%% Copyright (c) 2011, INRA
%% 2011, David Legland <david.legland@grignon.inra.fr>
%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
%%
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%% (simplified BSD License)
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%%
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%%    list of conditions and the following disclaimer.
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%% -*- texinfo -*-
%% @deftypefn {Function File} {@var{hb} = } drawOrientedBox (@var{box})
%% @deftypefnx {Function File} {@var{hb} = } drawOrientedBox (@dots{}, @var{param}, @var{value})
%% Draw centered oriented rectangle.
%%   
%%   Syntax
%%   drawOrientedBox(BOX)
%%   drawOrientedBox(BOX, 'PropertyName', propertyvalue, ...)
%%
%%   Description
%%   drawOrientedBox(OBOX)
%%   Draws an oriented rectangle (or bounding box) on the current axis. 
%%   OBOX is a 1-by-5 row vector containing box center, dimension (length
%%   and width) and orientation (in degrees): 
%%   OBOX = [CX CY LENGTH WIDTH THETA].
%%
%%   When OBOX is a N-by-5 array, the N boxes are drawn.
%%
%%   HB = drawOrientedBox(...) 
%%   Returns a handle to the created graphic object(s). Object style can be
%%   modified using syntaw like:
%%   set(HB, 'color', 'g', 'linewidth', 2);
%%
%%   @seealso{drawPolygon, drawRect, drawBox}
%% @end deftypefn

function varargout = drawOrientedBox(box, varargin)

  %% Parses input arguments

  if nargin > 4 && sum(cellfun(@isnumeric, varargin(1:4))) == 4
      cx  = box;
      cy  = varargin{1};
      hl   = varargin{2} / 2;
      hw   = varargin{3} / 2;
      theta   = varargin{4};
      varargin = varargin(5:end);
  else
      cx  = box(:,1);
      cy  = box(:,2);
      hl   = box(:,3) / 2;
      hw   = box(:,4) / 2;
      theta = box(:,5);
  end


  %% Draw each box

  % allocate memory for graphical handle
  hr = zeros(length(cx), 1);

  % iterate on oriented boxes
  for i = 1:length(cx)
      % pre-compute angle data
      cot = cosd(theta(i));
      sit = sind(theta(i));
      
      % x and y shifts
      lc = hl(i) * cot;
      ls = hl(i) * sit;
      wc = hw(i) * cot;
      ws = hw(i) * sit;

      % coordinates of box vertices
      vx = cx(i) + [-lc + ws; lc + ws ; lc - ws ; -lc - ws ; -lc + ws];
      vy = cy(i) + [-ls - wc; ls - wc ; ls + wc ; -ls + wc ; -ls - wc];

      % draw polygons
      hr(i) = line(vx, vy, varargin{:});
  end


  %% Format output

  if nargout > 0
      varargout = {hr};
  end
  
endfunction

