swift - 在 Sprite Kit 动画中运行简笔画

Question

我在 SpriteKit 中玩了一点，并试图让一个火柴人跑起来。由于我缺乏经验，我相信我是以一种非常规的方式开始这个过程的。

我没有画出每个单独的运动帧，而是加载了简笔画的单独图像(即头部、膝盖、大腿、 body 、 ARM 等)并告诉它们相应地移动。到目前为止，除了在运行过程中膝盖的运动和旋转之外，一切都吻合在一起。

我的问题是:

当大腿在步幅中向后拉时，膝盖会分离，并在旋转时沿着一条直线到达步幅的末端。

我的问题是:

有没有办法将大腿节点连接到小腿节点，就好像它们在运动时连接在“膝盖”上一样？还是有更有效的方法？

这是我的代码片段，它可能比我之前的代码更具描述性。

   func thigh_run(){
        //running config
        //DONT CHANGE!
        var thigh_rotation = CGFloat(M_PI)*0.8
        //Can Change :)
        var run_speed = NSTimeInterval(0.25)

        // reset the action sequence... basically
        let pos_nuetralize = SKAction.rotateByAngle(thigh_rotation/2, duration: run_speed)
        let neg_nuetralize = SKAction.rotateByAngle(-thigh_rotation/2, duration: run_speed)            
        //strides
        let thigh_pull = SKAction.rotateByAngle(-thigh_rotation, duration: run_speed*2)
        let thigh_stride = SKAction.rotateByAngle(thigh_rotation/2, duration: run_speed)           
        // for the opposite leg
        let b_thigh_pull = SKAction.rotateByAngle(-thigh_rotation/2, duration: run_speed)
        let b_thigh_stride = SKAction.rotateByAngle(thigh_rotation, duration: run_speed*2)

        //knee movement       
        let stride = SKAction.sequence([thigh_stride, thigh_pull, pos_nuetralize])
        let pull = SKAction.sequence([b_thigh_pull, b_thigh_stride, neg_nuetralize])
        r_arm.runAction(SKAction.repeatActionForever(stride))
        f_leg_thigh.runAction(SKAction.repeatActionForever(stride))
        b_leg_thigh.runAction(SKAction.repeatActionForever(pull))
        //knee_run(run_speed)


    }

    func knee_run(speed: NSTimeInterval){

        let knee_stride = SKAction.moveTo(CGPointMake(f_leg_thigh.position.x+f_leg_thigh.size.height, f_leg_thigh.position.y), duration: speed)
        let knee_reset = SKAction.moveTo(CGPointMake(f_leg_thigh.position.x, f_leg_thigh.position.y-f_leg_thigh.size.height), duration: speed)
        let knee_pull_rotate = SKAction.rotateToAngle(CGFloat(M_PI)/2, duration: speed, shortestUnitArc: true)
        let knee_pull_rotate_half = SKAction.rotateToAngle(CGFloat(M_PI)*2, duration: speed, shortestUnitArc: true)
        let knee_pull_half = SKAction.moveTo(CGPointMake(f_leg_thigh.position.x-f_leg_thigh.size.height, f_leg_thigh.position.y/2), duration: speed)
        let knee_pull = SKAction.moveTo(CGPointMake(f_leg_thigh.position.x-f_leg_thigh.size.height, f_leg_thigh.position.y), duration: speed)




        //Grouping of the knee moving and rotating at the same time
        let knee_pull_group_half = SKAction.group([knee_pull_half, knee_pull_rotate_half])
        let knee_pull_group = SKAction.group([knee_pull, knee_pull_rotate])

        let f_knee_stride_seq = SKAction.sequence([knee_stride,knee_reset,knee_pull,knee_reset])
        let f_knee_pull_seq = SKAction.sequence([knee_pull_group_half, knee_reset, knee_stride, knee_reset])


        f_leg_calf.runAction(SKAction.repeatActionForever(f_knee_stride_seq))
        b_leg_calf.runAction(SKAction.repeatActionForever(f_knee_pull_seq))          
    }

我知道它可能难以阅读，我已经为自己很好地记录了它。 f_ 前缀代表“front”leg，b 代表“back”_leg。然而，将其视为右腿和左腿。

无论如何!提前致谢!我感谢任何帮助或提示!评论任何进一步的解释! :)

Answer 1

更有效的方法是使用 SKPhysicsJoint 将大腿节点连接到小腿节点。