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## Copyright (C) 1998, 1999, 2000 Joao Cardoso.
##
## 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.
## plshade demo, using color fill.
1;
## Set up transformation function
global nx = 35; ## Default number of data points in x
global ny = 46; ## Default number of data points in y
global tr = [2/(nx-1); 0.0; -1.0; 0.0; 2/(ny-1); -1.0];
function [tx ty] = mypltr( x, y)
global tr
tx = tr(1) * x + tr(2) * y + tr(3);
ty = tr(4) * x + tr(5) * y + tr(6);
endfunction
function ix16c
global tr; global nx; global ny;
global PL_COLORBAR_LABEL_BOTTOM;
global PL_COLORBAR_SHADE;
global PL_COLORBAR_SHADE_LABEL;
## Fundamental settings. See notes[] for more info.
ns = 20; ## Default number of shade levels
notes = [
"To get smoother color variation, increase ns, nx, and ny. To get faster",
"response (especially on a serial link), decrease them. A decent but quick",
"test results from ns around 5 and nx, ny around 25."];
sh_cmap = 1;
fill_width = 2.; cont_color = 0; cont_width = 0.;
num_axes = 1;
n_axis_opts = num_axes;
axis_opts = { "bcvtm" };
values = zeros(num_axes,ns+1);
axis_ticks = zeros(1,1);
axis_subticks = zeros(1,1);
num_labels = 1;
label_opts = [ PL_COLORBAR_LABEL_BOTTOM ];
labels = { "Magnitude" };
## Parse and process command line arguments
## plMergeOpts(options, "x16c options", notes);
## plparseopts(&argc, argv, PL_PARSE_FULL);
## Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
## Load colour palettes
plspal0("cmap0_black_on_white.pal");
plspal1("cmap1_gray.pal",1);
plscmap0n(3);
## Initialize plplot
plinit();
## Set up data array
for i = 0:nx-1
x = (i - fix(nx / 2)) / fix(nx / 2);
j = 0:ny-1;
y = (j .- fix(ny / 2)) ./ fix(ny / 2) - 1.0;
z(i+1,:) = - sin(7.*x) .* cos(7.*y) .+ x*x - y.*y;
w(i+1,:) = - cos(7.*x) .* sin(7.*y) .+ 2 .* x .* y;
endfor
zmin=min(min(z));
zmax=max(max(z));
i = 0:ns-1;
clevel = (zmin .+ (zmax - zmin) .* (i + 0.5) ./ ns)';
i = 0:ns;
shedge = zmin + (zmax - zmin) * i / ns;
## Set up coordinate grids
for i = 0:nx-1
j = 0:ny-1;
[x y] = mypltr( i, j);
argx = x * pi/2;
argy = y * pi/2;
distort = 0.4;
xg1(i+1,:) = x .+ distort .* cos(argx);
yg1(i+1,:) = y .- distort .* cos(argy);
xg2(i+1,:) = x .+ distort .* cos(argx) .* cos(argy);
yg2(i+1,:) = y .- distort .* cos(argx) .* cos(argy);
endfor
xg1 = xg1(:,1);
yg1 = yg1(1,:)';
## Plot using identity transform
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
plpsty(0);
plshades(z, -1., 1., -1., 1.,
shedge', fill_width,
cont_color, cont_width,
1);
# Smaller text
plschr( 0.0, 0.75 );
# Small ticks on the vertical axis
plsmaj( 0.0, 0.5 );
plsmin( 0.0, 0.5 );
num_values(1) = ns + 1;
values(1,:) = shedge;
[colorbar_width, colorbar_height] = plcolorbar(
bitor(PL_COLORBAR_SHADE, PL_COLORBAR_SHADE_LABEL), 0,
0.005, 0.0, 0.0375, 0.875, 0, 1, 1, 0.0, 0.0,
cont_color, cont_width,
label_opts, labels, axis_opts,
axis_ticks, axis_subticks,
num_values, values );
# Reset text and tick sizes
plschr( 0.0, 1.0 );
plsmaj( 0.0, 1.0 );
plsmin( 0.0, 1.0 );
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol0(2);
## plcont(w, 1, nx, 1, ny, clevel, tr);
pllab("distance", "altitude", "Bogon density");
## Plot using 1d coordinate transform
## Load colour palettes
plspal0("cmap0_black_on_white.pal");
plspal1("cmap1_blue_yellow.pal",1);
## Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n(3);
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
plpsty(0);
plshades1(z, -1., 1., -1., 1.,
shedge', fill_width,
cont_color, cont_width,
1, xg1, yg1);
# Smaller text
plschr( 0.0, 0.75 );
# Small ticks on the vertical axis
plsmaj( 0.0, 0.5 );
plsmin( 0.0, 0.5 );
num_values(1) = ns + 1;
values(1,:) = shedge;
[colorbar_width, colorbar_height] = plcolorbar(
bitor(PL_COLORBAR_SHADE, PL_COLORBAR_SHADE_LABEL), 0,
0.005, 0.0, 0.0375, 0.875, 0, 1, 1, 0.0, 0.0,
cont_color, cont_width,
label_opts, labels, axis_opts,
axis_ticks, axis_subticks,
num_values, values );
# Reset text and tick sizes
plschr( 0.0, 1.0 );
plsmaj( 0.0, 1.0 );
plsmin( 0.0, 1.0 );
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol0(2);
## plcont1(w, 1, nx, 1, ny, clevel, xg1, yg1);
pllab("distance", "altitude", "Bogon density");
