set_period
Description:
Sets the period of the page curling, between 0.0 (no curling) and 1.0 (fully curled)
Parameters:
| this | |
| period | 
           the period of the page curl, between 0.0 and 1.0  | 
      
Sets the period of the page curling, between 0.0 (no curling) and 1.0 (fully curled)
| this | |
| period | 
           the period of the page curl, between 0.0 and 1.0  |