Unity 编辑器开发SceneView GUI控制

前几天项目需要就做了个类似于Collider EditCollider的功能

下面是我做的效果

基础代码如下：

public class ExportCFGInputWindow : EditorWindow
{
    public static ExportCFGInputWindow instance;
    Vector3 dot1, dot2, dot3, dot4;
  
    void OnEnable() {
        instance = this;
        SceneView.duringSceneGui -= this.OnSceneGUI;
        SceneView.duringSceneGui += this.OnSceneGUI;
        dot1 = new Vector3(0, 0, 0);
        dot2 = new Vector3(0, 0, 1);
        dot3 = new Vector3(1, 0, 1);
        dot4 = new Vector3(1, 0, 0);
        mid1Cor = Color.green;
        mid2Cor = Color.green;
        mid3Cor = Color.green;
        mid4Cor = Color.green;
    }
    void OnDisable() {
        instance = null;
        SceneView.duringSceneGui -= this.OnSceneGUI;
    }

  
    void OnSceneGUI(SceneView sceneView)
    {
        Handles.color = Color.green;
        Handles.DrawAAPolyLine(2, dot1, dot2, dot3, dot4, dot1);
 
    }

}

效果如图

下面是我踩的坑

　　　　先不管先把小绿点画于是我在OnSceneGui方法里面插入了如下代码

void OnSceneGUI(SceneView sceneView)
    {
        Handles.color = Color.green;
        Handles.DrawAAPolyLine(2, dot1, dot2, dot3, dot4, dot1);

         Handles.DotHandleCap(0, new Vector3((dot1.x + dot2.x) * 0.5f, 0, (dot1.z + dot2.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);

　　　　　　//0.005f * sceneView.size 的作用是让小绿点无论你把场景放大或者缩小都是一样大。



         Handles.DotHandleCap(0, new Vector3((dot2.x + dot3.x) * 0.5f, 0, (dot2.z + dot3.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.DotHandleCap(0, new Vector3((dot3.x + dot4.x) * 0.5f, 0, (dot3.z + dot4.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.DotHandleCap(0, new Vector3((dot4.x + dot1.x) * 0.5f, 0, (dot4.z + dot1.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
       
    }

　　　　这是画完绿点的样子

　　　　虽然有了绿点但是没法控制于是我写了个方法来监听鼠标，这个方法在OnSceneGUI函数中调用。具体思路是：绿点的位置知道，只要监听鼠标在绿点下按下然后移动鼠标，我控制绿点两端的点跟着鼠标移动就可以完成了。

　　　　但是！万事都怕但是。出现了一个令我头大的问题：鼠标左键的EventType.MouseUp事件我监听不到（这个问题求好心人帮忙解释一下。）导致我无法停止对相应点的控制，当然鼠标中键和鼠标右键没有问题，但是鼠标中键和鼠标右键会在编辑器下有其他操作。于是我放弃了这个思路。（这里代码就不上了）

　　　　既然鼠标不行被逼无奈我就使用了键盘控制的方式，思路如下：

　　　　　　4键控制上图最左边的小绿点，8键控制最上面的小绿点，6键控制最右面的小绿点，2键控制最下面的小绿点。+键表示该点向外伸，-键表示该点向外内缩。

　　　　下面是代码

int ExportDir = 0;//移动方向
void CheckKey()//这个方法在OnSeneGui函数中调用
    {
        Event e = Event.current;
        if (e.type == EventType.KeyDown)
        {
            
