Handles.BeginGUI 开始界面

// Create a 180 degrees wire arc with a ScaleValueHandle attached to the disc
// that lets you modify the "shieldArea" var in the WireArcExample.js, also
// lets you visualize some info of the transform and finally lets you
// reset the shield area value to 5 by clicking on a button
//创建一个180度弧线带有ScaleValueHandle附加到圆
//让你可以在WireArcExample.js修改shieldArea变量
//并可以让你直观的看到一些变换的信息
//并最终通过点击一个按钮复位屏蔽区的值为5
@CustomEditor (DummyButtonScript)
class GUIButtonHandle extends Editor {
	function OnSceneGUI () {
		Handles.color = Color.blue;
		Handles.Label(target.transform.position + Vector3.up*2,
		target.transform.position.ToString() + "\nShieldArea: " +
		target.shieldArea.ToString());
		Handles.BeginGUI(Rect(Screen.width - 100, Screen.height - 80, 90,50));
		if(GUILayout.Button("Reset Area"))
		target.shieldArea = 5;
		Handles.EndGUI();

		Handles.DrawWireArc(target.transform.position,
			target.transform.up,
			-target.transform.right,
			180,
			target.shieldArea);
		target.shieldArea =
		Handles.ScaleValueHandle(target.shieldArea,
			target.transform.position + target.transform.forward*target.shieldArea,
			target.transform.rotation,
			1,
			Handles.ConeCap,
			1);
	}
}

// DummyButtonScript.js

var shieldArea : float = 5;