/usr/share/plplot_octave/shade.m is in octave-plplot 5.13.0+dfsg-6ubuntu2.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | ## 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;
unwind_protect
old_empty_list_elements_ok = warning("query", "Octave:empty-list-elements");
warning("off","Octave:empty-list-elements");
if (nargin == 1 && ismatrix(x))
levels = 20;
cont = 0;
z = x; y = 1:rows(z); x = 1:columns(z);
elseif (nargin == 2 && ismatrix(x))
cont = 0; levels = y;
z = x; y = 1:rows(z); x = 1:columns(z);
elseif (nargin == 3 && isscalar(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 (isscalar(levels) && levels == 1) # segmentation violation!
levels = 2;
endif
if (rows(x) > 1 && columns(x) > 1 && rows(y) > 1 && columns(y) > 1)
xymat = 1;
else
xymat = 0;
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
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);
if (xymat == 0)
ix = find(x >= xm & x <= xM);
x=x(ix); z=z(:,ix);
xmm = min(x);
endif
if (length(__pl.axis(strm,:)) >= 4)
ym = __pl.axis(strm,3); yM = __pl.axis(strm,4);
if (xymat == 0)
iy = find(y >= ym & y <= yM);
y=y(iy); z=z(iy,:);
ymm = min(y);
endif
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;
plcol0(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);
if (xymat == 0)
ix = find(x >= xm & x <= xM);
iy = find(y >= ym & y <= yM);
z = z( iy, ix );
x = x( ix );
y = y( iy );
endif
endif
maxx = max(max(x)); maxy = max(max(y)); minx = min(min(x)); miny = min(min(y));
if (columns(x)>1 && rows(x) == 1)
x = x';
endif
if (columns(y)>1 && rows(y) == 1)
y = y';
endif
if (!isscalar(levels))
n = length(levels)-1;
clevel = levels;
cclevel = clevel;
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;
plpsty(0);
if (0) ## plshades() is slower than several calls to plshade() !? and plshades() sometimes fails ?!
for i = 1:n
plshade1(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, x, y);
endfor
else
if (columns(x) == 1 && columns(y) == 1)
plshades1(z', minx, maxx, miny, maxy,
clevel', 1, cont_color, cont_width, 1, x, y);
else
plshades2(z', minx, maxx, miny, maxy,
clevel', 1, cont_color, cont_width, 1, x', y');
endif
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
plcol0(15);
plbox("bcnsgt",0,0,"bcnsgtv",0,0)
else
plcol0(15);
plbox("bcnst",0,0,"bcnstv",0,0)
endif
if (__pl.legend(strm))
__pl_draw_legend;
endif
plcol0(15);
pllab(tdeblank(__pl.xlabel(strm,:)), tdeblank(__pl.ylabel(strm,:)), tdeblank(__pl.tlabel(strm,:)));
plflush;
__pl.items(strm) = 1; # for now!
unwind_protect_cleanup
warning(old_empty_list_elements_ok.state, "Octave:empty-list-elements");
end_unwind_protect
endfunction
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