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## Copyright (C) 2003-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## The views and conclusions contained in the software and documentation are
## those of the authors and should not be interpreted as representing official
## policies, either expressed or implied, of the copyright holders.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{} =} drawPolyline (@var{}, @var{})
##DRAWPOLYLINE Draw a polyline specified by a list of points
##
## drawPolyline(COORD);
## packs coordinates in a single [N*2] array.
##
## drawPolyline(PX, PY);
## specifies coordinates in separate arrays. PX and PY must be column
## vectors with the same length.
##
## drawPolyline(..., TYPE);
## where TYPE is either 'closed' or 'open', specifies if last point must
## be connected to the first one ('closed') or not ('open').
## Default is 'open'.
##
## drawPolyline(..., PARAM, VALUE);
## specify plot options as described for plot command.
##
## H = drawPolyline(...) also return a handle to the list of line objects.
##
## Example:
## @example
## # Draw a curve representing an ellipse
## t = linspace(0, 2*pi, 100)';
## px = 10*cos(t); py = 5*sin(t);
## drawPolyline([px py], 'closed');
## axis equal;
##
## # The same, with different drawing options
## drawPolyline([px py], 'closed', 'lineWidth', 2, 'lineStyle', '--');
## @end example
##
## @seealso{polygons2d, drawPolygon}
## @end deftypefn
function varargout = drawPolyline(varargin)
# default values
closed = false;
# If first argument is a cell array, draw each curve individually,
# and eventually returns handle of each plot.
var = varargin{1};
if iscell(var)
h = [];
for i=1:length(var(:))
h = [h ; drawPolyline(var{i}, varargin{2:end})];
end
if nargout>0
varargout{1}=h;
end
return;
end
# extract curve coordinate
if size(var, 2)==1
# first argument contains x coord, second argument contains y coord
px = var;
if length(varargin)==1
error('Wrong number of arguments in drawPolyline');
end
py = varargin{2};
varargin = varargin(3:end);
else
# first argument contains both coordinate
px = var(:, 1);
py = var(:, 2);
varargin = varargin(2:end);
end
# check if curve is closed or open
if ~isempty(varargin)
var = varargin{1};
if strncmpi(var, 'close', 5)
closed = true;
varargin = varargin(2:end);
elseif strncmpi(var, 'open', 4)
closed = false;
varargin = varargin(2:end);
end
end
# if curve is closed, add first point at the end of the list
if closed
px = [px; px(1)];
py = [py; py(1)];
end
# plot the curve, with eventually optional parameters
h = plot(px, py, varargin{:});
# format output arguments
if nargout>0
varargout{1}=h;
end
endfunction
%!demo
%! t = linspace (0, 2*pi, 100)';
%! px = 10*cos (t); py = 5*sin (t);
%!
%! subplot (1,2,1)
%! drawPolyline ([px py], 'closed');
%! axis equal;
%!
%! subplot (1,2,2)
%! drawPolyline([px py], 'closed', 'lineWidth', 2, 'lineStyle', '--');
%! axis equal;
%! # -------------------------------------------------
%! # Draw a curve representing an ellipse with two drawing options