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## Copyright (C) 2004 Shai Ayal
##
## This program 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 2, or (at your option)
## any later version.
##
## OctPlot 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 OctPlot; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h}} = plot(@var{args})
## This function produces two-dimensional plots. Many different
## combinations of arguments are possible. The simplest form is
##
## @example
## plot (@var{y})
## @end example
##
## @noindent where the argument is taken as the set of @var{y}
## coordinates and the
## @var{x} coordinates are taken to be the indices of the elements,
## starting with 1.
##
## If more than one argument is given, they are interpreted as
##
## @example
## plot (@var{x}, @var{y}, @var{fmt} ...)
## @end example
##
## @noindent where @var{y} and @var{fmt} are optional, and any number of
## argument
## sets may appear. The @var{x} and @var{y} values are interpreted as
## follows:
##
## @itemize @bullet
## @item If a single data argument is supplied, it is
## taken as the set of @var{y}
## coordinates and the @var{x} coordinates are taken to be the indices
## of the elements, starting with 1.
##
## @item If the first argument is a vector and the second is a matrix,the
## the vector is plotted versus the columns (or rows) of the matrix.
## (using whichever combination matches, with columns tried first.)
##
## @item If the first argument is a matrix and the second is a vector,the
## the columns (or rows) of the matrix are plotted versus the vector.
## (using whichever combination matches, with columns tried first.)
##
## @item If both arguments are vectors, the elements of @var{y} are
## plotted versus the elements of @var{x}.
##
## @item If both arguments are matrices, the columns of @var{y} are
## plotted versus the columns of @var{x}. In this case, both matrices
## must have
## the same number of rows and columns and no attempt is made to transpose
## the arguments to make the number of rows match.
##
## @item If both arguments are scalars, a single point is plotted.
## @end itemize
##
## If @var{fmt} is missing, the default line style is assumed. Line
## colors will be determined using the ColorOrder propertu of the
## current axes.
##
## If the @var{fmt} argument is supplied, it is interpreted as follows.
##
## @table @samp
##
## @item -
## Set lines line style (default).
##
## @item :
## Set dotted line style.
##
## @item --
## Set dashed line style.
##
## @item -.
## Set dash-dot line style.
##
## @item none
## Set no line style.
##
## @item ;text;
## sets the line's label to @code{text}
##
## @item @var{c}
## If @var{c} is one of @code{r}, @code{g},
## @code{b}, @code{c}, @code{m}, @code{y}, @code{k},
## or @code{w}, it is interpreted
## as the plot color (red, green, blue, cyan, magenta, yellow, black or
## white).
##
## @item @var{s}
## if @var{s} is one of @code{+}, @code{o}, @code{*}, @code{.},
## @code{x}, @code{^}, @code{v}, @code{>}, @code{<}, @code{s} or
## @code{d}, it is interepted as the marker style.
##
## @end table
##
## plot returns the handle(s) of the line(s) created
##
## Here are some plot examples:
##
## @example
## h=plot (y, "b*--;dead parrot;");
## @end example
##
## This command will plot the data in the variable @code{y} vs the index
## of @code{y}. The plot style will be blue dahsed lines with a * symbol
## and the line label will be "dead parrot". The lines handle will be
## returned in @code{h}.
## @end deftypefn
## @seealso{set,get,line}
## Author: shaia
function hout = plot (varargin)
## the current color when no color is given explicitly
persistent color_order_ptr
if(__nxtplt__())
color_order_ptr = 1;
endif
if(isempty(color_order_ptr))
color_order_ptr = 1;
endif
data_parms = 0;
format_parms = 0;
plot_it = 0;
cur_arg = 1;
p1 = [];
p2 = [];
h = [];
cur_props=[];
while(cur_arg<=nargin)
if( isstr(varargin{cur_arg}))
if (data_parms==0)
error("no data to plot");
else
format_parms++;
[cur_props,numarg] = __pltopt__(varargin(cur_arg:end));
cur_arg += numarg-1;
endif
else
if(format_parms | data_parms==2)
[color_order_ptr,newh]=__plt__(p1,p2,color_order_ptr,cur_props);
h = [h,newh];
data_parms=0;
format_parms=0;
p1=[];
p2=[];
cur_props=[];
endif
if(data_parms==0)
p2 = varargin{cur_arg};
elseif(data_parms==1)
p1 = p2;
p2 = varargin{cur_arg};
endif
data_parms++;
endif
cur_arg++;
endwhile
if (~isempty(p2))
[color_order_ptr,newh]=__plt__(p1,p2,color_order_ptr,cur_props);
h = [h,newh];
else
error("no data to plot");
endif
ca = get(h(1),'Parent');
set(ca,"xscale","linear");
set(ca,"yscale","linear");
if(nargout)
hout = h;
endif
endfunction
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