1 files changed, 123 insertions, 0 deletions
diff --git a/inst/geom2d/drawCircleArc.m b/inst/geom2d/drawCircleArc.m
new file mode 100644
index 0000000..fe5db04
--- /dev/null
+++ b/inst/geom2d/drawCircleArc.m
@@ -0,0 +1,123 @@
+%% Copyright (c) 2011, INRA
+%% 2003-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% 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 COPYRIGHT HOLDER 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 copyright holder.
+
+%% -*- texinfo -*-
+%% @deftypefn {Function File} {@var{h} = } drawCircleArc (@var{xc}, @var{yc}, @var{r}, @var{start}, @var{end})
+%% @deftypefnx {Function File} {@var{h} = } drawCircleArc (@var{arc})
+%% @deftypefnx {Function File} {@var{h} = } drawCircleArc (@dots{}, @var{param}, @var{value})
+%% Draw a circle arc on the current axis
+%%
+%%   drawCircleArc(XC, YC, R, START, EXTENT);
+%%   Draws circle with center (XC, YC), with radius R, starting from angle
+%%   START, and with angular extent given by EXTENT. START and EXTENT angles
+%%   are given in degrees.
+%%
+%%   drawCircleArc(ARC);
+%%   Puts all parameters into one single array.
+%%
+%%   drawCircleArc(..., PARAM, VALUE);
+%%   specifies plot properties by using one or several parameter name-value
+%%   pairs.
+%%
+%%   H = drawCircleArc(...);
+%%   Returns a handle to the created line object.
+%%
+%%   @example
+%%     % Draw a red thick circle arc
+%%     arc = [10 20 30 -120 240];
+%%     figure;
+%%     axis([-50 100 -50 100]);
+%%     hold on
+%%     drawCircleArc(arc, 'LineWidth', 3, 'Color', 'r')
+%% @end example
+%%
+%%   @seealso{circles2d, drawCircle, drawEllipse}
+%% @end deftypefn
+
+function varargout = drawCircleArc(varargin)
+
+  if nargin == 0
+      error('Need to specify circle arc');
+  end
+
+  circle = varargin{1};
+  if size(circle, 2) == 5
+      x0  = circle(:,1);
+      y0  = circle(:,2);
+      r   = circle(:,3);
+      start   = circle(:,4);
+      extent  = circle(:,5);
+      varargin(1) = [];
+      
+  elseif length(varargin) >= 5
+      x0  = varargin{1};
+      y0  = varargin{2};
+      r   = varargin{3};
+      start   = varargin{4};
+      extent  = varargin{5};
+      varargin(1:5) = [];
+      
+  else
+      error('drawCircleArc: please specify center, radius and angles of circle arc');
+  end
+
+  % convert angles in radians
+  t0  = deg2rad(start);
+  t1  = t0 + deg2rad(extent);
+
+  % number of line segments
+  N = 60;
+
+  % initialize handles vector
+  h   = zeros(length(x0), 1);
+
+  % draw each circle arc individually
+  for i = 1:length(x0)
+      % compute basis
+      t = linspace(t0(i), t1(i), N+1)';
+
+      % compute vertices coordinates
+      xt = x0(i) + r(i)*cos(t);
+      yt = y0(i) + r(i)*sin(t);
+      
+      % draw the circle arc
+      h(i) = plot(xt, yt, varargin{:});
+  end
+
+  if nargout > 0
+      varargout = {h};
+  end
+
+
+endfunction
+