这是我在Monkey X中用来尝试构建游戏的代码，最后的方法应该在游戏中绘制精灵，但它似乎注册为错误并且不允许该方法存在，是否存在我可以解决这个问题

Import mojo

Class Vec2D
    Field x: Float
    Field y: Float

    Method New (x: Float = 0, y: Float = 0)
        set( x, y)
    End

    Method set (x: Float, y: Float)
        Self.x = x
        Self.y = y
    End
End

Class Vec2Di
    Field x: int
    Field y: int

    Method New (x: int = 0, y: int = 0)
        set( x, y)
    End

    Method set (x: int, y: int)
        Self.x = x
        Self.y = y
    End
End

Class Player
    Field OriginalPosition: Vec2D
    Field Position: Vec2D
    Field Velocity: Vec2D

    Field SpeedLR: Float = 2.0
    Field SpeedUD: Float = 4.0

    Field leftKey: Int
    Field rightKey: Int
    Field upKey: Int
    Field downKey: Int

    Method New(leftKey: Int, rightKey: Int, upKey: Int, downKey:Int, x: Float, y: Float)
        OriginalPosition = New Vec2D(x, y)
        Position = New Vec2D(x, y)
        Velocity = New Vec2D()

        Self.leftKey = leftKey
        Self.rightKey = rightKey
        Self.upKey = upKey
        Self.downKey = downKey

    End

    Method Update()
        Velocity.x = 0
        Velocity.y = 0

        If KeyDown (leftKey)
            Velocity.x = -SpeedLR
        If KeyDown (rightKey)
            Velocity.x = SpeedLR

        If KeyDown (upKey)
            Velcity.y = SpeedUD
        If KeyDown (downKey)
            Velocity.y = -SpeedUD

        End

        Position.x += Velocity.x
        Position.y += Velocity.y

    End

    Method Draw()
        SetColor (0, 255, 0)

        DrawRect (Position.x-16, Position.y-16, 32, 32)

    End

End

在此之后，我查看了我的游戏的主要类别，除了这个之外它没有任何问题，并且由于其他原因，我似乎无法找到它的问题，但我努力尝试 . 我一直在关注如何在游戏中绘制精灵的教程，这与他做的完全相同，但它仍然不会注册方法 . 有没有人有任何想法，我可以解决这个问题，让游戏运行 .

monkey-x