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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 = drawCenteredEdge(varargin)
%DRAWCENTEREDEDGE Draw an edge centered on a point.
%
% Draws a centered edge, defined by a center, a length and an orientation
% (in degrees). This function can be used to draw principal axes of an
% ellipse or of an oriented box.
%
%
% drawCenteredEdge(EDGE)
% Draws an edge centered on a point. EDGE has format [XC YC L THETA],
% with (Xc, YC) being edge center, L being the edge length, and THETA
% beigng the edge orientation, in degrees (counted Counter-clockwise from
% horizontal).
% Input argument can also be a N-by-4 array, in that can several edges
% are drawn.
%
% drawCenteredEdge(CENTER, L, THETA)
% Specifies argument in seperate inputs.
%
% drawCenteredEdge(..., NAME, VALUE)
% Also specifies drawing options by using one or several parameter name -
% value pairs (see doc of plot function for details).
%
% drawCenteredEdge(AX, ...)
% Specifies the axis to draw the edge on.
%
% H = drawCenteredEdge(...)
% Returns handle(s) to the created edges(s).
%
% Example
% % Draw an ellipse with its two axes
% figure(1); clf;
% center = [50 40];
% r1 = 30; r2 = 10;
% theta = 20;
% elli = [center r1 r2 theta];
% drawEllipse(elli, 'linewidth', 2);
% axis([0 100 0 100]); axis equal;
% hold on;
% edges = [center 2*r1 theta ; center 2*r2 theta+90];
% drawCenteredEdge(edges, 'linewidth', 2, 'color', 'g');
%
% See also
% edges2d, drawOrientedBox, drawEllipse, centeredEdgeToEdge, drawEdge
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2005-08-05
% Copyright 2005-2023 INRA - TPV URPOI - BIA IMASTE
%% process input variables
if nargin < 1
error('Function requires an input argument');
end
% extract handle of axis to draw on
if isAxisHandle(varargin{1})
ax = varargin{1};
varargin(1) = [];
else
ax = gca;
end
var = varargin{1};
if size(var, 2) == 4
% manage edge in single parameter
len = var(:, 3);
theta = var(:, 4);
center = var(:, 1:2);
N = size(center, 1);
varargin(1) = [];
elseif length(varargin) >= 3
% parameters given in different arguments
% size of data
center = varargin{1};
len = varargin{2};
theta = varargin{3};
varargin(1:3) = [];
% ensure all data have same size
NP = size(center, 1);
NL = size(len, 1);
ND = size(theta, 1);
N = max([NP NL ND]);
if N > 1
if NP == 1, center = repmat(center, [N 1]); end
if NL == 1, len = repmat(len, [N 1]); end
if ND == 1, theta = repmat(theta, [N 1]); end
end
end
% extract drawing options
options = varargin(:);
%% Draw edges
% coordinates of center point
xc = center(:, 1);
yc = center(:, 2);
% convert angle to radians
theta = theta * pi / 180;
% computation shortcuts
cot = cos(theta);
sit = sin(theta);
% compute starting and ending points
x1 = xc - len .* cot / 2;
x2 = xc + len .* cot / 2;
y1 = yc - len .* sit / 2;
y2 = yc + len .* sit / 2;
% save hold state
holdState = ishold(ax);
hold(ax, 'on');
% draw the edges
h = zeros(N, 1);
for i = 1:N
h(i) = plot(ax, [x1(i) x2(i)], [y1(i) y2(i)]);
end
% apply style to edges
if ~isempty(options) > 0
for i = 1:N
set(h(i), options{:});
end
end
%% Format output
% restore hold state
if ~holdState
hold(ax, 'off');
end
% process output arguments
if nargout > 0
varargout = {h};
end
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