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## Copyright (C) 1996 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 2, 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.
## usage: subplot (rows, columns, index)
## subplot (rcn)
##
## Sets plot in multiplot mode and plots in location
## given by index (there are columns X rows subwindows)
##
## Input:
##
## rows : number of rows in subplot grid
## columns: number of columns in subplot grid
## index : index of subplot where to make the next plot
##
## If only one arg, then it (crn) has to be three digit value
## specifying the location in digit 1 (rows) and 2 (columns) and digit
## 3 is the plot index
##
## The plot index runs row-wise,i.e., first all the columns in a row
## are filled and then the next row is filled
##
## For example, plot with 4 X 2 grid, will have plot indices running as
## follows:
##
## -----------------------------------
## | | | | |
## | 1 | 2 | 3 | 4 |
## | | | | |
## -----------------------------------
## | | | | |
## | 5 | 6 | 7 | 8 |
## | | | | |
## -----------------------------------
##
## Author: Vinayak Dutt <Dutt.Vinayak@mayo.EDU>
## Adapted-By: jwe
## Modified: jc
function subplot (rows, columns, index)
global __pl
strm = __pl_init;
if (nargin != 3 && nargin != 1)
usage ("subplot (rows, columns, index) or subplot (rcn)");
endif
if (nargin == 1)
if (! (isscalar (rows) && rows >= 0))
error ("subplot: input rcn has to be a positive scalar");
endif
tmp = rows;
index = rem (tmp, 10);
tmp = (tmp - index) / 10;
columns = rem (tmp, 10);
tmp = (tmp - columns) / 10;
rows = rem (tmp, 10);
elseif (! (isscalar (columns) && isscalar (rows) && isscalar (index)))
error ("subplot: columns, rows, and index have to be scalars");
endif
columns = round (columns);
rows = round (rows);
index = round (index);
if (index > columns*rows)
error ("subplot: index must be less than columns*rows");
endif
if (columns < 1 || rows < 1 || index < 1)
error ("subplot: columns,rows,index must be be positive");
endif
if (columns*rows == 1) # switching to single plot
plssub(1,1);
else
## already in multiplot with same characteristics ?
__pl.multi_cur(strm) = index;
if (__pl.multi(strm) == 1 &&
__pl.multi_col(strm) == columns &&
__pl.multi_row(strm) == rows)
pladv(index);
plvpor(0,1,0,1)
plwind(0,1,0,1)
plcol0(0); plpsty(0)
plfill([0; 1; 1; 0],[0; 0; 1; 1]);
plflush; pleop;
else
__pl.multi_col(strm) = columns;
__pl.multi_row(strm) = rows;
__pl.multi(strm) = 1;
plssub(columns, rows);
pladv(index);
endif
endif
endfunction
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