[cb]SceneView 获取鼠标位置

时间：2021-03-25 10:20:04

扩展需求

在Scene视图中获取鼠标的位置

Demo

在Scene视图中，当鼠标点击时实例化一个Cube

[cb]SceneView 获取鼠标位置

重点部分

[cb]SceneView 获取鼠标位置 [cb]SceneView 获取鼠标位置

[cb]SceneView 获取鼠标位置

[cb]SceneView 获取鼠标位置

实现代码

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(MyGrid))]
public class MyGridInspector : Editor
{
    MyGrid grid;
public void OnEnable()
    {
        grid = (MyGrid)target;//初始化时获取引用
        SceneView.onSceneGUIDelegate += GridUpdate;//获取SceneView的输入
    }

public void OnDisable()
    {
// SceneView.onSceneGUIDelegate -= GridUpdate;
    }

public override void OnInspectorGUI()
    {


        GUILayout.BeginHorizontal();
        GUILayout.Label("网格宽度");
        grid.width = EditorGUILayout.FloatField(grid.width, GUILayout.Width(50));
        GUILayout.EndHorizontal();

        GUILayout.BeginHorizontal();
        GUILayout.Label("网格高度");
        grid.height = EditorGUILayout.FloatField(grid.height, GUILayout.Width(50));
        GUILayout.EndHorizontal();

if (GUILayout.Button("打开Grid Window", GUILayout.Width(255)))
        {
            MyGridWindow window = (MyGridWindow)EditorWindow.GetWindow(typeof(MyGridWindow));
            window.Init();
        }

        SceneView.RepaintAll();//SceneView重绘
    }

void GridUpdate(SceneView sceneview)
    {
        Event e = Event.current;//获取事件

if (e.isKey && e.character == 'a')
        {
//GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Cube);
            GameObject obj;

//如果选中Object
//if (Selection.activeObject)
//{
//    obj = (GameObject)Instantiate(Selection.activeObject);
//    obj.transform.position = Vector3.zero;
//}

//在Editor模式实例化一个Prefab
//if (Selection.activeObject)
//{
//    //找到Prefab
//    Object prefab =  PrefabUtility.GetPrefabParent(Selection.activeObject);
//    if (prefab)
//    {
//        obj = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
//        obj.transform.position = Vector3.zero;
//    }
//}


//根据鼠标点击的位置实例化Prefab
if (Selection.activeObject)
            {
//屏幕的鼠标坐标转换成世界坐标
/**
                 * 1、从屏幕发出射线
                 * 2、我们需要转化事件的屏幕空间的空间是可以接受的screenpointtoray()
                 * 3、e.mousePosition 左上角坐标(0,0)，右下角坐标(Camera.current.pixelWidth, -Camera.current.pixelHeight)，
                      把它转换成世界坐标变为左下角(0,9),右上角(Camera.current.pixelWidth, Camera.current.pixelHeight)
                 */
/* 
                 Ray r = Camera.current.ScreenPointToRay(new Vector3(e.mousePosition.x, -e.mousePosition.y + Camera.current.pixelHeight));
                 Vector3 mousePos = r.origin;//mousepos向量保存射线的来源
                 //找到Prefab
                 Object prefab = PrefabUtility.GetPrefabParent(Selection.activeObject);
                 if (prefab)
                 {
                     obj = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
                     obj.transform.position = new Vector3(mousePos.x,mousePos.y,0.0f);
                 }*/
            }

//将Cube对齐到网格中心位置？
if (Selection.activeObject)
            {
                Ray r = Camera.current.ScreenPointToRay(new Vector3(e.mousePosition.x, -e.mousePosition.y + Camera.current.pixelHeight));
                Vector3 mousePos = r.origin;//mousepos向量保存射线的来源
//找到Prefab
                Object prefab = PrefabUtility.GetPrefabParent(Selection.activeObject);
if (prefab)
                {
                    obj = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
                    Vector3 aligned = new Vector3(Mathf.Floor(mousePos.x / grid.width) * grid.width + grid.width / 2.0f,
                        Mathf.Floor(mousePos.y / grid.height) * grid.height + grid.height / 2.0f,
                        0.0f);

                    obj.transform.position = aligned;
                }
            }
        }
else if (e.isKey && e.character == 'n' && e.clickCount==0) //在当前鼠标位置创建一个Cube
        {
            Ray r = Camera.current.ScreenPointToRay(new Vector3(e.mousePosition.x, -e.mousePosition.y + Camera.current.pixelHeight));
            Vector3 mousePos = r.origin;//mousepos向量保存射线的来源

            GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Cube);
            Vector3 aligned = new Vector3(Mathf.Floor(mousePos.x / grid.width) * grid.width + grid.width / 2.0f,
                Mathf.Floor(mousePos.y / grid.height) * grid.height + grid.height / 2.0f,
                0.0f);

            obj.transform.position = aligned;
//注册撤消操作
            Undo.RegisterCreatedObjectUndo(obj, "Create" + obj.name);
            Debug.Log("create");

        }
else if (e.isKey && e.character == 'd')//删除选中的GameObject
        {
foreach (GameObject obj in Selection.gameObjects)
            {
                Debug.Log(obj.name);
                DestroyImmediate(obj);
            }
        }
else if (e.isKey && e.character == '1')
        {
            GameObject obj;
if (Selection.activeObject)
            {
                Ray r = Camera.current.ScreenPointToRay(new Vector3(e.mousePosition.x, -e.mousePosition.y + Camera.current.pixelHeight));
                Vector3 mousePos = r.origin;//mousepos向量保存射线的来源
//找到Prefab
                Object prefab = PrefabUtility.GetPrefabParent(Selection.activeObject);
if (prefab)
                {
                    obj = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
                    Vector3 aligned = new Vector3(Mathf.Floor(mousePos.x / grid.width) * grid.width + grid.width / 2.0f,
                        Mathf.Floor(mousePos.y / grid.height) * grid.height + grid.height / 2.0f,
                        0.0f);

                    obj.transform.position = aligned;
//注册撤消操作
                    Undo.RegisterCreatedObjectUndo(obj, "Create" + obj.name);
                    Debug.Log("create");
                }
            }
        }
//撤消单个对象实例
else if (e.isKey && e.character == '4')
        {
            GameObject obj;
if (Selection.activeObject)
            {
                Ray r = Camera.current.ScreenPointToRay(new Vector3(e.mousePosition.x, -e.mousePosition.y + Camera.current.pixelHeight));
                Vector3 mousePos = r.origin;//mousepos向量保存射线的来源
//找到Prefab
                Object prefab = PrefabUtility.GetPrefabParent(Selection.activeObject);
if (prefab)
                {
                    Undo.IncrementCurrentGroup();
                    obj = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
                    Vector3 aligned = new Vector3(Mathf.Floor(mousePos.x / grid.width) * grid.width + grid.width / 2.0f,
                        Mathf.Floor(mousePos.y / grid.height) * grid.height + grid.height / 2.0f,
                        0.0f);

                    obj.transform.position = aligned;
//注册撤消操作
                    Undo.RegisterCreatedObjectUndo(obj, "Create" + obj.name);
                    Debug.Log("create");
                }
            }
        }
    }
}

 

参考资料

http://code.tutsplus.com/tutorials/how-to-add-your-own-tools-to-unitys-editor--active-10047

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