AR判断识别图是否完全在扫描范围

Posted 2020-10-04 GamePal

using UnityEngine;
using UnityEngine.UI;

public class AreaCheck : MonoBehaviour {
    //"AreaCheck"类名 ，需要和外部脚本名称保持一致

    public Material Green_Mate;
    //申请材质变量储存绿色的材质
    public Material Red_Mate;
    //申请材质变量储存红色材质
    public Material Tran_Mate;
    //申请材质变量储存透明材质

    private CanvasScaler CanS;
    //申请变脸储存UI屏幕自适度的缩放组件

    private float X_Sc;
    //申请浮点型类型的变量储存实际的缩放比例

    //记录扫描框的范围
    private Vector2 TopLeft_UI;
    //记录扫描框左上角的坐标
    //“private”申请类型为私有
    private Vector2 BottomLeft_UI;
    //记录扫描框左下角的坐标
    private Vector2 TopRight_UI;
    //记录扫描框右上角的坐标
    private Vector2 BottomRight_UI;
    //记录扫描框右下角的坐标

    //记录面片的世界坐标
    private Vector3 TopLeft_Pl_W;
    //记录面片左上角的世界坐标
    private Vector3 BottomLeft_Pl_W;
    //记录面片左下角的世界坐标
    private Vector3 TopRight_Pl_W;
    //记录面片右上角的世界坐标
    private Vector3 BottomRight_Pl_W;
    //记录面片右下角的世界坐标

    //记录面片的屏幕坐标
    private Vector2 TopLeft_Pl_Sc;
    //记录面片左上角的屏幕坐标
    private Vector2 BottomLeft_Pl_Sc;
    //记录面片坐下角的屏幕坐标
    private Vector2 TopRight_Pl_Sc;
    //记录面片右上角的屏幕坐标
    private Vector2 BottomRight_Pl_Sc;
    //记录面片右下角的屏幕坐标

    private Vector2 PlaneWH;
    //记录面片的宽高


    //脚本刚开始运行的时候调用一次
    // Use this for initialization
    void Start () {
        
        CanS = GameObject.Find ("Canvas").gameObject.GetComponent<CanvasScaler> ();
        //获取控制屏幕自适度的组件

        X_Sc = Screen.width / CanS.referenceResolution.x;
        //获取实际的缩放比例
    
    }

    //每一帧都调用
    // Update is called once per frame
    void Update () {

        //计算了扫描框四个点的坐标位置，“*X_Sc"是屏幕自适度的缩放比例，这样才能获取真正运行时UI图片的宽高
        //TopLeft_UI = new Vector2 (Screen.width-400*X_Sc,Screen.height+300*X_Sc)*0.5f;
        TopLeft_UI = new Vector2(0,1080 * X_Sc);
        //给扫描框左上角的坐标赋值
        //"Screen.width-400,Screen.height+300" 屏幕的宽度减去扫描框的宽度，屏幕的高度减去扫描框的高度
        //BottomLeft_UI =new Vector2(Screen.width-400*X_Sc,Screen.height-300*X_Sc)*0.5f;
        BottomLeft_UI = new Vector2(0, 0);
        //给扫描框左下角的坐标赋值
        //TopRight_UI =new Vector2(Screen.width+400*X_Sc,Screen.height+300*X_Sc)*0.5f;
        TopRight_UI = new Vector2(1920 * X_Sc, 1080 * X_Sc);
        //给扫描框右上角的坐标赋值
        //BottomRight_UI =new Vector2(Screen.width+400*X_Sc,Screen.height-300*X_Sc)*0.5f;
        BottomRight_UI = new Vector2(1920 * X_Sc, 0);
        //给扫描框右下角的坐标赋值

        PlaneWH = new Vector2 (gameObject.GetComponent<MeshFilter>().mesh.bounds.size.x,gameObject.GetComponent<MeshFilter>().mesh.bounds.size.z)*0.5f * 0.1f; //0.1f=ImageTarget.scale*PlaneInScreen.scale
        //获取面片的宽高的一半
        //"gameObject.GetComponent<MeshFilter>().mesh.bounds.size.x"获取面片X方向的宽度
        //"*5"是因为开始获取到的长宽是模型本身的长宽，而场景中我们有缩放因素，父级物体放大了50倍，自身缩小到了0.1，因此获取实际宽高需要再乘以5

        //获取面片四个点的世界坐标
        TopLeft_Pl_W = gameObject.transform.parent.position + new Vector3 (-PlaneWH.x,0,PlaneWH.y);
        //获取面片左上角的世界坐标
        //"gameObject.transform.parent.position"物体的父级物体的世界坐标
        //"new Vector2 (-PlaneWH.x,PlaneWH.y)"向左上方偏移的量
        BottomLeft_Pl_W = gameObject.transform.parent.position + new Vector3 (-PlaneWH.x,0,-PlaneWH.y);
        //获取面片左下角的世界坐标
        TopRight_Pl_W = gameObject.transform.parent.position + new Vector3 (PlaneWH.x,0,PlaneWH.y);
        //获取面片右上角的世界坐标
        BottomRight_Pl_W = gameObject.transform.parent.position + new Vector3 (PlaneWH.x,0,-PlaneWH.y);
        //获取面片右下角的世界坐标


        //获取面片的屏幕坐标
        TopLeft_Pl_Sc=Camera.main.WorldToScreenPoint(TopLeft_Pl_W);
        //获取面片左上角的屏幕坐标
        //Camera.main.WorldToScreenPoint(Vector3()); 将世界坐标转化为屏幕坐标
        BottomLeft_Pl_Sc=Camera.main.WorldToScreenPoint(BottomLeft_Pl_W );
        //获取面片左下角的屏幕坐标
        TopRight_Pl_Sc=Camera.main.WorldToScreenPoint(TopRight_Pl_W);
        //获取面片右上角的屏幕坐标
        BottomRight_Pl_Sc=Camera.main.WorldToScreenPoint(BottomRight_Pl_W );
        //获取面片右下角的屏幕坐标

        //判断面片是否在扫描框范围内
        if(TopLeft_Pl_Sc.x>TopLeft_UI.x&&TopLeft_Pl_Sc.y<TopLeft_UI.y&&BottomLeft_Pl_Sc.x>BottomLeft_UI.x&&BottomLeft_Pl_Sc.y>BottomLeft_UI.y&&TopRight_Pl_Sc.x<TopRight_UI.x&&TopRight_Pl_Sc.y<TopLeft_UI.y&&BottomRight_Pl_Sc.x<BottomRight_UI.x&&BottomRight_Pl_Sc.y>BottomRight_UI.y){
        //当面片完全处于扫描框范围内时 执行以下代码
            gameObject.GetComponent<Renderer>().material=Green_Mate;
            //将脚本所附着的物体（面片）的材质变为绿色材质
            
        }else{
        //当面片并非完全处于扫描框范围内时  执行以下代码
            gameObject.GetComponent<Renderer>().material=Red_Mate;
            //将脚本所附着的物体（面片）的材质变为红色材质
        }
    
    }
}

工程设置