            if (e.keyCode == KeyCode.Keypad4)
            {
                ExportDir = 4;
                mid1Cor = Color.red;
                mid2Cor = Color.green;
                mid3Cor = Color.green;
                mid4Cor = Color.green;
            }
            if (e.keyCode == KeyCode.Keypad6)
            {
                ExportDir = 6;
                mid1Cor = Color.green;
                mid2Cor = Color.green;
                mid3Cor = Color.red;
                mid4Cor = Color.green;
            }
            if (e.keyCode == KeyCode.Keypad2)
            {
                ExportDir = 2;
                mid1Cor = Color.green;
                mid2Cor = Color.green;
                mid3Cor = Color.green;
                mid4Cor = Color.red;
            }
            if (e.keyCode == KeyCode.Keypad8)
            {
                ExportDir = 8;
                mid1Cor = Color.green;
                mid2Cor = Color.red;
                mid3Cor = Color.green;
                mid4Cor = Color.green;
            }
            if (e.keyCode == KeyCode.KeypadPlus)
            {
                //ExportDir = 4;
                Plus(ExportDir);
            }
            if (e.keyCode == KeyCode.KeypadMinus)
            {
                //ExportDir = 4;
                Minus(ExportDir);
            }
        }
       
    }
　　float EditorSpeed = 0.05f;
    void Plus(int dir)
    {

        if (dir == 4)
        {
            dot1.x -= EditorSpeed;
            dot2.x -= EditorSpeed;
        }
        else if (dir == 6)
        {
            dot3.x += EditorSpeed;
            dot4.x += EditorSpeed;
        }
        else if (dir == 2)
        {
            dot1.z -= EditorSpeed;
            dot4.z -= EditorSpeed;
        }
        else if (dir == 8)
        {
            dot2.z += EditorSpeed;
            dot3.z += EditorSpeed;
        }
        else
        {
            return;
        }
    }
    void Minus(int dir)
    {

        if (dir == 4)
        {
            dot1.x += EditorSpeed;
            dot2.x += EditorSpeed;
        }
        else if (dir == 6)
        {
            dot3.x -= EditorSpeed;
            dot4.x -= EditorSpeed;
        }
        else if (dir == 2)
        {
            dot1.z += EditorSpeed;
            dot4.z += EditorSpeed;
        }
        else if (dir == 8)
        {
            dot2.z -= EditorSpeed;
            dot3.z -= EditorSpeed;
        }
        else
        {
            return;
        }
    }

　　　　　　这样一来我先按下数字键4在按下+键最左边的点就会向左移动了

　　　　　　为了显示清楚我还对小绿点显示颜色左了相应的处理，当选择哪个点做动作时它就会变红，代码如下

Color    mid1Cor = Color.green;
Color    mid2Cor = Color.green;
Color    mid3Cor = Color.green;
Color    mid4Cor = Color.green;
void OnSceneGUI(SceneView sceneView)
    {
        Handles.color = Color.green;
        Handles.DrawAAPolyLine(2, dot1, dot2, dot3, dot4, dot1);

        
         Handles.color = mid1Cor;
         Handles.DotHandleCap(0, new Vector3((dot1.x + dot2.x) * 0.5f, 0, (dot1.z + dot2.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.color = mid2Cor;
         Handles.DotHandleCap(0, new Vector3((dot2.x + dot3.x) * 0.5f, 0, (dot2.z + dot3.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.color = mid3Cor;
         Handles.DotHandleCap(0, new Vector3((dot3.x + dot4.x) * 0.5f, 0, (dot3.z + dot4.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.color = mid4Cor;
         Handles.DotHandleCap(0, new Vector3((dot4.x + dot1.x) * 0.5f, 0, (dot4.z + dot1.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         CheckKey();
       
    }

　　　　效果如下：

　　这个功能也能勉强满足需求，暂时就这样了。

　　后来有一天，我发现有人这样用

 Handles.FreeMoveHandle(target.pos,Quaternion.identity,2.0,Vector3.zero,Handles.DrawRectangle);

　　Handles类的FreeMoveHandle函数我马上查了一下API发现

public static Vector3 FreeMoveHandle(Vector3 position, Quaternion rotation, float size, Vector3 snap, DrawCapFunction capFunc);

