Vertical line class, draw the model according to two latitude and longitude points
    
| Name | Type | Description | 
|---|---|---|
a0 | 
            Number | Horizontal stress at the lowest point. | 
r | 
            Number | Specifies the specific loading of the wire. | 
Members
- 
    Horizontal stress at the lowest point.
- 
    Default Value:
    
 
80 - 
    The interpolation number when the pole (hanging point) is equal height, set to an even number, the default is 0.
- 
    Default Value:
    
 
0 - 
    Wire specific load.
- 
    Default Value:
    
 
35.187 * 0.001 
