MoveDirection

説明

This is an 8 direction movement enum.

MoveDirection provides a way of switching between moving states. You must assign these states to actions, such as moving the GameObject by an up vector when in the Up state.

Having states like these are easier to identify than always having to include a large amount of vectors and calculations. Instead, you define what you want the state to do in only one part, and switch to the appropriate state when it is needed.

//This is a full example of how a GameObject changes direction using MoveDirection states
//Assign this script to a visible GameObject (with a Rigidbody attached) to see it in action

using UnityEngine;
using UnityEngine.EventSystems;

public class Example : MonoBehaviour
{
    Vector3 m_StartPosition, m_StartForce;
    Rigidbody m_Rigidbody;
    //Use Enum for easy switching between direction states
    MoveDirection m_MoveDirection;

    //Use these Vectors for moving Rigidbody components
    Vector3 m_ResetVector;
    Vector3 m_UpVector;
    Vector3 m_RightVector;
    const float speed = 5.0f;

    void Start()
    {
        //You get the Rigidbody component attached to the GameObject
        m_Rigidbody = GetComponent<Rigidbody>();
        //This starts with the Rigidbody not moving in any direction at all
        m_MoveDirection = MoveDirection.None;

        //These are the GameObject’s starting position and Rigidbody position
        m_StartPosition = transform.position;
        m_StartForce = m_Rigidbody.transform.position;

        //This Vector is set to 1 in the y axis (for moving upwards)
        m_UpVector = Vector3.up;
        //This Vector is set to 1 in the x axis (for moving in the right direction)
        m_RightVector = Vector3.right;
        //This Vector is zeroed out for when the Rigidbody should not move
        m_ResetVector = Vector3.zero;
    }

    void Update()
    {
        //This switches the direction depending on button presses
        switch (m_MoveDirection)
        {
            //The starting state which resets the object
            case MoveDirection.None:
                //Reset to the starting position of the GameObject and Rigidbody
                transform.position = m_StartPosition;
                m_Rigidbody.transform.position = m_StartForce;
                //This resets the velocity of the Rigidbody
                m_Rigidbody.velocity = m_ResetVector;
                break;

            //This is for moving in an upwards direction
            case MoveDirection.Up:
                //Change the velocity so that the Rigidbody travels upwards
                m_Rigidbody.velocity = m_UpVector * speed;
                break;

            //This is for moving left
            case MoveDirection.Left:
                //This moves the Rigidbody to the left (minus right Vector)
                m_Rigidbody.velocity = -m_RightVector * speed;
                break;

            //This is for moving right
            case MoveDirection.Right:
                //This moves the Rigidbody to the right
                m_Rigidbody.velocity = m_RightVector * speed;
                break;

            //This is for moving down
            case MoveDirection.Down:
                //This moves the Rigidbody down
                m_Rigidbody.velocity = -m_UpVector * speed;
                break;
        }
    }

    void OnGUI()
    {
        //Press the reset Button to switch to no mode
        if (GUI.Button(new Rect(100, 0, 150, 30), "Reset"))
        {
            //Switch to start/reset case
            m_MoveDirection = MoveDirection.None;
        }

        //Press the Left button to switch the Rigidbody direction to the left
        if (GUI.Button(new Rect(100, 30, 150, 30), "Move Left"))
        {
            //Switch to the left direction
            m_MoveDirection = MoveDirection.Left;
        }

        //Press the Up button to switch the Rigidbody direction to upwards
        if (GUI.Button(new Rect(100, 60, 150, 30), "Move Up"))
        {
            //Switch to Up Direction
            m_MoveDirection = MoveDirection.Up;
        }

        //Press the Down button to switch the direction to down
        if (GUI.Button(new Rect(100, 90, 150, 30), "Move Down"))
        {
            //Switch to Down Direction
            m_MoveDirection = MoveDirection.Down;
        }

        //Press the right button to switch to the right direction
        if (GUI.Button(new Rect(100, 120, 150, 30), "Move Right"))
        {
            //Switch to Right Direction
            m_MoveDirection = MoveDirection.Right;
        }
    }
}

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