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## Copyright (C) 1998-2003 Joao Cardoso.
## Copyright (C) 2004 Rafael Laboissiere
##
## 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 of the License, or (at your
## option) any later version.
##
## This program 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.
##
## This file is part of plplot_octave.
## shade(x, y, z [, levels [, contour] )
## shade(z [, levels [, contour] )
##
## plot shade of matrix z versus vectors x,y.
## level can be a scalar speficying the number of shade levels,
## or a vector, specifying where the shade level must be
## if contour exists, each shade level will be contoured with 'countour' color
function shade(x, y, z, levels, cont )
global __pl
strm = __pl_init;
old_empty_list_elements_ok = warn_empty_list_elements;
unwind_protect
warn_empty_list_elements = 0;
if (nargin == 1 && is_matrix(x))
levels = 20;
cont = 0;
z = x; y = 1:rows(z); x = 1:columns(z);
elseif (nargin == 2 && is_matrix(x))
cont = 0; levels = y;
z = x; y = 1:rows(z); x = 1:columns(z);
elseif (nargin == 3 && is_scalar(z))
levels = y; cont = z;
z = x; y = 1:rows(z); x = 1:columns(z);
elseif (nargin == 3)
levels = 20;
cont = 0;
elseif (nargin == 4)
cont = 0;
endif
if (is_scalar(levels) && levels == 1) # segmentation violation!
levels = 2;
endif
## plot color and pen width of boundary of shade region
max_color = 0; max_width = 0;
if (cont)
cont_color = cont; cont_width = 1;
else
cont_color = 0; cont_width = 0;
endif
xlen = length (x); ylen = length (y);
if (ishold == 0)
xmm = xm = min(min(x)); xM = max(max(x));
ymm = ym = min(min(y)); yM = max(max(y));
zm = min(min(z)); zM = max(max(z));
if (__pl.axis_st(strm))
xm = __pl.axis(strm,1); xM = __pl.axis(strm,2);
ix = find(x >= xm & x <= xM);
x=x(ix); z=z(:,ix);
xlen = length (x);
xmm = min(x);
if (length(__pl.axis(strm,:)) >= 4)
ym = __pl.axis(strm,3); yM = __pl.axis(strm,4);
iy = find(y >= ym & y <= yM);
y=y(iy); z=z(iy,:);
ylen = length (y);
ymm = min(y);
else
__pl.axis(strm,3) = ym; __pl.axis(strm,4) = yM;
endif
if (length(__pl.axis(strm,:)) == 6)
zm = __pl.axis(strm,5); zM = __pl.axis(strm,6);
else
__pl.axis(strm,5) = zm; __pl.axis(strm,6) = zM;
endif
else # make axis() return current axis
__pl.axis(strm,1) = xm; __pl.axis(strm,2) = xM;
__pl.axis(strm,3) = ym; __pl.axis(strm,4) = yM;
__pl.axis(strm,5) = zm; __pl.axis(strm,6) = zM;
endif
__pl.plcol(strm) = 1;
plcol(15);pllsty(1);
__pl_plenv(xm, xM, ym, yM, 0, -2);
else
if (columns(__pl.axis(strm,:)) != 6)
error("You must contour/shade plot something before entering hold mode");
endif
xmm = xm = __pl.axis(strm,1); xM = __pl.axis(strm,2);
ymm = ym = __pl.axis(strm,3); yM = __pl.axis(strm,4);
zm = __pl.axis(strm,5); zM = __pl.axis(strm,6);
z = z( find(y >= ym & y <= yM), find(x >= xm & x <= xM));
endif
maxx = max(x); maxy = max(y); minx = min(x); miny = min(y);
if (!is_scalar(levels))
n = length(levels)-1;
clevel = levels;
else
n = levels;
clevel = linspace(zm, zM, levels+1);
cclevel = linspace(zm, zM, levels);
endif
__pl.type(strm) = -2;
__pl.lab_str = "";
__pl.plcol(strm) = 1;
__pl.pllsty(strm) = 1;
__pl.lab_pos(strm) = 1;
tr = [(maxx-minx)/(xlen-1); 0; xmm; 0; (maxy-miny)/(ylen-1); ymm];
plpsty(0);
if (1) ## plshades() is slower than several calls to plshade() !? and plshades() sometimes fails ?!
for i = 1:n
plshade(z', 0, minx, maxx, miny, maxy,
clevel(i), clevel(i+1),
1, (i-1) / (n-1), 1,
cont_color, cont_width, max_color, max_width, 1, tr);
endfor
else
plshadesx(z, minx, maxx, miny, maxy,
clevel', 1, cont_color, cont_width, 1, tr);
endif
for i = 1:n
__pl.lab_str = [__pl.lab_str; sprintf("%#+.2G", cclevel(i))];
__pl.lab_col(strm,__pl.lab_pos(strm)) = __pl.plcol(strm);
__pl.lab_lsty(strm,__pl.lab_pos(strm)) = __pl.pllsty(strm);
__pl.lab_pos(strm) = __pl.lab_pos(strm) + 1;
__pl.plcol(strm) = rem(__pl.plcol(strm), 15)+1;
if (__pl.line_style(strm))
__pl.pllsty(strm) = rem(__pl.pllsty(strm), 8)+1;
endif
endfor
if (__pl.grid(strm)) # this has to be done after shading
plcol(15);
plbox("bcnsgt",0,0,"bcnsgtv",0,0)
else
plcol(15);
plbox("bcnst",0,0,"bcnstv",0,0)
endif
if (__pl.legend(strm))
__pl_draw_legend
endif
plcol(15);
pllab(tdeblank(__pl.xlabel(strm,:)), tdeblank(__pl.ylabel(strm,:)), tdeblank(__pl.tlabel(strm,:)));
plflush;
__pl.items(strm) = 1; # for now!
unwind_protect_cleanup
warn_empty_list_elements = old_empty_list_elements_ok;
end_unwind_protect
endfunction
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