get_bounds
Description:
Compute the bounding box of a path.
Parameters:
| this | 
           a Path.  | 
      
| min_x | 
           return location for minimum x coordinate  | 
      
| max_x | 
           return location for maximum x coordinate  | 
      
| min_y | 
           return location for minimum y coordinate  | 
      
| max_y | 
           return location for maximum y coordinate  |