UnityEditor 用Gizmos画出类似NGUI，UIPanel的矩形框

来源：互联网发布：萨迪克哈佐维克数据编辑：程序博客网时间：2024/05/16 10:53

using UnityEngine;
using System.Collections;
using UnityEditor;
public class CamDrawGizmo : Editor {

    [DrawGizmo(GizmoType.Selected)]
    static void DrawRect(Transform transform, GizmoType gizmoType)
    {
        float z = transform.position.z - Camera.main.transform.localPosition.z;
        //摄像机的位置
        Vector3 camPos = Camera.main.transform.position;
        //transform的位置
        Vector3 transformPos = transform.position;
        float height = z*2.0f*Mathf.Tan(Camera.main.GetComponent<Camera>().fieldOfView/2.0f*Mathf.Deg2Rad);
        float width = height * Camera.main.GetComponent<Camera>().aspect;

        Vector3[] corners = new Vector3[4];
        if (transform.parent != null) {
            //确保GameObject移动的时候，矩形框不跟着移动，所以矩形框的中心点和Camer是对齐的,
            //我现在要做的是，在矩形框的4个角上，标注出位置，这个位置指：只要在GameObject的Position中输入这个位置，
            //那么GameObject就会移出画面（对于不同的Z）
            //所以这个时候这4个角上的位置，要转化为父节点下的相对坐标点
            //transform.parent.worldToLocalMatrix(point) == transform.parent.InverseTransformPoint(point)
            //transform.parent.localToWorldMatrix.MultiplyPoint(point) == transform.parent.TransformPoint(point);

            corners[0] = (transform.parent.worldToLocalMatrix.MultiplyPoint (new Vector3 (camPos.x - width / 2, camPos.y - height / 2, transformPos.z)));
            corners[1] = (transform.parent.worldToLocalMatrix.MultiplyPoint (new Vector3 (camPos.x - width / 2, camPos.y + height / 2, transformPos.z)));
            corners[2] = (transform.parent.worldToLocalMatrix.MultiplyPoint (new Vector3 (camPos.x + width / 2, camPos.y + height / 2, transformPos.z)));
            corners[3] = (transform.parent.worldToLocalMatrix.MultiplyPoint (new Vector3 (camPos.x + width / 2, camPos.y - height / 2, transformPos.z)));
        }

        else{
            corners[0] = new Vector3 (camPos.x - width / 2, camPos.y - height / 2, transformPos.z);
            corners[1] = new Vector3 (camPos.x - width / 2, camPos.y + height / 2, transformPos.z);
            corners[2] = new Vector3 (camPos.x + width / 2, camPos.y + height / 2, transformPos.z);
            corners[3] = new Vector3 (camPos.x + width / 2, camPos.y - height / 2, transformPos.z);
        }
        //
        for (int i = 0; i<4; i++) {
            corners[i].z = transformPos.z;
        }

        Vector3[] lablePos = new Vector3[4];
        lablePos[0] = new Vector3 (camPos.x - width / 2, camPos.y - height / 2, transformPos.z);
        lablePos[1] = new Vector3 (camPos.x - width / 2, camPos.y + height / 2, transformPos.z);
        lablePos[2] = new Vector3 (camPos.x + width / 2, camPos.y + height / 2, transformPos.z);
        lablePos[3] = new Vector3 (camPos.x + width / 2, camPos.y - height / 2, transformPos.z);

        for (int i = 0; i<4; i++) {
            //4个角上的确切位置是相对于世界坐标系的，但是标注的string是表示的相对于父节点的坐标
            Handles.Label(lablePos[i], corners[i].ToString ());
        }

        Gizmos.color = Color.green;
        //rect的位置
        Vector3 rectPos = camPos;
        rectPos.z = transformPos.z;
        Gizmos.DrawWireCube(rectPos, new Vector3(width, height, 0));
    }

}

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