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c plshades demo, using color fill
c
c Copyright (C) 2004 Alan W. Irwin
c
c This file is part of PLplot.
c
c PLplot is free software; you can redistribute it and/or modify
c it under the terms of the GNU Library General Public License as
c published by the Free Software Foundation; either version 2 of the
c License, or (at your option) any later version.
c
c PLplot is distributed in the hope that it will be useful,
c but WITHOUT ANY WARRANTY; without even the implied warranty of
c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c GNU Library General Public License for more details.
c
c You should have received a copy of the GNU Library General Public
c License along with PLplot; if not, write to the Free Software
c Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
implicit none
include 'plplot_parameters.h'
real*8 xx, yy, argx, argy, distort, r, t
integer NLEVEL, NX, NY, PERIMETERPTS, xdim, ydim
parameter(NLEVEL = 20)
c xdim and ydim are the static dimensions of the 2D arrays while
c NX and NY are the defined area.
parameter(xdim=99, NX = 35)
parameter(ydim=100, NY = 46)
parameter(PERIMETERPTS = 100)
real*8 clevel(NLEVEL), shedge(NLEVEL+1),
& z(xdim,ydim), w(xdim,ydim), xg1(xdim), yg1(ydim),
& xg2(xdim,ydim), yg2(xdim,ydim), zmin, zmax,
& px(PERIMETERPTS), py(PERIMETERPTS)
integer fill_width, cont_color, cont_width
integer i, j
c dummy to fill argument list with something not currently used.
character*1 defined
real*8 tr(6)
common /plplot/tr
c Process command-line arguments
call plparseopts(PL_PARSE_FULL)
c Load color palettes
call plspal0('cmap0_black_on_white.pal')
call plspal1('cmap1_gray.pal',1)
c Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
call plscmap0n(3)
c Initialize plplot
call plinit()
c Set up transformation matrix
tr(1) = 2.d0/(NX-1)
tr(2) = 0.d0
tr(3) = -1.d0
tr(4) = 0.d0
tr(5) = 2.d0/(NY-1)
tr(6) = -1.d0
c Calculate the data matrices.
do i=1,NX
xx = dble(i-1-(NX/2))/dble (NX/2)
do j=1,NY
yy = dble(j-1-(NY/2))/dble (NY/2) - 1.0d0
z(i,j) = - sin(7.d0*xx) * cos(7.d0*yy) + xx*xx - yy*yy
w(i,j) = - cos(7.d0*xx) * sin(7.d0*yy) + 2.d0*xx*yy
enddo
enddo
call a2mnmx(z, NX, NY, zmin, zmax, xdim)
do i = 1, NLEVEL
clevel(i) = zmin + (zmax - zmin) * (i - 0.5d0) / dble(NLEVEL)
enddo
do i = 1, NLEVEL+1
shedge(i) = zmin + (zmax - zmin) * dble(i-1) / dble(NLEVEL)
enddo
c Build the 1-d coord arrays.
distort = 0.4d0
do i=1,NX
xx = -1.d0 + dble(i-1)*2.d0/dble(NX-1)
xg1(i) = xx + distort*cos(0.5d0*PI*xx)
enddo
do j=1,NY
yy = -1.d0 + dble(j-1)*2.d0/dble(NY-1)
yg1(j) = yy - distort*cos(0.5d0*PI*yy)
enddo
c Build the 2-d coord arrays.
