MoveDirection.Left

説明

This is the Left state of MoveDirection. Assign functionality for moving to the left.

Use the Left state for an easily identifiable way of moving a GameObject to the left (-1 , 0 , 0). This is a state without any predefined functionality. Before using this state, you should define what your GameObject will do in code.

//Assign this script to a visible GameObject (with a Rigidbody attached) to see this 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_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 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 left
            case MoveDirection.Left:
                //This moves the Rigidbody to the left (minus right Vector)
                m_Rigidbody.velocity = -m_RightVector * 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;
        }
    }
}