function ch=getLegendableChildren(ax,N)

%GET_LEGENDABLE_CHILDREN Gets the children for a legend

%  CH=GET_LEGENDABLE_CHILDREN(AX,N) returns the

%  legendable children for axes AX. 

%  N - is the threshold for the number of axes children to be returned.

%  If N is not provided than all the axes children will be tested for being legendable   

% Copyright 2004-2019 The MathWorks, Inc.

legkids = allchild(ax); 

if nargin > 1 

    legkids(N:end) = [];

end 

% Take plotyy axes into account:

if matlab.graphics.illustration.internal.isplotyyaxes(ax) 

    newAx = getappdata(ax,'graphicsPlotyyPeer');

    newChil = get(newAx,'Children');

    % The children of the axes of interest (passed in) should

    % appear lower in the stack than those of its plotyy peer.

    % The child stack gets flipud at the end of this function in

    % order to return a list in creation order.

    if ~isempty(newChil)

        legkids = [newChil(:); legkids(:)];

    else

        legkids = legkids(:);

    end            

end 

if isempty(legkids) 

    ch = matlab.graphics.primitive.Data.empty;

    return

end 

% exclude non-legendable objects

legkids = legkids(matlab.graphics.illustration.internal.islegendable(legkids)); 

% support for hggroup

legkids = matlab.graphics.illustration.internal.expandLegendChildren(legkids); 

% We need to return a list of legendable children in creation order, but

% the axes 'Children' property returns a stack (reverse creation order).

% So we flip it.

ch = flipud(legkids);