/usr/share/octave/packages/geometry-1.7.0/geom2d/drawArrow.m is in octave-geometry 1.7.0-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | ## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## 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.
## -*- 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
if size(varargin{1}, 2)==4
x1 = varargin{1}(:,1);
y1 = varargin{1}(:,2);
x2 = varargin{1}(:,3);
y2 = varargin{1}(:,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('wrong number of arguments, please read the doc');
end
l = 10*size(size(x1));
w = 5*ones(size(x1));
h = zeros(size(x1));
# exctract length of arrow
if ~isempty(varargin)
l = varargin{1};
if length(x1)>length(l)
l = l(1)*ones(size(x1));
end
end
# extract width of arrow
if length(varargin)>1
w = varargin{2};
if length(x1)>length(w)
w = w(1)*ones(size(x1));
end
end
# extract 'ratio' of arrow
if length(varargin)>2
h = varargin{3};
if length(x1)>length(h)
h = h(1)*ones(size(x1));
end
end
hold on;
axis equal;
# angle of the edge
theta = atan2(y2-y1, x2-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
tmp = line([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([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
if nargout>0
varargout{1} = handle;
end
endfunction
%!demo
%! # Orthogonal projection respect to vector b
%! dim = 2;
%! b = 2*rand(dim,1);
%! P = eye(dim) - (b*b')/(b'*b);
%! v = 2*rand(dim,1)-1;
%! Pv = P*v;
%!
%! # Draw the vectors
%! clf;
%! h = drawArrow ([zeros(3,dim) [b'; v'; Pv']],0.1,0.1);
%!
%! # Color them
%! arrayfun(@(x,y)set(x,'color',y), [h.body; h.wing(:)],repmat(['rgb']',3,1));
%! # Name them
%! legend (h.body, {'b','v','Pv'},'location','northoutside','orientation','horizontal');
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