Unity相机移动之屏幕边缘检测

本文实例为大家分享了Unity相机移动之屏幕边缘检测的具体代码，供大家参考，具体内容如下

功能：

类似LOL 红警 相机移动方式。

鼠标移动到屏幕边缘，相机随之移动。

当然还有可以加亿一点点细节，比如鼠标指针变化，滚轮推进拉远视野，中键平移视野等。（没做）。

效果图：

这里做了可视化数据（可以看到限定的屏幕距离），线框内为检测的距离。

代码：

复制脚本，直接挂载相机上就可以用。

using UnityEngine;

/// <summary>
/// 相机边缘移动
/// </summary>
[RequireComponent(typeof(Camera))]
public class CameraScreenEdgeMove :MonoBehaviour
{

 [Header("使用边缘移动")]
 public bool isUseMoveOnScreenEdge = true;

 /// <summary>
 /// 打开调试
 /// </summary>
 public bool isDebugScreenEdge = true;

 //移动速度
 public float moveSpeed = 1f;

 /// <summary>
 /// 距离屏幕边缘多远就开始移动相机
 /// </summary>
 public int ScreenEdgeSize = 20;

 private bool MoveUp;
 private bool MoveDown;
 private bool MoveRight;
 private bool MoveLeft;

 private Rect RigthRect;
 private Rect UpRect;
 private Rect DownRect;
 private Rect LeftRect;

 private Material mat;
 private Vector3 dir = Vector3.zero;

 private void Start()
 {
 CreateLineMaterial();
 }

 private void Update()
 {
 if (isUseMoveOnScreenEdge)
 {
  UpRect = new Rect(1f, Screen.height - ScreenEdgeSize, Screen.width, ScreenEdgeSize);
  DownRect = new Rect(1f, 1f, Screen.width, ScreenEdgeSize);

  LeftRect = new Rect(1f, 1f, ScreenEdgeSize, Screen.height);
  RigthRect = new Rect(Screen.width - ScreenEdgeSize, 1f, ScreenEdgeSize, Screen.height);

  MoveUp = (UpRect.Contains(Input.mousePosition));
  MoveDown = (DownRect.Contains(Input.mousePosition));

  MoveLeft = (LeftRect.Contains(Input.mousePosition));
  MoveRight = (RigthRect.Contains(Input.mousePosition));

  dir.z = MoveUp ? 1 : MoveDown ? -1 : 0;
  dir.x = MoveLeft ? -1 : MoveRight ? 1 : 0;

  transform.position = Vector3.Lerp(transform.position, transform.position + dir * moveSpeed,Time.deltaTime);

 }
 }

 void CreateLineMaterial()
 {
 if (!mat)
 {
  Shader shader = Shader.Find("Hidden/Internal-Colored");
  mat = new Material(shader);
  mat.hideFlags = HideFlags.HideAndDontSave;
  mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
  mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
  mat.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
  mat.SetInt("_ZWrite", 0);
 }
 }

 void OnPostRender()
 {
 if (isUseMoveOnScreenEdge && isDebugScreenEdge)
 {
  DrawRect(UpRect, MoveUp, Color.cyan, Color.red);
  DrawRect(DownRect, MoveDown, Color.green, Color.red);
  DrawRect(LeftRect, MoveLeft, Color.yellow, Color.red);
  DrawRect(RigthRect, MoveRight, Color.blue, Color.red);
 }
 }

 private void DrawRect(Rect rect, bool isMouseEnter, Color normalColor, Color HeighLightColor)
 {
 if (isMouseEnter)
 {
  DrawScreenRect(rect, HeighLightColor);
 }
 else
 {
  DrawScreenRect(rect, normalColor);
 }
 }

 private void DrawScreenRect(Rect rect, Color color)
 {
 GL.LoadOrtho();
 GL.Begin(GL.LINES);
 {
  mat.SetPass(0);
  GL.Color(color);
  GL.Vertex3(rect.xMin / Screen.width, rect.yMin / Screen.height, 0);
  GL.Vertex3(rect.xMin / Screen.width, rect.yMax / Screen.height, 0);

  GL.Vertex3(rect.xMin / Screen.width, rect.yMax / Screen.height, 0);
  GL.Vertex3(rect.xMax / Screen.width, rect.yMax / Screen.height, 0);

  GL.Vertex3(rect.xMax / Screen.width, rect.yMax / Screen.height, 0);
  GL.Vertex3(rect.xMax / Screen.width, rect.yMin / Screen.height, 0);

  GL.Vertex3(rect.xMax / Screen.width, rect.yMin / Screen.height, 0);
  GL.Vertex3(rect.xMin / Screen.width, rect.yMin / Screen.height, 0);

 }
 GL.End();
 }

}

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