## Plot using 2d coordinate transform
## Load colour palettes
plspal0("cmap0_black_on_white.pal");
plspal1("cmap1_blue_red.pal",1);
## Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n(3);
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
plpsty(0);
plshades2(z, -1., 1., -1., 1.,
shedge', fill_width,
cont_color, cont_width,
0, xg2, yg2);
# Smaller text
plschr( 0.0, 0.75 );
# Small ticks on the vertical axis
plsmaj( 0.0, 0.5 );
plsmin( 0.0, 0.5 );
num_values(1) = ns + 1;
values(1,:) = shedge;
[colorbar_width, colorbar_height] = plcolorbar(
bitor(PL_COLORBAR_SHADE, PL_COLORBAR_SHADE_LABEL), 0,
0.005, 0.0, 0.0375, 0.875, 0, 1, 1, 0.0, 0.0,
cont_color, cont_width,
label_opts, labels, axis_opts,
axis_ticks, axis_subticks,
num_values, values );
# Reset text and tick sizes
plschr( 0.0, 1.0 );
plsmaj( 0.0, 1.0 );
plsmin( 0.0, 1.0 );
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol0(2);
plcont2(w, 1, nx, 1, ny, clevel, xg2, yg2);
pllab("distance", "altitude", "Bogon density, with streamlines");
## Plot using 2d coordinate transform
## Load colour palettes
plspal0("");
plspal1("",1);
## Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n(3);
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
plpsty(0);
plshades2(z, -1., 1., -1., 1.,
shedge', fill_width,
2, 3.,
0, xg2, yg2);
# Smaller text
plschr( 0.0, 0.75 );
# Small ticks on the vertical axis
plsmaj( 0.0, 0.5 );
plsmin( 0.0, 0.5 );
num_values(1) = ns + 1;
values(1,:) = shedge;
[colorbar_width, colorbar_height] = plcolorbar(
bitor(PL_COLORBAR_SHADE, PL_COLORBAR_SHADE_LABEL), 0,
0.005, 0.0, 0.0375, 0.875, 0, 1, 1, 0.0, 0.0,
2, 3,
label_opts, labels, axis_opts,
axis_ticks, axis_subticks,
num_values, values );
# Reset text and tick sizes
plschr( 0.0, 1.0 );
plsmaj( 0.0, 1.0 );
plsmin( 0.0, 1.0 );
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
plcol0(2);
## plcont2(w, 1, nx, 1, ny, clevel, xg2, yg2);
pllab("distance", "altitude", "Bogon density");
## Note this exclusion API will probably change.
## Plot using 2d coordinate transform and exclusion
if (0) ## exclusion not implemented
## Load colour palettes
plspal0("cmap0_black_on_white.pal");
plspal1("cmap1_gray.pal",1);
## Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n(3);
pladv(0);
plvpor(0.1, 0.9, 0.1, 0.9);
plwind(-1.0, 1.0, -1.0, 1.0);
plpsty(0);
plshades2(z, -1., 1., -1., 1.,
shedge', fill_width,
cont_color, cont_width,
0, xg2, yg2);
plcol0(1);
plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
pllab("distance", "altitude", "Bogon density with exclusion");
endif
### Example with polar coordinates.
PERIMETERPTS=100;
## Load colour palettes
plspal0("cmap0_black_on_white.pal");
plspal1("cmap1_gray.pal",1);
## Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n(3);
pladv(0);
plvpor( .1, .9, .1, .9 );
plwind( -1., 1., -1., 1. );
plpsty(0);
## Build new coordinate matrices.
for i = 0:nx-1;
r = i/ (nx-1);
j = 0:ny-1;
t = (2*pi/(ny-1))*j;
xg2(i+1,:) = r.*cos(t);
yg2(i+1,:) = r.*sin(t);
z(i+1,:) = exp(-r.*r).*cos(5*pi*r).*cos(5*t);
endfor
## Need a new shedge to go along with the new data set.
zmin = min(min(z));
zmax = max(max(z));
i = 0:ns;
shedge = zmin + (zmax - zmin) * i / ns;
## Now we can shade the interior region.
plshades2(z, -1, 1, -1, 1,
shedge', fill_width,
cont_color, cont_width,
0, xg2, yg2);
# Smaller text
plschr( 0.0, 0.75 );
# Small ticks on the vertical axis
plsmaj( 0.0, 0.5 );
plsmin( 0.0, 0.5 );
num_values(1) = ns + 1;
values(1,:) = shedge;
[colorbar_width, colorbar_height] = plcolorbar(
bitor(PL_COLORBAR_SHADE, PL_COLORBAR_SHADE_LABEL), 0,
0.005, 0.0, 0.0375, 0.875, 0, 1, 1, 0.0, 0.0,
cont_color, cont_width,
label_opts, labels, axis_opts,
axis_ticks, axis_subticks,
num_values, values );
# Reset text and tick sizes
plschr( 0.0, 1.0 );
plsmaj( 0.0, 1.0 );
plsmin( 0.0, 1.0 );
## Now we can draw the perimeter. (If do before, shade stuff may overlap.)
i = 0:PERIMETERPTS-1;
t = (2*pi/(PERIMETERPTS-1))*i;
px = cos(t);
py = sin(t);
plcol0(1);
plline(px', py');
## And label the plot.
plcol0(2);
pllab( "", "", "Tokamak Bogon Instability" );
## Clean up
plend1();
endfunction
ix16c
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