/usr/share/doc/libplplot11/examples/octave/x15c.m is in octave-plplot 5.9.9-2ubuntu2.
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## Copyright (C) 2004 Rafael Laboissiere
## Copyright (C) 2008 Andrew Ross
##
## 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.
## It is based on the corresponding demo function of PLplot.
## Does a variety of shade plots.
1;
function ix15c
XPTS= 35; ## Data points in x */
YPTS= 46; ## Datat points in y */
global tr = [2/(XPTS-1); 0.0; -1.0; 0.0; 2/(YPTS-1); -1.0];
## Parse and process command line arguments */
## (void) plparseopts(&argc, argv, PL_PARSE_FULL);
## Set up color map 0 */
## plscmap0n(3);
## Set up color map 1 */
cmap1_init2();
## Initialize plplot */
plinit();
## Set up data array */
for i = 0:XPTS-1;
xx = (i - fix(XPTS / 2)) / fix(XPTS / 2);
for j = 0:YPTS-1;
yy = (j - fix(YPTS / 2)) / fix(YPTS / 2) - 1.0;
z(i+1,j+1) = xx*xx - yy*yy + (xx - yy)/(xx*xx+yy*yy + 0.1);
endfor
endfor
zmin=min(min(z));
zmax=max(max(z));
plot1(z,zmin,zmax);
plot2(z,zmin,zmax);
plot3();
plend1();
endfunction
## Initializes color map 1 in HLS space.
function cmap1_init1
i(1) = 0; ### left boundary */
i(2) = 0.45; ### just before center */
i(3) = 0.55; ### just after center */
i(4) = 1; ### right boundary */
h(1) = 260; ### hue -- low: blue-violet */
h(2) = 260; ### only change as we go over vertex */
h(3) = 20; ### hue -- high: red */
h(4) = 20; ### keep fixed */
#if 1
l(1) = 0.5; ### lightness -- low */
l(2) = 0.0; ### lightness -- center */
l(3) = 0.0; ### lightness -- center */
l(4) = 0.5; ### lightness -- high */
#else
plscolbg(255,255,255);
l(1) = 0.5; ### lightness -- low */
l(2) = 1.0; ### lightness -- center */
l(3) = 1.0; ### lightness -- center */
l(4) = 0.5; ### lightness -- high */
#endif
s(1) = 1; ### maximum saturation */
s(2) = 1; ### maximum saturation */
s(3) = 1; ### maximum saturation */
s(4) = 1; ### maximum saturation */
plscmap1l(0, i', h', l', s', zeros(4,1));
endfunction
### Initializes color map 1 in HLS space.
function cmap1_init2()
i(1) = 0; ### left boundary */
i(2) = 0.45; ### just before center */
i(3) = 0.55; ### just after center */
i(4) = 1; ### right boundary */
h(1) = 260; ### hue -- low: blue-violet */
h(2) = 260; ### only change as we go over vertex */
h(3) = 20; ### hue -- high: red */
h(4) = 20; ### keep fixed */
if 1
l(1) = 0.6; ### lightness -- low */
l(2) = 0.0; ### lightness -- center */
l(3) = 0.0; ### lightness -- center */
l(4) = 0.6; ### lightness -- high */
else
plscolbg(255,255,255);
l(1) = 0.5; ### lightness -- low */
l(2) = 1.0; ### lightness -- center */
l(3) = 1.0; ### lightness -- center */
l(4) = 0.5; ### lightness -- high */
endif
s(1) = 1; ### saturation -- low */
s(2) = 0.5; ### saturation -- center */
s(3) = 0.5; ### saturation -- center */
s(4) = 1; ### saturation -- high */
plscmap1l(0, i', h', l', s', [ 0 0 0 0]');
endfunction
### Illustrates a single shaded region.
function plot1(z,zmin,zmax)
global tr
sh_cmap = 0;
min_color = 0; min_width = 0; max_color = 0; max_width = 0;
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
### Plot using identity transform */
shade_min = zmin + (zmax-zmin)*0.4;
shade_max = zmin + (zmax-zmin)*0.6;
sh_color = 7;
sh_width = 2;
min_color = 9;
max_color = 2;
min_width = 2;
max_width = 2;
plpsty(8);
plshade(z, 0, -1., 1., -1., 1.,
shade_min, shade_max,
sh_cmap, sh_color, sh_width,
min_color, min_width, max_color, max_width, 1, tr);
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol0(2);
pllab("distance", "altitude", "Bogon flux");
endfunction
### Illustrates multiple adjacent shaded regions, using different fill
function plot2(z,zmin,zmax)
global tr
sh_cmap = 0;
min_color = 0; min_width = 0; max_color = 0; max_width = 0;
nlin = [1, 1, 1, 1, 1, 2, 2, 2, 2, 2];
inc = [450, 0; -450, 0; 0, 0; 900, 0; 300, 0;
450,-450; 0, 900; 0, 450; 450, -450; 0, 900];
del = [2000, 2000; 2000, 2000; 2000, 2000; 2000, 2000; 2000, 2000;
2000, 2000; 2000, 2000; 2000, 2000; 4000, 4000; 4000, 2000 ];
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
## Plot using identity transform */
for i = 0:9
shade_min = zmin + (zmax - zmin) * i / 10.0;
shade_max = zmin + (zmax - zmin) * (i +1) / 10.0;
sh_color = i+6;
sh_width = 2;
n = nlin(i+1);
plpat(inc(i+1,1:n)',del(i+1,1:n)');
plshade(z, 0, -1., 1., -1., 1.,
shade_min, shade_max,
sh_cmap, sh_color, sh_width,
min_color, min_width, max_color, max_width,1,tr);
endfor
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol0(2);
pllab("distance", "altitude", "Bogon flux");
endfunction
## Illustrates shaded regions in 3d, using a different fill pattern for
## each region.
function plot3
xx = [ -1.0, 1.0, 1.0, -1.0, -1.0;
-1.0, 1.0, 1.0, -1.0, -1.0 ];
yy = [ 1.0, 1.0, 0.0, 0.0, 1.0;
-1.0, -1.0, 0.0, 0.0, -1.0 ];
zz = [ 0.0, 0.0, 1.0, 1.0, 0.0;
0.0, 0.0, 1.0, 1.0, 0.0 ];
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
plw3d(1., 1., 1., -1.0, 1.0, -1.0, 1.0, 0.0, 1.5, 30, -40);
## Plot using identity transform
plcol0(1);
plbox3("bntu", "X", 0.0, 0, "bntu", "Y", 0.0, 0, "bcdfntu", "Z", 0.5, 0);
plcol0(2);
pllab("","","3-d polygon filling");
plcol0(3);
plpsty(1);
plline3(xx(1,:)', yy(1,:)', zz(1,:)');
plfill3(xx(1,1:4)', yy(1,1:4)', zz(1,1:4)');
plpsty(2);
plline3(xx(2,:)', yy(2,:)', zz(2,:)');
plfill3(xx(2,1:4)', yy(2,1:4)', zz(2,1:4)');
endfunction
ix15c
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