Class CMNorthArrow extends CMItem
  CMNorthArrow
  Class for creating north arrows that can point north.  The north arrows are provided by SVG
  files.  NoarthArrows are added to the view.
 
  
  Copyright (C) 2020, Humboldt State University, Jim Graham 
  
  This program is free software: you can redistribute it and/or modify it under the terms of the GNU General 
  Public License as published by the Free Software  Foundation, either version 3 of the License, or (at your 
  option) any later  version. 
   
  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the 
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
  for more details. 
  
  You should have received a copy of the GNU General Public License along with this program. If not, see 
  
Settings Group: NorthArrow
| Setting | Name | Type | Options | Default | Comments | 
|---|---|---|---|---|---|
| Scale | Scale | CMTYPE_FLOAT | 1 | ||
| ClassName | Class Name | CMTYPE_STRING | CM_NorthArrow | link to the SVG file that contains the arrow | |
| URL | URL | CMTYPE_STRING | null |