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    $acnv->rotate(TagOrID, angle ?,x, y?)
    This method rotates the object identified by TagOrID by angle. The ang
    +le is specified in degrees. If an x, y coordinate is specified, then 
    +the object is rotated about that point. Otherwise, the object is rota
    +ted about its center point, if that can be determined.
    
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    As it stands, the module can only rotate the following object types ab
    +out their centers:
    
    ...
    Rectangles (if rectToPoly(1) is called)
    Ovals (if ovalToPoly(1) is called)
    All other object types (bitmap, image, arc, text, && window) can only 
    +be rotated about another point. A warning is issued if the user tries
    + to rotate one of these object types about their center. Hopefully, m
    +ore types will be able to center-rotate in the future.
    
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    use Tk;
    use Tk::AbstractCanvas;
    ...
    
    MainLoop; 
    ();