rotate around pivot issue

rotate.cs

// enstead of this
GUIUtility.RotateAroundPivot(angle, 
          new Vector2(brushRect.x + brushRect.width  * relativePivot.x, 
                      brushRect.y + brushRect.height * relativePivot.y)
          );
          
          
/////// should use 
		Matrix4x4 getMatrix(Rect rect){
		Matrix4x4 result;
		Vector2 v =new Vector2(rect.x + (rect.width * relativePivot.x) ,
		                       rect.y + (rect.height * relativePivot.y)) ;
		float scaleX = Screen.width  / (float) GameData.instance.screenSize.x;
		float scaleY = Screen.height / (float) GameData.instance.screenSize.y;
		result =Matrix4x4.Scale(new Vector3(scaleX, scaleY, 1)) 
				* Matrix4x4.TRS ( v, Quaternion.Euler(0,0,angle) , Vector3.one)
				* Matrix4x4.TRS (-v, Quaternion.identity       , Vector3.one);
		return result;
	}