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function [bonds,components] = rbg2abg(rbonds,rstrokes,rcomponents,rports,infofile)
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if nargin<5
infofile='stdout';
end;
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function [bonds,components] = rbg2abg(rbonds,rstrokes,rcomponents,rports,infofile)
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %% Revision 1.1 1996/08/04 18:30:14 peter
% %% Initial revision
% %%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if nargin<5
infofile='stdout';
end;
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% Write out bond list sorted by port number (if any)
for j = 1:length(sort_index)
jj = sort_index(j);
components(i,j) = signed_bond_list(jj);
end;
end;
% Find out location of centre and ends of stroke.
if n_strokes>0
causality = zeros(n_bonds,2);
end;
for i = 1:n_strokes
stroke = [stroke_centre(i,:)
stroke_end_1(i,:)
stroke_end_2(i,:)];
% Find the nearest bond end.
[index,distance] = adjbond(stroke(1,:),arrow_end,other_end);
if (distance>2*stroke_length(i))
info = sprintf('Stroke at (%4.3f,%4.3f) is %4.3f away from the nearest bond\n', ...
stroke(1,1)/scale, stroke(1,2)/scale, distance/scale);
end;
% Bond end coordinates
j = index(1,1);
which_end = index(1,2)==1;
bond_end = arrow_end(j,:)*which_end + other_end(j,:)*(1-which_end);
% Now decide which bit of the stroke is nearest
stroke_index = adjbond(bond_end,stroke,zeros(size(stroke)));
if stroke_index(1)==1 % uni-causal stroke
causality(j,1:2) = (2*which_end-1)*[1 1];
else % bicausal stroke
% Find out whether stroke is on flow side of bond
stroke_direction = stroke(1,:) - stroke(stroke_index(1),:);
flow_side = stroke_direction*arrow_vector(j,:)'>0;
causality(j,1+flow_side) = 2*which_end-1;
end;
end;
bonds = causality;
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% Write out bond list sorted by port number (if any)
for j = 1:length(sort_index)
jj = sort_index(j);
components(i,j) = signed_bond_list(jj);
end;
end;
% Deduce causality from the strokes (if any).
causality = zeros(n_bonds,2);
if n_strokes>0
% Find out location of centre and ends of stroke.
stroke_end_1 = [rstrokes(:,1) rstrokes(:,2)];
stroke_end_2 = [rstrokes(:,3) rstrokes(:,4)];
stroke_centre = (stroke_end_1 + stroke_end_2)/2;
stroke_vector = (stroke_end_1 - stroke_end_2);
stroke_length = length2d(stroke_vector);
% Deduce bond causality from the strokes
for i = 1:n_strokes
stroke = [stroke_centre(i,:)
stroke_end_1(i,:)
stroke_end_2(i,:)];
% Find the nearest bond end.
[index,distance] = adjbond(stroke(1,:),arrow_end,other_end);
if (distance>2*stroke_length(i))
info = sprintf('Stroke at (%4.3f,%4.3f) is %4.3f away from the nearest bond\n', ...
stroke(1,1)/scale, stroke(1,2)/scale, distance/scale);
end;
% Bond end coordinates
j = index(1,1);
which_end = index(1,2)==1;
bond_end = arrow_end(j,:)*which_end + other_end(j,:)*(1-which_end);
% Now decide which bit of the stroke is nearest
stroke_index = adjbond(bond_end,stroke,zeros(size(stroke)));
if stroke_index(1)==1 % uni-causal stroke
causality(j,1:2) = (2*which_end-1)*[1 1];
else % bicausal stroke
% Find out whether stroke is on flow side of bond
stroke_direction = stroke(1,:) - stroke(stroke_index(1),:);
flow_side = stroke_direction*arrow_vector(j,:)'>0;
causality(j,1+flow_side) = 2*which_end-1;
end;
end;
end;
bonds = causality;
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