%   The SCALE controls allow the user to change the size
%of the function without changing its shape, orientaion,
%or the position of the point Y.  The value displayed is
%"sqrt(abs(det(A)))", where A is the standard matrix
%corresponding to the linear transformation.
%   The LENGTH controls allow the user to change the
%lengths of sides XY or YZ, while maintaining all angles,
%the lengths of two of the sides, and the position of the
%point Y.  The user may toggle between sides XY and YZ by
%clicking the button on which these lables appear. This
%allows the user to make the function "taller" or "wider".
%The max value is 1.4, just slightly less than sqrt(2),
%the longest line which will fit in the unit square.
%   The FLIP buttons flip the current function about the
%indicated axis:
% ! : the line x=0.5
% - : the line y=0.5
% / : the line y=x    (connecting (0,0) & (1,1))
% \ : the line y=1-x  (connecting (1,0) & (0,1))
%These buttons are especially usefull when used along with
%the COPY button (see FCN SELECTION), as they allow the
%user to make identical copies symmetric to some axis
%(many of the most interesting fractals have some degree
%of symmetry).