　　最后一个参数是个委托。我一下子就明白改怎么弄了。代码如下

 void OnSceneGUI(SceneView sceneView)
    {
        Handles.color = Color.green;
        Handles.DrawAAPolyLine(2, dot1, dot2, dot3, dot4, dot1);

         float m1px = Handles.FreeMoveHandle(new Vector3((dot1.x + dot2.x) * 0.5f, 0, (dot1.z + dot2.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).x;
         dot1 = new Vector3(m1px, 0, dot1.z);
         dot2 = new Vector3(m1px, 0, dot2.z);

         float m2px = Handles.FreeMoveHandle(new Vector3((dot2.x + dot3.x) * 0.5f, 0, (dot2.z + dot3.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).z;
         dot2 = new Vector3(dot2.x, 0, m2px);
         dot3 = new Vector3(dot3.x, 0, m2px);

         float m3px = Handles.FreeMoveHandle(new Vector3((dot3.x + dot4.x) * 0.5f, 0, (dot3.z + dot4.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).x;
         dot3 = new Vector3(m3px, 0, dot3.z);
         dot4 = new Vector3(m3px, 0, dot4.z);

         float m4px = Handles.FreeMoveHandle(new Vector3((dot4.x + dot1.x) * 0.5f, 0, (dot4.z + dot1.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).z;
         dot4 = new Vector3(dot4.x, 0, m4px);
         dot1 = new Vector3(dot1.x, 0, m4px);

    }

　　这样就达到了我想要的鼠标控制小绿点的效果。但是键盘控制的代码我也保留了，因为我觉得这是个教训，而且在有时候键盘控制也蛮方便的。

完整代码如下：

public class ExportCFGInputWindow : EditorWindow
{
    public static ExportCFGInputWindow instance;
    Vector3 dot1, dot2, dot3, dot4;
    Color mid1Cor, mid2Cor, mid3Cor, mid4Cor;
    int ExportDir = 0;
    float EditorSpeed = 0.05f;
    void OnEnable() {
        instance = this;
        SceneView.duringSceneGui -= this.OnSceneGUI;
        SceneView.duringSceneGui += this.OnSceneGUI;
        dot1 = new Vector3(0, 0, 0);
        dot2 = new Vector3(0, 0, 1);
        dot3 = new Vector3(1, 0, 1);
        dot4 = new Vector3(1, 0, 0);
        mid1Cor = Color.green;
        mid2Cor = Color.green;
        mid3Cor = Color.green;
        mid4Cor = Color.green;
    }
    void OnDisable() {
        instance = null;
        SceneView.duringSceneGui -= this.OnSceneGUI;
    }

    Vector3 m1, m2, m3, m4;
    void OnSceneGUI(SceneView sceneView)
    {
        Handles.color = Color.green;
        Handles.DrawAAPolyLine(2, dot1, dot2, dot3, dot4, dot1);

         #region 鼠标控制
         float m1px = Handles.FreeMoveHandle(new Vector3((dot1.x + dot2.x) * 0.5f, 0, (dot1.z + dot2.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).x;
         dot1 = new Vector3(m1px, 0, dot1.z);
         dot2 = new Vector3(m1px, 0, dot2.z);

         float m2px = Handles.FreeMoveHandle(new Vector3((dot2.x + dot3.x) * 0.5f, 0, (dot2.z + dot3.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).z;
         dot2 = new Vector3(dot2.x, 0, m2px);
         dot3 = new Vector3(dot3.x, 0, m2px);

         float m3px = Handles.FreeMoveHandle(new Vector3((dot3.x + dot4.x) * 0.5f, 0, (dot3.z + dot4.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).x;
         dot3 = new Vector3(m3px, 0, dot3.z);
         dot4 = new Vector3(m3px, 0, dot4.z);

         float m4px = Handles.FreeMoveHandle(new Vector3((dot4.x + dot1.x) * 0.5f, 0, (dot4.z + dot1.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, Vector3.zero, Handles.DotCap).z;
         dot4 = new Vector3(dot4.x, 0, m4px);
         dot1 = new Vector3(dot1.x, 0, m4px);
         #endregion

