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## Copyright (C) 1998, 1999, 2000 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.
## It is based on the corresponding demo function of PLplot.
## Does a series of 3-d plots for a given data set, with different
## viewing options in each plot.
1;
function cmap1_init(g)
i = [0; 1]; # left boundary, right boundary
if (g)
h = [0; 0]; # hue -- low: red (arbitrary if s=0) -- high: red (arbitrary if s=0)
l = [0.5; 1]; # lightness -- low: half-dark -- high: light
s = [0; 0]; # minimum saturation
else
h = [240; 0]; # blue -> green -> yellow -> red
l = [0.6; 0.6];
s = [0.8; 0.8];
endif
plscmap1n(256);
plscmap1l(0, i, h, l, s, zeros(2,1));
endfunction
function ix08c
global MAG_COLOR BASE_CONT SURF_CONT FACETED
# These values must be odd, for the middle
# of the index range to be an integer, and thus
# to correspond to the exact floating point centre
# of the sombrero.
XPTS=35; ## Data points in x
YPTS=45; ## Datat points in y
alt=[60.0, 40.0];
az =[30.0, -30.0];
title=["#frPLplot Example 8 - Alt=60, Az=30";
"#frPLplot Example 8 - Alt=40, Az=-30"];
## Parse and process command line arguments
## (void) plparseopts(&argc, argv, PL_PARSE_FULL);
## Initialize plplot
plinit();
rosen = 0;
dx = 2. / ( XPTS - 1 );
dy = 2. / ( YPTS - 1 );
x = -1. + dx*(0:XPTS-1);
y = -1. + dy*(0:YPTS-1);
if (rosen)
x = x * 1.5;
y = y + 0.5;
endif
[xx, yy] = meshgrid(x,y);
if (rosen)
z = (1 - xx) .^ 2 + 100 .* (yy - xx .^ 2) .^ 2;
if exist ("do_fortran_indexing")
of = do_fortran_indexing;
do_fortran_indexing = 1;
endif
z(z <= 0) = exp(-5); # make sure the minimum after applying log() is -5
if exist ("do_fortran_indexing")
do_fortran_indexing = of;
endif
z = log(z);
else
r = sqrt(xx .* xx + yy .* yy);
z = exp(-r .* r) .* cos(2.0 * pi .* r);
endif
pllightsource(1.,1.,1.);
n_col = 100;
plscmap1n(n_col);
# Set up data and arrays for plsurf3dl call below.
indexxmin = 0;
indexxmax = XPTS;
# Must be same shape as z, and a row of z.
# Parameters of ellipse that limits the data.
x0 = 0.5*(XPTS - 1);
a = 0.9*x0;
y0 = 0.5*(YPTS - 1);
b = 0.7*y0;
for i=indexxmin+1: indexxmax
square_root = sqrt(1. - min(1., (((i-1) - x0)/a)^2));
# Add 0.5 to find nearest integer and therefore preserve symmetry
# with regard to lower and upper bound of y range.
indexymin(i) = max(0, floor(0.5 + y0 - b*square_root));
# indexymax calculated with the convention that it is 1
# greater than highest valid index.
indexymax(i) = min(YPTS, 1 + floor(0.5 + y0 + b*square_root));
zlimited(indexymin(i)+1:indexymax(i),i) = z(indexymin(i)+1:indexymax(i),i);
endfor
# Force zlimited to be the correct size so that the plsurf3dl call below passes
# all dimension consistency checks. This index is outside the elliptical
# limits above so should be ignored at the C level.
zlimited(YPTS, XPTS) = 1.e300;
nlevel = 10;
zmax = max(max(z));
zmin = min(min(z));
step = (zmax-zmin)/(nlevel+1);
clevel = linspace(zmin+step, zmax-step, nlevel)';
for k=1:2
for ifshade=0:4
pladv(0);
plvpor(0.0, 1.0, 0.0, 0.9);
plwind(-1.0, 1.0, -0.9, 1.1);
plcol0(3);
plmtex("t", 1.0, 0.5, 0.5, deblank(title(k,:)));
plcol0(1);
if (rosen)
plw3d(1.0, 1.0, 1.0, -1.5, 1.5, -0.5, 1.5, zmin, zmax, alt(k), az(k));
else
plw3d(1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, zmin, zmax, alt(k), az(k));
endif
plbox3("bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 0);
plcol0(2);
switch(ifshade)
case 0
cmap1_init(1);
plsurf3d(x', y', z', 0, 0);
case 1
cmap1_init(0);
plsurf3d(x', y', z', MAG_COLOR, 0);
case 2
plsurf3d(x', y', z', MAG_COLOR + FACETED, 0);
case 3
plsurf3d(x', y', z', MAG_COLOR + SURF_CONT + BASE_CONT, clevel);
case 4
plsurf3dl(x', y', z', MAG_COLOR + SURF_CONT + BASE_CONT, clevel, indexxmin, indexymin', indexymax');
endswitch
endfor
endfor
plend1();
endfunction
ix08c
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