PlotMeshTriangleNumber.m

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function PlotMeshTriangleNumber(varargin)
% PlotMeshTriangleNumber(varargin)
%   Write mesh triangles numbers on figure
%
% parameters:
%   Th  : mesh structure
%   BackgroundColor : set triangles numbers background box colors
%   EdgeColor : set triangles numbers box edge color
%   Color : set triangles numbers colors
%   FontSize : set triangles numbers font size
%
% Example:
%  @verbatim 
%   PlotMeshNodeNumber(Th,'Color',[1 0 0]);@endverbatim
%  \image html images/PlotBounds.png "figure : PlotBounds(Th,\'LineWidth\',2);"
%
% See also:
% 
p = inputParser; 
p.addRequired('Th', @isstruct);
%  
p.addParamValue('BackgroundColor', [1 1 1], @isnumeric );
p.addParamValue('FontSize', 10, @isnumeric );
p.addParamValue('Color', [0 0 0] , @isnumeric );
p.addParamValue('EdgeColor', [0 0 0] , @isnumeric );
p.parse(varargin{:});

q=p.Results.Th.q;
me=p.Results.Th.me;
nme=p.Results.Th.nme;
PrevHold=SetHoldOn(true);
C=(q(:,me(1,:))+q(:,me(2,:))+q(:,me(3,:)))/3;
text(C(1,:),C(2,:),num2str([1:nme]'), ...
     'BackgroundColor',p.Results.BackgroundColor,'Color',p.Results.Color, ...
     'FontSize',p.Results.FontSize,'EdgeColor', p.Results.EdgeColor, ...
     'HorizontalAlignment','center'); 
RestoreHold(PrevHold)