bind_handle ( self )

binds the three handles

create_items ( self )

four items are created:

• handle rectangle for mu

• handle line for mu+sigma

• handle line for mu-sigma

• line between two sigma handles

get_values ( self )

returns internal value cache

set_values ( self,  values )

takes (mu,sigma) as value

start_move_event ( self,  event )

finds out, which part of the handle is selected and prepares for move tracing

values_from_mouse ( self,  event )

project the value to the handle base line and calculate new value