         #region 键盘控制
         Handles.color = mid1Cor;
         Handles.DotHandleCap(0, new Vector3((dot1.x + dot2.x) * 0.5f, 0, (dot1.z + dot2.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.color = mid2Cor;
         Handles.DotHandleCap(0, new Vector3((dot2.x + dot3.x) * 0.5f, 0, (dot2.z + dot3.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.color = mid3Cor;
         Handles.DotHandleCap(0, new Vector3((dot3.x + dot4.x) * 0.5f, 0, (dot3.z + dot4.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         Handles.color = mid4Cor;
         Handles.DotHandleCap(0, new Vector3((dot4.x + dot1.x) * 0.5f, 0, (dot4.z + dot1.z) * 0.5f), Quaternion.identity, 0.005f * sceneView.size, EventType.Repaint);
         CheckKey();
         #endregion
         
    }
   
    void CheckKey()
    {
        Event e = Event.current;
        if (e.type == EventType.KeyDown)
        {
            
            if (e.keyCode == KeyCode.Keypad4)
            {
                ExportDir = 4;
                mid1Cor = Color.red;
                mid2Cor = Color.green;
                mid3Cor = Color.green;
                mid4Cor = Color.green;
            }
            if (e.keyCode == KeyCode.Keypad6)
            {
                ExportDir = 6;
                mid1Cor = Color.green;
                mid2Cor = Color.green;
                mid3Cor = Color.red;
                mid4Cor = Color.green;
            }
            if (e.keyCode == KeyCode.Keypad2)
            {
                ExportDir = 2;
                mid1Cor = Color.green;
                mid2Cor = Color.green;
                mid3Cor = Color.green;
                mid4Cor = Color.red;
            }
            if (e.keyCode == KeyCode.Keypad8)
            {
                ExportDir = 8;
                mid1Cor = Color.green;
                mid2Cor = Color.red;
                mid3Cor = Color.green;
                mid4Cor = Color.green;
            }
            if (e.keyCode == KeyCode.KeypadPlus)
            {
                //ExportDir = 4;
                Plus(ExportDir);
            }
            if (e.keyCode == KeyCode.KeypadMinus)
            {
                //ExportDir = 4;
                Minus(ExportDir);
            }
        }
       
    }
    void Plus(int dir)
    {

        if (dir == 4)
        {
            dot1.x -= EditorSpeed;
            dot2.x -= EditorSpeed;
        }
        else if (dir == 6)
        {
            dot3.x += EditorSpeed;
            dot4.x += EditorSpeed;
        }
        else if (dir == 2)
        {
            dot1.z -= EditorSpeed;
            dot4.z -= EditorSpeed;
        }
        else if (dir == 8)
        {
            dot2.z += EditorSpeed;
            dot3.z += EditorSpeed;
        }
        else
        {
            return;
        }
    }
    void Minus(int dir)
    {

        if (dir == 4)
        {
            dot1.x += EditorSpeed;
            dot2.x += EditorSpeed;
        }
        else if (dir == 6)
        {
            dot3.x -= EditorSpeed;
            dot4.x -= EditorSpeed;
        }
        else if (dir == 2)
        {
            dot1.z += EditorSpeed;
            dot4.z += EditorSpeed;
        }
        else if (dir == 8)
        {
            dot2.z -= EditorSpeed;
            dot3.z -= EditorSpeed;
        }
        else
        {
            return;
        }
    }
    private void OnGUI()
    {
        GUILayout.BeginVertical();
        //标签
        GUILayout.BeginHorizontal();
        GUILayout.Box("输入相应的参数", TitleBoxStyle(), GUILayout.Height(60),GUILayout.ExpandWidth(true));
        GUILayout.EndHorizontal();
        GUILayout.Space(10);
        
        GUILayout.BeginHorizontal();
        GUIStyle boxStyle = new GUIStyle();
        boxStyle.alignment = TextAnchor.MiddleCenter;
        GUILayout.Box("当前移动速度"+ EditorSpeed, boxStyle, GUILayout.Height(30), GUILayout.Width(80));
        GUILayout.Space(10);
        EditorSpeed = GUILayout.HorizontalSlider(EditorSpeed, 0.01f, 1);
        GUILayout.EndHorizontal();
       
        GUILayout.EndVertical();
    }
   
  
}

　　希望这次的分享对大家有点收获，不好的地方希望大家能帮我指出。

Unity 编辑器开发SceneView GUI控制

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