Code covered by the BSD License  

Highlights from
SinkAutoConnect

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from SinkAutoConnect by Mike Anthony
Automatically connects single-inport blocks when block is dropped over a line in Simulink.

SinkAutoConnect
function SinkAutoConnect
% SinkAutoConnect.m
% Mike Anthony
% MathWorks
% Copyright (c) 2010, The MathWorks, Inc.
% All rights reserved.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are
% met:
%
%     * Redistributions of source code must retain the above copyright
%       notice, this list of conditions and the following disclaimer.
%     * Redistributions in binary form must reproduce the above copyright
%       notice, this list of conditions and the following disclaimer in
%       the documentation and/or other materials provided with the distribution
%     * Neither the name of the The MathWorks, Inc. nor the names
%       of its contributors may be used to endorse or promote products derived
%       from this software without specific prior written permission.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
% POSSIBILITY OF SUCH DAMAGE.

% Add a call to this function in they CopyFcn and MoveFcn callback of any block
% with signle or multiple inports and no outport. The block will automatically 
% connect when dropped on a signal line in a model.

% See if the block is connected
lineh = get_param(gcb,'LineHandles');

% If the block is not connected, look to make an autoconnection
if lineh.Inport(1) == -1
    % Find the port position
    porth = get_param(gcb,'PortHandles');
    
    for numi = 1:length(porth.Inport)
        port_pos = get_param(porth.Inport(numi),'Position');
        
        % Find the block position
        pos = get_param(gcb,'Position');
        
        % Check if block is on a signal line
        connect = false;
        % Create a line origin position
        line_pos = port_pos;
        line_pos(1) = line_pos(1)-10;
        
        % Add a line
        nl = add_line(gcs,[line_pos; port_pos]);
        
        % Check to see if the line you jsut added connected
        % (It's MUCH easier to add the line and see if it connected than check to
        % see if you should add the line in the first place)
        sph = get_param(nl,'SrcPortHandle');
        
        if sph ~= -1
            connect = true;
            slh = get_param(nl,'LineParent');
        end
        
        % If drawing this line connected the block, then move it
        if connect
            % Shift the block downward
            delta = pos(4)-pos(2);
            
            % Prevent Recursion warning
            try
                % Move the block
                set_param(gcb,'Position',[pos(1) pos(2)+delta pos(3) pos(4)+delta]);
            catch
            end
            
        else %else get rid of the temporary line
            delete_line(gcs,port_pos);
        end
    end
end

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