DGF
Vertex       % some additional points
 -1 -1
  1 -1
  1  1
 -1  1
 0.75 0.75   % inside the interval
 0.9 0.9     % also inside the interval
 1.25 1.25   % and one outside of the interval
#
Simplexgenerator
min-angle 30    % quality enhancment
max-area 0.01   % area restriction
display 0       % show result using Triangle viewer

% to use Triangle from a certain path, uncomment this path line
%path $HOME/bin      % path to Triangle
#
BOUNDARYSEGMENTS
1 0 1
2 1 6 3 0
#
# examplegrid2d.dgf

