octave-geometry 1.7.0-1build1 / usr / share / octave / packages / geometry-1.7.0 / geom2d / drawEllipse.m

This file is indexed.

/usr/share/octave/packages/geometry-1.7.0/geom2d/drawEllipse.m is in octave-geometry 1.7.0-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below. 

  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
## 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} = } drawEllipse (@var{elli})
## @deftypefnx {Function File} {@var{h} = } drawEllipse (@var{xc}, @var{yc}, @var{ra}, @var{rb})
## @deftypefnx {Function File} {@var{h} = } drawEllipse (@var{xc}, @var{yc}, @var{ra}, @var{rb}, @var{theta})
## @deftypefnx {Function File} {@var{h} = } drawEllipse (@dots{}, @var{param}, @var{value})
## Draw an ellipse on the current axis.
##
##   drawEllipse(ELLI);
##   Draws the ellipse ELLI in the form [XC YC RA RB THETA], with center
##   (XC, YC), with main axis of half-length RA and RB, and orientation
##   THETA in degrees counted counter-clockwise.
##   Puts all parameters into one single array.
##
##   drawEllipse(XC, YC, RA, RB);
##   drawEllipse(XC, YC, RA, RB, THETA);
##   Specifies ellipse parameters as separate arguments (old syntax).
##
##   drawEllipse(..., NAME, VALUE);
##   Specifies drawing style of ellipse, see the help of plot function.
##
##   H = drawEllipse(...);
##   Also returns handles to the created line objects.
##
##   -> Parameters can also be arrays. In this case, all arrays are supposed 
##   to have the same size.
##
##   Example: 
##   @example
##   # Draw an ellipse centered in [50 50], with semi major axis length of
##   # 40, semi minor axis length of 20, and rotated by 30 degrees.
##     figure(1); clf; hold on;
##     drawEllipse([50 50 40 20 30]);
##     axis equal;
## @end example
##
##   @seealso{ellipses2d, drawCircle, drawEllipseArc, ellipseAsPolygon}
## @end deftypefn

function varargout = drawEllipse(varargin)

  # extract dawing style strings
  styles = {};
  for i = 1:length(varargin)
      if ischar(varargin{i})
          styles = varargin(i:end);
          varargin(i:end) = [];
          break;
      end
  end

  # extract ellipse parameters
  if length(varargin)==1
      # ellipse is given in a single array
      ellipse = varargin{1};
      x0 = ellipse(:, 1);
      y0 = ellipse(:, 2);
      a  = ellipse(:, 3);
      b  = ellipse(:, 4);
      if length(ellipse)>4
          theta = ellipse(:, 5);
      else
          theta = zeros(size(x0));
      end
      
  elseif length(varargin)>=4
      # ellipse parameters given as separate arrays
      x0 = varargin{1};
      y0 = varargin{2};
      a  = varargin{3};
      b  = varargin{4};
      if length(varargin)>4
          theta = varargin{5};
      else
          theta = zeros(size(x0));
      end
      
  else
      error('drawEllipse: incorrect input arguments');
  end


  ## Process drawing of a set of ellipses

  # angular positions of vertices
  t = linspace(0, 2*pi, 145);

  # compute position of points to draw each ellipse
  h = zeros(length(x0), 1);
  for i = 1:length(x0)
      # pre-compute rotation angles (given in degrees)
      cot = cosd(theta(i));
      sit = sind(theta(i));
      
      # compute position of points used to draw current ellipse
      xt = x0(i) + a(i) * cos(t) * cot - b(i) * sin(t) * sit;
      yt = y0(i) + a(i) * cos(t) * sit + b(i) * sin(t) * cot;
      
      # stores handle to graphic object
      h(i) = plot(xt, yt, styles{:});
  end

  # return handles if required
  if nargout > 0
      varargout = {h};
  end

endfunction

APT Browse - Built by Thomas Orozco.