3D
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ui
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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class FlowTarget : MonoBehaviour
{
public enum mode
{
ui = 1,
d3 = 2,
}
public GameObject item;
public int mindis = 5;
public int maxdis = 20;
public mode type = mode.ui;
public GameObject target;
public Canvas ui_Canvas;
public Camera UI_Camera;
public Camera sceneCamera;// camera.main
// Update is called once per frame
void Update()
{
if (target)
{
if (type == mode.ui)
{
var dis = Vector3.Distance(sceneCamera.transform.position, target.transform.position);
if (dis <= mindis || dis > maxdis)
{
item.gameObject.SetActive(false);
}
else
{
item.gameObject.SetActive(true);
Vector2 mouseDown = sceneCamera.WorldToScreenPoint(target.transform.position);
bool isRect = RectTransformUtility.ScreenPointToLocalPointInRectangle(ui_Canvas.transform as RectTransform, mouseDown, UI_Camera, out var mouseUGUIPos);
if (isRect && IsInView(target.transform.position))
{
transform.GetComponent<RectTransform>().anchoredPosition = mouseUGUIPos;
}
else
{
item.gameObject.SetActive(false);
}
}
}
else
{
var dis = Vector3.Distance(sceneCamera.transform.position, target.transform.position);
if (dis <= mindis || dis > maxdis)
{
item.gameObject.SetActive(false);
}
else
{
// 翻转了,需要处理floatitemroot,x=-1
transform.position = target.transform.position;
transform.LookAt(sceneCamera.transform, Vector3.up);
/*Vector2 mouseDown = sceneCamera.WorldToViewportPoint(target.transform.position);
if (IsInView(target.transform.position))
{
item.gameObject.SetActive(true);
transform.position = mouseDown;
transform.LookAt(sceneCamera.transform);
}
else
{
item.gameObject.SetActive(false);
}*/
}
}
}
}
public bool IsInView(Vector3 worldPos)
{
if (type == mode.ui)
{
Transform camTransform = sceneCamera.transform;
Vector2 viewPos = sceneCamera.WorldToViewportPoint(worldPos);
Vector3 dir = (worldPos - camTransform.position).normalized;
float dot = Vector3.Dot(camTransform.forward, dir);// 检测对象是否在相机的正前面
if (dot > 0 && viewPos.x >= 0 && viewPos.x <= 1 && viewPos.y >= 0 && viewPos.y <= 1)
return true;
else
return false;
}
else
{
Transform camTransform = sceneCamera.transform;
Vector2 viewPos = sceneCamera.WorldToViewportPoint(worldPos);
Vector3 dir = (worldPos - camTransform.position).normalized;
float dot = Vector3.Dot(camTransform.forward, dir);// 检测对象是否在相机的正前面
if (dot > 0 && viewPos.x >= 0 && viewPos.x <= 1 && viewPos.y >= 0 && viewPos.y <= 1)
return true;
else
return false;
}
}
}
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