--- /dev/null
+## Copyright (C) 1993-2012 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} stairs (@var{y})
+## @deftypefnx {Function File} {} stairs (@var{x}, @var{y})
+## @deftypefnx {Function File} {} stairs (@dots{}, @var{style})
+## @deftypefnx {Function File} {} stairs (@dots{}, @var{prop}, @var{val})
+## @deftypefnx {Function File} {} stairs (@var{h}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} stairs (@dots{})
+## @deftypefnx {Function File} {[@var{xstep}, @var{ystep}] =} stairs (@dots{})
+## Produce a stairstep plot. The arguments may be vectors or matrices.
+##
+## If only one argument is given, it is taken as a vector of y-values
+## and the x coordinates are taken to be the indices of the elements.
+##
+## If one output argument is requested, return a graphics handle to the plot.
+## If two output arguments are specified, the data are generated but
+## not plotted. For example,
+##
+## @example
+## stairs (x, y);
+## @end example
+##
+## @noindent
+## and
+##
+## @example
+## @group
+## [xs, ys] = stairs (x, y);
+## plot (xs, ys);
+## @end group
+## @end example
+##
+## @noindent
+## are equivalent.
+## @seealso{plot, semilogx, semilogy, loglog, polar, mesh, contour,
+## bar, xlabel, ylabel, title}
+## @end deftypefn
+
+## Author: jwe
+
+function [xs, ys] = stairs (varargin)
+
+ [ax, varargin, nargin] = __plt_get_axis_arg__ ("stairs", varargin{:});
+
+ if (nargin < 1)
+ print_usage ();
+ else
+ if (nargout > 1)
+ [h, xs, ys] = __stairs__ (false, varargin{:});
+ else
+ oldax = gca ();
+ unwind_protect
+ axes (ax);
+ newplot ();
+ [h, xxs, yys] = __stairs__ (true, varargin{:});
+ unwind_protect_cleanup
+ axes (oldax);
+ end_unwind_protect
+ endif
+ if (nargout == 1)
+ xs = h;
+ endif
+ endif
+endfunction
+
+function [h, xs, ys] = __stairs__ (doplot, varargin)
+
+ if (nargin == 2 || ischar (varargin{2}))
+ y = varargin {1};
+ varargin(1) = [];
+ if (ismatrix (y))
+ if (isvector (y))
+ y = y(:);
+ endif
+ x = 1:rows (y);
+ endif
+ else
+ x = varargin{1};
+ y = varargin{2};
+ varargin(1:2) = [];
+ endif
+
+ if (ndims (x) > 2 || ndims (y) > 2)
+ error ("stairs: expecting 2-d arguments");
+ endif
+
+ vec_x = isvector (x);
+
+ if (vec_x)
+ x = x(:);
+ endif
+
+ if (isvector (y))
+ y = y(:);
+ endif
+
+ if (ismatrix (y))
+ [nr, nc] = size (y);
+ if (vec_x)
+ x = repmat (x, [1, nc]);
+ else
+ [x_nr, x_nc] = size (x);
+ if (x_nr != nr || x_nc != nc)
+ error ("stairs: argument size mismatch");
+ endif
+ endif
+ endif
+
+ len = 2*nr - 1;
+
+ xs = ys = zeros (len, nc);
+
+ xs(1,:) = x(1,:);
+ ys(1,:) = y(1,:);
+
+ xtmp = x(2:nr,:);
+ ridx = 2:2:len-1;
+ xs(ridx,:) = xtmp;
+ ys(ridx,:) = y(1:nr-1,:);
+
+ ridx = 3:2:len;
+ xs(ridx,:) = xtmp;
+ ys(ridx,:) = y(2:nr,:);
+
+ have_line_spec = false;
+ for i = 1 : length (varargin)
+ arg = varargin {i};
+ if ((ischar (arg) || iscell (arg)) && ! have_line_spec)
+ [linespec, valid] = __pltopt__ ("stairs", arg, false);
+ if (valid)
+ have_line_spec = true;
+ varargin(i) = [];
