function  color_fiber_loc_plot (from) 
% Copyright 2007, J.E. Akin.  All rights reserved.
%  ------------------------------------------------------
%             bare minimum borders
%  Matlab program to calculate & plot 2-D FE meshes
%  ------------------------------------------------------

% c_x    = x coordinates of nod_per_el line polygon
% c_y    = y coordinates of nod_per_el line polygon
% inc_e  = increment in element numbers on plot, if > 0
% inc_p  = increment in node numbers on plot, if > 0
% msh_typ_nodes   = connectivity list for elements, nt x nod_per_el
% loop   = corners for nod_per_el line polygon
% lab_p  = 1, if node points are circled
  lab_p  = 0;
% nod_per_el = Nodes per element
% np     = Number of Points
% nt     = Number of elements
% pre_e  = Element items before type & connectivity list
% pre_p  = Nodal items before coordinates
% LIST1DN_001 = Nodal coordinates (with preceeding data)
% t_x    = x coordinates of nod_per_el corners
% t_y    = y coordinates of nod_per_el corners
% x_bar  = x-centroid of each element
% xy     = Coordinates of points, np x 2
% y_bar  = y-centroid of each element

pre_e  = 0  ;
pre_p = 0;
if ( nargin == 0 )
  from  = 0 ;
end %if

    if ( from == 0 )
      name_n = ['LIST1DN.tmp'];
      name_e = ['LIST1DE.tmp'];
      name_r = ['fiber_result.tmp'];
    else
      if ( from < 10 )
        name_n = ['LIST1DN_00', int2str(from), '.tmp'];
        name_e = ['LIST1DE_00', int2str(from), '.tmp'];
        name_e = ['fiber_result_00', int2str(from), '.tmp'];
      elseif ( from < 100 )
        name_n = ['LIST1DN_0', int2str(from), '.tmp'];
        name_e = ['LIST1DE_0', int2str(from), '.tmp'];
        name_e = ['fiber_result_0', int2str(from), '.tmp'];
      else
        name_n = ['LIST1DN_', int2str(from), '.tmp'];
        name_e = ['LIST1DE_', int2str(from), '.tmp'];
        name_e = ['fiber_result_', int2str(from), '.tmp'];
      end % if
    end % if
    
    fid_n = fopen (name_n, 'r') ;
    fid_e = fopen (name_e, 'r') ;
    fid_r = fopen (name_r, 'r') ;

  %    load the file arrays
    Fiber_xy = fscanf (fid_n, '%g  \n', [inf]) ;
    Fiber_ij = fscanf (fid_e, '%g  \n', [inf]) ;
    Fiber_T  = fscanf (fid_r, '%g  \n', [inf]) ;


%    Set control data: number of points
  !b load LIST1DN_001.tmp ;  
  np = size (Fiber_xy,1) ;   % number of nodal points  
  ns = size (Fiber_xy,2) - pre_p ;   % dimension of space
  if ( np == 0 )
    error ('Error missing file Fiber_xy.tmp')
  end % if error

  x (np)      = 0.       ;       % pre-allocate array x
  y (np)      = 0.       ;       % pre-allocate array y

  % Fiber_xy has: pre_p items then: x, y
  x = Fiber_xy (1:np, (pre_p+1)) ; % extract x  %CL
  y = Fiber_xy (1:np, (pre_p+2)) ; % extract y %CL
  z = (Fiber_T (1:np, 1) + Fiber_T (1:np, 2)) * 0.5
  V_X = max (max ( Fiber_T ))
  V_N = min (min ( Fiber_T ))
  
%    Set control data: number elements & nodes_per_element
  !b load  LIST1DE_001.tmp ; % nod_per_el nodes per element
  nt = size (Fiber_ij,1);           % number of elements 
  if ( nt == 0 )
    error ('Error missing file Fiber_ij.tmp')
  end % if error
  nod_per_el = size (Fiber_ij,2) - pre_e ; % nodes per element
  Col_1 = 1 ;
  Col_2 = 2 ; 

  x_bar (nt)  = 0.       ;       % pre-allocate array x_bar
  y_bar (nt)  = 0.       ;       % pre-allocate array y_bar
  t_nodes (nod_per_el) = 0 ;    % Optional pre-allocation
  t_x (nod_per_el) = 0 ;        % Optional pre-allocation
  t_y (nod_per_el) = 0 ;        % Optional pre-allocation
  c_x (nod_per_el + 1) = 0 ;    % Optional pre-allocation
  c_y (nod_per_el + 1) = 0 ;    % Optional pre-allocation
 
%                set constants
  [loop] = [ 1, 2, 1]  ;             

%    Initialize plots
  xmax = max (x)      ; xmin = min (x) ;
  ymax = max (y)      ; ymin = min (y) ;
  !b xdiff = xmax - xmin ; ydiff = ymax - ymin ;

  clf                               % clear graphics
  axis ([xmin, xmax, ymin, ymax])   % set axes
  axis ('equal')                    % true shape style
  hold on                           % hold image for plots
  grid                              % add grid dots
  xlabel ('X')                      % add label
  ylabel ('Y')                      % add label

  title  (['FE Fiber Geometry: ', int2str(nt), ...
           ' Elements, ', int2str(np),' Nodes', ...
            ' (', int2str(nod_per_el), ' per element)'])
 
  Rank_X = 8 ; Rank_N = 1;       % for color scale
  caxis([Rank_N Rank_X]) ; % set full color ranges

%    Loop over all elements
  for it = 1:nt  ;

%      Extract corner connectivity 
    t_nodes = Fiber_ij ((it), Col_1:Col_2 ) ; %CL

%      Extract corner coordinates
    t_x  = x (t_nodes) ;         % x at those nodes, only
    t_y  = y (t_nodes) ;         % y at those nodes, only
    t_z  = z (t_nodes) ;         % y at those nodes, only

%      Get the centroid
    x_bar (it) = sum (t_x' )/nod_per_el ;
    y_bar (it) = sum (t_y' )/nod_per_el ;

%      Plot this polygon
    c_x  = t_x (loop) ;       % x for nod_per_el line polygon
    c_y  = t_y (loop) ;       % y for nod_per_el line polygon

    V_R = z (it) ;
    Rank = round ((Rank_X * (V_R-V_N) + Rank_N * (V_X-V_R)) / V_XN);
    plot (c_x, c_y, Rank)           % plot nod_per_el lines
  end % for over all elements
  colorbar
 
  hold off
% end of color_fiber_loc_plot



%b %      Rank the colors
    %b Rank = Rank - 1 ;
    %b if ( Rank == 0 )
      %b Rank = 7 ;
    %b end % if

%b % scale colors as one set of 7
    %b if     ( Rank == 7) ; color = 'r' ; % red
    %b elseif ( Rank == 6) ; color = 'y' ; % yellow
    %b elseif ( Rank == 5) ; color = 'g' ; % green
    %b elseif ( Rank == 4 ) ; color = 'b' ; % blue
    %b elseif ( Rank == 3 ) ; color = 'c' ; % cyan
    %b elseif ( Rank == 2 ) ; color = 'm' ; % magenta
    %b elseif ( Rank == 1 ) ; color = 'w' ; % white
    %b else                 ; color = 'k' ; % black (impossible ??)
    %b end % if for rank color