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%% Copyright (c) 2011, INRA
%% 2004-2011, 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} = } drawArrow (@var{x1}, @var{y1}, @var{x2}, @var{y2})
%% @deftypefnx {Function File} {@var{h} = } drawArrow ([@var{ @var{x1}} @var{ @var{y1}} @var{x2} @var{y2}])
%% @deftypefnx {Function File} {@var{h} = } drawArrow (@dots{}, @var{L}, @var{W})
%% @deftypefnx {Function File} {@var{h} = } drawArrow (@dots{}, @var{L}, @var{W},@var{TYPE})
%% Draw an arrow on the current axis.
%%
%% draw an arrow between the points (@var{x1} @var{y1}) and (@var{x2} @var{y2}).
%% The points can be given as a single array. @var{L}, @var{W} specify length
%% and width of the arrow.
%%
%% Also specify arrow type. @var{TYPE} can be one of the following :
%% 0: draw only two strokes
%% 1: fill a triangle
%% .5: draw a half arrow (try it to see ...)
%%
%% Arguments can be single values or array of size [N*1]. In this case,
%% the function draws multiple arrows.
%%
%% @end deftypefn
function varargout = drawArrow(varargin)
if isempty(varargin)
error('should specify at least one argument');
end
% parse arrow coordinate
var = varargin{1};
if size(var, 2)==4
@var{x1} = var(:,1);
@var{y1} = var(:,2);
x2 = var(:,3);
y2 = var(:,4);
varargin = varargin(2:end);
elseif length(varargin)>3
@var{x1} = varargin{1};
@var{y1} = varargin{2};
x2 = varargin{3};
y2 = varargin{4};
varargin = varargin(5:end);
else
error('wrong number of arguments, please read the doc');
end
l = 10*size(size( @var{x1}));
w = 5*ones(size( @var{x1}));
h = zeros(size( @var{x1}));
% exctract length of arrow
if ~isempty(varargin)
l = varargin{1};
if length( @var{x1})>length(l)
l = l(1)*ones(size( @var{x1}));
end
end
% extract width of arrow
if length(varargin)>1
w = varargin{2};
if length( @var{x1})>length(w)
w = w(1)*ones(size( @var{x1}));
end
end
% extract 'ratio' of arrow
if length(varargin)>2
h = varargin{3};
if length( @var{x1})>length(h)
h = h(1)*ones(size( @var{x1}));
end
end
hold on;
axis equal;
% angle of the edge
theta = atan2(y2- @var{y1}, x2- @var{x1});
% point on the 'left'
xa1 = x2 - l.*cos(theta) - w.*sin(theta)/2;
ya1 = y2 - l.*sin(theta) + w.*cos(theta)/2;
% point on the 'right'
xa2 = x2 - l.*cos(theta) + w.*sin(theta)/2;
ya2 = y2 - l.*sin(theta) - w.*cos(theta)/2;
% point on the middle of the arrow
xa3 = x2 - l.*cos(theta).*h;
ya3 = y2 - l.*sin(theta).*h;
% draw main edge
line([ @var{x1}'; x2'], [ @var{y1}'; y2'], 'color', [0 0 1]);
% draw only 2 wings
ind = find(h==0);
line([xa1(ind)'; x2(ind)'], [ya1(ind)'; y2(ind)'], 'color', [0 0 1]);
line([xa2(ind)'; x2(ind)'], [ya2(ind)'; y2(ind)'], 'color', [0 0 1]);
% draw a full arrow
ind = find(h~=0);
patch([x2(ind) xa1(ind) xa3(ind) xa2(ind) x2(ind)]', ...
[y2(ind) ya1(ind) ya3(ind) ya2(ind) y2(ind)]', [0 0 1]);
if nargout>0
varargout{1}=h;
end
endfunction
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