+ break;
+ endif
+ endif
+ endfor
+
+ if (doplot)
+ h = [];
+ unwind_protect
+ hold_state = get (gca (), "nextplot");
+ for i = 1 : size(y, 2)
+ hg = hggroup ();
+ h = [h; hg];
+ args = __add_datasource__ ("stairs", hg, {"x", "y"}, varargin{:});
+
+ addproperty ("xdata", hg, "data", x(:,i).');
+ addproperty ("ydata", hg, "data", y(:,i).');
+
+ addlistener (hg, "xdata", @update_data);
+ addlistener (hg, "ydata", @update_data);
+
+ if (have_line_spec)
+ tmp = line (xs(:,i).', ys(:,i).', "color", linespec.color,
+ "parent", hg);
+ else
+ tmp = line (xs(:,i).', ys(:,i).', "color", __next_line_color__ (),
+ "parent", hg);
+ endif
+
+ addproperty ("color", hg, "linecolor", get (tmp, "color"));
+ addproperty ("linewidth", hg, "linelinewidth", get (tmp, "linewidth"));
+ addproperty ("linestyle", hg, "linelinestyle", get (tmp, "linestyle"));
+
+ addproperty ("marker", hg, "linemarker", get (tmp, "marker"));
+ addproperty ("markerfacecolor", hg, "linemarkerfacecolor",
+ get (tmp, "markerfacecolor"));
+ addproperty ("markeredgecolor", hg, "linemarkeredgecolor",
+ get (tmp, "markeredgecolor"));
+ addproperty ("markersize", hg, "linemarkersize",
+ get (tmp, "markersize"));
+
+ addlistener (hg, "color", @update_props);
+ addlistener (hg, "linewidth", @update_props);
+ addlistener (hg, "linestyle", @update_props);
+ addlistener (hg, "marker", @update_props);
+ addlistener (hg, "markerfacecolor", @update_props);
+ addlistener (hg, "markeredgecolor", @update_props);
+ addlistener (hg, "markersize", @update_props);
+
+ if (! isempty (args))
+ set (hg, args{:});
+ endif
+ endfor
+ unwind_protect_cleanup
+ set (gca (), "nextplot", hold_state);
+ end_unwind_protect
+ else
+ h = 0;
+ endif
+
+endfunction
+
+
+%!demo
+%! clf
+%! x = 1:10;
+%! rand_1x10_data1 = [0.073, 0.455, 0.837, 0.124, 0.426, 0.781, 0.004, 0.024, 0.519, 0.698];
+%! y = rand_1x10_data1;
+%! stairs (x, y);
+
+%!demo
+%! clf
+%! x = 1:10;
+%! rand_1x10_data2 = [0.014, 0.460, 0.622, 0.394, 0.531, 0.378, 0.466, 0.788, 0.342, 0.893];
+%! y = rand_1x10_data2;
+%! [xs, ys] = stairs (x, y);
+%! plot (xs, ys);
+
+%!demo
+%! clf
+%! stairs (1:9);
+
+%!demo
+%! clf
+%! [xs, ys] = stairs (9:-1:1);
+%! plot (xs, ys);
+
+
+function update_props (h, d)
+ set (get (h, "children"), "color", get (h, "color"),
+ "linewidth", get (h, "linewidth"),
+ "linestyle", get (h, "linestyle"),
+ "marker", get (h, "marker"),
+ "markerfacecolor", get (h, "markerfacecolor"),
+ "markeredgecolor", get (h, "markeredgecolor"),
+ "markersize", get (h, "markersize"));
+endfunction
+
+function update_data (h, d)
+ x = get (h, "xdata");
+ y = get (h, "ydata");
+
+ nr = length (x);
+ len = 2 * nr - 1;
+ xs = ys = zeros (1, len);
+
+ xs(1) = x(1);
+ ys(1) = y(1);
+
+ xtmp = x(2:nr);
+ ridx = 2:2:len-1;
+ xs(ridx) = xtmp;
+ ys(ridx) = y(1:nr-1);
+
+ ridx = 3:2:len;
+ xs(ridx) = xtmp;
+ ys(ridx) = y(2:nr);
+
+ set (get (h, "children"), "xdata", xs, "ydata", ys);
+endfunction
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff