需求：下方的四个物体需要吸附到上方的物体上，且吸附成功成为上方物体的子物体，且上方物体有且最多只能有一个子物体，吸附不成功下方物体返回到原位置。
注意：1.父物体下面的子物体的位置要考虑为localPosition
2.第九层为Plane,给Plane设置layer
3.OnMouseUp为最终状态，脑子记住这点很重要
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class IsXiFu : MonoBehaviour {
private bool isMove = false;
private Vector3 OldPos;
private bool IsEnter = false;
private bool IsExit = false;
private Transform newParentTra;
void Start () {
OldPos = transform.position;
}
void Update () {
if (isMove)
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
//只和第九层检测
if (Physics.Raycast(ray, out hit, 500f, 1 << 9))
{
Debug.DrawLine(ray.origin, hit.point, Color.red);
transform.position = hit.point;
}
}
}
private void OnMouseDown()
{
Debug.Log("11111111111111111");
Debug.Log("鼠标按下");
isMove = true;
}
private void OnMouseUp()
{
Debug.Log("鼠标抬起");
isMove = false;
if (IsEnter)
{
Debug.Log("位置归零");
transform.parent = newParentTra;
transform.localPosition = new Vector3(0, 0, 0);
//相对父级的位置用localPosition
IsEnter = false;
IsExit = false;
}
if (IsExit)
{
Debug.Log("回归原位置");
transform.parent = null;
transform.position = OldPos;
isMove = false;
}
}
private void OnTriggerEnter(Collider other)
{
if (other.transform.tag == "Target")
{
if (other.transform.childCount==0)
{
IsEnter = true;
Debug.Log("找到目标");
newParentTra = other.transform;
}
else
{
Debug.Log("子物体已经被占用");
IsExit = true;
}
}
}
private void OnTriggerExit(Collider other)
{
Debug.Log("物体拖出");
IsExit = true;
}
}
产生的问题，当鼠标按下物体的一瞬间，物体会产生小小的“震动”，这是物体的点和射线打击地面的点产生的偏差，下面我们将要求出偏差，代码如下：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class IsXiFu : MonoBehaviour {
private bool isMove = false;
private Vector3 OldPos;
private Vector3 screenSpace;
private Vector3 offset;
private bool IsEnter = false;
private bool IsExit = false;
private Transform newParentTra;
//private Transform thistrans;
// Use this for initialization
void Start () {
OldPos = transform.position;
//Debug.Log(OldPos);
}
void Update () {
if (isMove)
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
//只和第九层检测
if (Physics.Raycast(ray, out hit, 500f, 1 << 9))
{
Debug.DrawLine(ray.origin, hit.point, Color.red);
//if (hit.collider.tag == "A")
//{
//打击点的位置
Debug.Log("hit.point" + hit.point);
//标签为A的位置
Debug.Log("A的位置：" + transform.position);
//将物体的世界坐标转换成屏幕坐标
screenSpace = Camera.main.WorldToScreenPoint(transform.position);
Debug.Log("hit.point的屏幕坐标" + screenSpace);
//偏移值（世界坐标）=物体的坐标（世界坐标）-屏幕上的点的世界坐标
offset = transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));
Debug.Log("世界坐标下物体和屏幕坐标转成世界坐标的偏移量" + offset);
}
}
}
private void OnMouseDown()
{
Debug.Log("11111111111111111");
Debug.Log("鼠标按下");
isMove = true;
//Debug.Log("鼠标按下的位置："+Input.mousePosition);
}
private void OnMouseUp()
{
Debug.Log("鼠标抬起");
isMove = false;
if (IsEnter)
{
Debug.Log("位置归零");
transform.parent = newParentTra;
transform.localPosition = new Vector3(0, 0, 0);
//相对父级的位置用localPosition
IsEnter = false;
IsExit = false;
}
if (IsExit)
{
Debug.Log("回归原位置");
transform.parent = null;
transform.position = OldPos;
isMove = false;
}
}
private void OnMouseDrag()
{
//屏幕上的点的坐标
Vector3 currentScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);
Debug.Log("鼠标点击屏幕的坐标" + currentScreenSpace);
//物体的当前位置=屏幕上的点的坐标转成世界坐标+偏移值
Vector3 currentPos = Camera.main.ScreenToWorldPoint(currentScreenSpace) + offset;
Debug.Log("1111鼠标点击屏幕的坐标转成世界" + currentScreenSpace);
Debug.Log("2222应当到的位置" + currentPos);
transform.position = currentPos;
}
//private void OnCollisionEnter(Collision collision)
//{
// if (collision.transform.tag=="Target")
// {
// //Debug.Log("找到父亲");
// //Debug.Log(collision.transform.position);
// collision.gameObject.GetComponent<Renderer>().material.color = Color.blue;
// //Vector3 newVec = new Vector3(collision.transform.position.x, collision.transform.position.y * 2, collision.transform.position.z);
// //transform.position = newVec;
// Destroy(transform.GetComponent<BoxCollider>());
// //Destroy(collision.transform.GetComponent<BoxCollider>());
// transform.parent = collision.transform;
// transform.position = new Vector3(0, 0, 0);
// //Debug.Log(transform.position);
// }
//}
private void OnTriggerEnter(Collider other)
{
if (other.transform.tag == "Target")
{
if (other.transform.childCount==0)
{
IsEnter = true;
Debug.Log("找到目标");
////Destroy(transform.GetComponent<BoxCollider>());
newParentTra = other.transform;
}
else
{
Debug.Log("子物体已经被占用");
IsExit = true;
}
}
}
private void OnTriggerExit(Collider other)
{
Debug.Log("物体拖出");
IsExit = true;
}
}