世界空间中变换的绿轴。
操作 GameObject 在世界空间中变换的 Y 轴(绿轴)上的位置。与 Vector3.up 不同,Transform.up 在移动 GameObject 时,还会考虑到其旋转。
旋转 GameObject 时,表示 GameObject 的 Y 轴的绿色箭头也会改变方向。Transform.up 沿绿色箭头所在的轴 (Y) 移动 GameObject。
要在沿 Y 轴移动 GameObject 时忽略旋转,请参阅 Vector3.up。
using UnityEngine;
public class Example : MonoBehaviour
{
Rigidbody2D m_Rigidbody;
float m_Speed;
void Start()
{
//Fetch the Rigidbody component you attach from your GameObject
m_Rigidbody = GetComponent<Rigidbody2D>();
//Set the speed of the GameObject
m_Speed = 10.0f;
}
void Update()
{
if (Input.GetKey(KeyCode.UpArrow))
{
//Move the Rigidbody upwards constantly at speed you define (the green arrow axis in Scene view)
m_Rigidbody.velocity = transform.up * m_Speed;
}
if (Input.GetKey(KeyCode.DownArrow))
{
//Move the Rigidbody downwards constantly at the speed you define (the green arrow axis in Scene view)
m_Rigidbody.velocity = -transform.up * m_Speed;
}
if (Input.GetKey(KeyCode.LeftArrow))
{
//rotate the sprite about the Z axis in the positive direction
transform.Rotate(new Vector3(0, 0, 1) * Time.deltaTime * m_Speed, Space.World);
}
if (Input.GetKey(KeyCode.RightArrow))
{
//rotate the sprite about the Z axis in the negative direction
transform.Rotate(new Vector3(0, 0, -1) * Time.deltaTime * m_Speed, Space.World);
}
}
}