScene {
    let sprite = SKSpriteNode(imageNamed:"Spaceship")
    let node = SKNode()

    override func didMove(to view: SKView) {
        sprite.xScale = 0.125
        sprite.yScale = 0.125
        sprite.position = CGPoint (x:100, y:0)

        node.addChild(sprite)
        addChild(node)

        let action = SKAction.rotate(byAngle:CGFloat.pi, duration:5)

        node.run(SKAction.repeatForever(action), withKey:"orbit")
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let action = node.action(forKey: "orbit") {
            // Reverse the rotation direction
            node.removeAction(forKey:"orbit")
            node.run(SKAction.repeatForever(action.reversed()),withKey:"orbit")
            // Flip the sprite vertically
            sprite.yScale = -sprite.yScale
        }
    }
}