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## Copyright (C) 2024 David Legland
## 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.
function varargout = drawArrow(varargin)
%DRAWARROW Draw an arrow on the current axis.
%
% drawArrow(x1, y1, x2, y2)
% draws an arrow between the points (x1 y1) and (x2 y2).
%
% drawArrow([x1 y1 x2 y2])
% gives argument as a single array.
%
% drawArrow(..., L, W)
% specifies length and width of the arrow.
%
% drawArrow(..., L, W, TYPE)
% also specifies arrow type. TYPE can be one of the following :
% 0: draw only two strokes
% 1: fill a triangle
% 0.5: draw a half arrow (try it to see ...)
%
% Arguments can be single values or array of size N-by-1. In this case,
% the function draws multiple arrows.
%
% H = drawArrow(...)
% return handle(s) to created arrow elements.
% The handles are returned in a structure with the fields
% 'body', 'wing' and 'head' containing the handles to the different
% parts of the arrow(s).
%
% Example
% t = linspace(0, 2*pi, 200);
% figure; hold on;
% plot(t, sin(t));
% drawArrow([2 -1 pi 0], .1, .05, .5)
%
% See also
% drawEdge
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2004-11-11, from drawEdge
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE
% extract handle of axis to draw on
if isAxisHandle(varargin{1})
ax = varargin{1};
varargin(1) = [];
else
ax = gca;
end
if isempty (varargin)
error ('should specify at least one argument');
end
% parse arrow coordinates
var = varargin{1};
if size (var, 2) == 4
x1 = var(:,1);
y1 = var(:,2);
x2 = var(:,3);
y2 = var(:,4);
varargin = varargin(2:end);
elseif length (varargin) > 3
x1 = varargin{1};
y1 = varargin{2};
x2 = varargin{3};
y2 = varargin{4};
varargin = varargin(5:end);
else
error ('MatGeom:drawArrow:invalidArgumentNumber', ...
'wrong number of arguments, please read the doc');
end
N = size (x1, 1);
% default values
l = 10 * ones (N, 1); % Body length
w = 5 * ones (N, 1); % Head width
r = 0.1 * ones (N, 1); % Head to body ratio
h = zeros (N, 1); % Head type
if ~isempty (varargin)
% Parse parameters
k = length (varargin);
vartxt = 'lwrh';
cmd = ['%s = varargin{%d}; %s = %s(:);' ...
'if length (%s) < N; %s = %s(1) * ones (N , 1); end'];
for i = 1:k
v = vartxt(i);
eval (sprintf (cmd, v, i, v, v, v, v, v));
end
end
hold on;
oldHold = ishold(ax);
if ~oldHold
hold on;
end
axis equal;
% angle of the edge
theta = atan2(y2-y1, x2-x1);
rl = r .* l;
rh = r .* h;
cT = cos (theta);
sT = sin (theta);
% point on the 'left'
xa1 = x2 - rl .* cT - w .* sT / 2;
ya1 = y2 - rl .* sT + w .* cT / 2;
% point on the 'right'
xa2 = x2 - rl .* cT + w .* sT / 2;
ya2 = y2 - rl .* sT - w .* cT / 2;
% point on the middle of the arrow
xa3 = x2 - rh .* cT;
ya3 = y2 - rh .* sT;
% draw main edge
tmp = line(ax, [x1.'; x2.'], [y1.'; y2.'], 'color', [0 0 1]);
handle.body = tmp;
% draw only 2 wings
ind = find (h == 0);
if ~isempty (ind)
tmp = line ([xa1(ind).'; x2(ind).'], [ya1(ind).'; y2(ind).'], ...
'color', [0 0 1]);
handle.wing(:,1) = tmp;
tmp = line ([xa2(ind).'; x2(ind).'], [ya2(ind).'; y2(ind).'], ...
'color', [0 0 1]);
handle.wing(:,2) = tmp;
end
% draw a full arrow
ind = find (h ~= 0);
if ~isempty(ind)
tmp = patch (ax, ...
[x2(ind) xa1(ind) xa3(ind) xa2(ind) x2(ind)].', ...
[y2(ind) ya1(ind) ya3(ind) ya2(ind) y2(ind)].', [0 0 1]);
handle.head = tmp;
end
% format output arguments
if nargout > 0
varargout{1} = handle;
end
if ~oldHold
hold off;
end
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