do i=1,NX
xx = -1.d0 + dble(i-1)*2.d0/dble(NX-1)
argx = 0.5d0*PI*xx
do j=1,NY
yy = -1.d0 + dble(j-1)*2.d0/dble(NY-1)
argy = 0.5d0*PI*yy
xg2(i,j) = xx + distort*cos(argx)*cos(argy)
yg2(i,j) = yy - distort*cos(argx)*cos(argy)
enddo
enddo
c Plot using transform of index range to xmin, xmax, ymin, ymax
call pladv(0)
call plvpor(0.1d0, 0.9d0, 0.1d0, 0.9d0)
call plwind(-1.0d0, 1.0d0, -1.0d0, 1.0d0)
call plpsty(0)
fill_width = 2
cont_color = 0
cont_width = 0
call plshades0(z, NX, NY, defined, -1.d0, 1.d0, -1.d0, 1.d0,
& shedge, NLEVEL+1, fill_width,
& cont_color, cont_width, xdim)
call plcol0(1)
call plbox('bcnst', 0.0d0, 0, 'bcnstv', 0.0d0, 0)
call plcol0(2)
call pllab('distance', 'altitude', 'Bogon density')
c Plot using 1d coordinate transform
call plspal0('cmap0_black_on_white.pal')
call plspal1('cmap1_blue_yellow.pal',1)
call plscmap0n(3)
call pladv(0)
call plvpor(0.1d0, 0.9d0, 0.1d0, 0.9d0)
call plwind(-1.0d0, 1.0d0, -1.0d0, 1.0d0)
call plpsty(0)
fill_width = 2
cont_color = 0
cont_width = 0
call plshades1(z, NX, NY, defined, -1.d0, 1.d0, -1.d0, 1.d0,
& shedge, NLEVEL+1, fill_width,
& cont_color, cont_width, xg1, yg1, xdim)
call plcol0(1)
call plbox('bcnst', 0.0d0, 0, 'bcnstv', 0.0d0, 0)
call plcol0(2)
call pllab('distance', 'altitude', 'Bogon density')
c Plot using 2d coordinate transform
call plspal0('cmap0_black_on_white.pal')
call plspal1('cmap1_blue_red.pal',1)
call plscmap0n(3)
call pladv(0)
call plvpor(0.1d0, 0.9d0, 0.1d0, 0.9d0)
call plwind(-1.0d0, 1.0d0, -1.0d0, 1.0d0)
call plpsty(0)
fill_width = 2
cont_color = 0
cont_width = 0
call plshades2(z, NX, NY, defined, -1.d0, 1.d0, -1.d0, 1.d0,
& shedge, NLEVEL+1, fill_width,
& cont_color, cont_width, xg2, yg2, xdim)
call plcol0(1)
call plbox('bcnst', 0.0d0, 0, 'bcnstv', 0.0d0, 0)
call plcol0(2)
call plcon2(w, xdim, ny, 1, nx, 1, ny, clevel, NLEVEL, xg2, yg2)
call pllab('distance', 'altitude',
& 'Bogon density, with streamlines')
c Plot using 2d coordinate transform and plshades contours.
call plspal0('')
call plspal1('',1)
call plscmap0n(3)
call pladv(0)
call plvpor(0.1d0, 0.9d0, 0.1d0, 0.9d0)
call plwind(-1.0d0, 1.0d0, -1.0d0, 1.0d0)
call plpsty(0)
fill_width = 2
cont_color = 2
cont_width = 3
call plshades2(z, NX, NY, defined, -1.d0, 1.d0, -1.d0, 1.d0,
& shedge, NLEVEL+1, fill_width,
& cont_color, cont_width, xg2, yg2, xdim)
call plcol0(1)
call plbox('bcnst', 0.0d0, 0, 'bcnstv', 0.0d0, 0)
call plcol0(2)
call pllab('distance', 'altitude', 'Bogon density')
c Example with polar coordinates.
call plspal0('cmap0_black_on_white.pal')
call plspal1('cmap1_gray.pal',1)
call plscmap0n(3)
call pladv(0)
call plvpor(0.1d0, 0.9d0, 0.1d0, 0.9d0)
call plwind(-1.d0, 1.d0, -1.d0, 1.d0)
call plpsty(0)
c Build new coordinate matrices.
do i = 1, NX
r = dble(i-1)/dble(NX-1)
do j = 1, NY
t = (2.d0*PI/dble(NY-1))*dble(j-1)
xg2(i,j) = r*cos(t)
yg2(i,j) = r*sin(t)
z(i,j) = exp(-r*r)*cos(5.d0*PI*r)*cos(5.d0*t)
enddo
enddo
c Need a new shedge to go along with the new data set.
call a2mnmx(z, NX, NY, zmin, zmax, xdim)
do i = 1, NLEVEL+1
shedge(i) = zmin + (zmax - zmin) * dble(i-1) / dble(NLEVEL)
enddo
c Now we can shade the interior region.
fill_width = 2
cont_color = 0
cont_width = 0
call plshades2(z, NX, NY, defined, -1.d0, 1.d0, -1.d0, 1.d0,
& shedge, NLEVEL+1, fill_width,
& cont_color, cont_width, xg2, yg2, xdim)
c Now we can draw the perimeter. (If do before, shade stuff may overlap.)
do i = 1, PERIMETERPTS
t = (2.d0*PI/dble(PERIMETERPTS-1))*dble(i-1)
px(i) = cos(t)
py(i) = sin(t)
enddo
call plcol0(1)
call plline(PERIMETERPTS, px, py)
c And label the plot.
call plcol0(2)
call pllab( '', '', 'Tokamak Bogon Instability' )
call plend
end
c----------------------------------------------------------------------------
c Subroutine a2mnmx
c Minimum and the maximum elements of a 2-d array.
subroutine a2mnmx(f, nx, ny, fmin, fmax, xdim)
implicit none
integer i, j, nx, ny, xdim
real*8 f(xdim, ny), fmin, fmax
fmax = f(1, 1)
fmin = fmax
do j = 1, ny
do i = 1, nx
fmax = max(fmax, f(i, j))
fmin = min(fmin, f(i, j))
enddo
enddo
end
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