/usr/share/doc/libplplot12/examples/f95/x16af.f90 is in libplplot-dev 5.10.0+dfsg-1.
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! Demonstration of plshade plotting
! Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
!
! Copyright (C) 2004 Alan W. Irwin
!
! This file is part of PLplot.
!
! PLplot is free software; you can redistribute it and/or modify
! it under the terms of the GNU Library General Public License as
! published by the Free Software Foundation; either version 2 of the
! License, or (at your option) any later version.
!
! PLplot 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 Library General Public License for more details.
!
! You should have received a copy of the GNU Library General Public
! License along with PLplot; if not, write to the Free Software
! Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
use plplot
implicit none
! Process command-line arguments
call plparseopts(PL_PARSE_FULL)
call plscmap0n(3)
! Initialize plplot
call plinit()
! Rectangular coordinate plot
call rect()
! Polar coordinate plot
call polar()
call plend
end
! Plot function using the identity transform
subroutine rect()
use plplot
implicit none
integer xdim, ydim, NX, NY, NCONTR
! xdim and ydim are the static dimensions of the 2D arrays while
! NX and NY are the defined area.
parameter (xdim = 99, NX = 35, ydim = 100, NY = 46, NCONTR = 14)
real(kind=plflt) z(xdim, ydim), w(xdim, ydim), clevel(NCONTR)
real(kind=plflt) xmin, xmax, ymin, ymax, zmin, zmax, x, y
real(kind=plflt) shade_min, shade_max, sh_color
integer i, j, sh_cmap
integer min_color, max_color
real(kind=plflt) sh_width, min_width, max_width
xmin = -1._plflt
ymin = -1._plflt
xmax = 1._plflt
ymax = 1._plflt
! Set up for plshade call
sh_cmap = 1
min_color = 1
min_width = 0
max_color = 0
max_width = 0
! Set up data arrays
do i = 1, NX
x = (i - 1 - (NX/2)) / dble (NX/2)
do j = 1, NY
y = (j - 1 - (NY/2)) / dble (NY/2) - 1.0_plflt
z(i,j) = x*x - y*y + (x - y) / (x*x + y*y + 0.1_plflt)
w(i,j) = 2*x*y
enddo
enddo
call a2mnmx(z, NX, NY, zmin, zmax, xdim)
do i = 1, NCONTR
clevel(i) = zmin + (zmax - zmin) * (i + 0.5_plflt) / &
dble (NCONTR)
enddo
! Plot using identity transform
call pladv(0)
call plvpor(0.1_plflt, 0.9_plflt, 0.1_plflt, 0.9_plflt)
call plwind(-1.0_plflt, 1.0_plflt, -1.0_plflt, 1.0_plflt)
do i = 1, NCONTR
shade_min = zmin + (zmax - zmin) * dble (i - 1) / &
dble (NCONTR)
shade_max = zmin + (zmax - zmin) * dble (i) / &
dble (NCONTR)
sh_color = dble (i - 1) / dble (NCONTR - 1)
sh_width = 2
call plpsty(0)
call plshade(z(:NX,:NY), ' ', &
-1._plflt, 1.0_plflt, -1.0_plflt, 1.0_plflt, &
shade_min, shade_max, &
sh_cmap, sh_color, sh_width, &
min_color, min_width, max_color, max_width )
enddo
call plcol0(1)
call plbox('bcnst', 0.0_plflt, 0, 'bcnstv', 0.0_plflt, 0)
call plcol0(2)
call pllab('distance', 'altitude', 'Bogon flux')
end
! Routine for demonstrating use_ of transformation arrays in contour plots.
subroutine polar()
use plplot, TWOPI => PL_TWOPI
implicit none
integer xdim, ydim, NX, NY, NCONTR, NBDRY
! xdim and ydim are the static dimensions of the 2D arrays while
! NX and NY are the defined area.
parameter (xdim = 99, NX = 40, ydim = 100, NY = 64)
parameter (NCONTR = 14, NBDRY=200)
real(kind=plflt) z(xdim, ydim), ztmp(xdim, ydim+1)
real(kind=plflt) xg(xdim, ydim+1), yg(xdim, ydim+1), &
xtm(NBDRY), ytm(NBDRY)
real(kind=plflt) clevel(NCONTR)
real(kind=plflt) xmin, xmax, ymin, ymax, zmin, zmax
real(kind=plflt) xpmin, xpmax, ypmin, ypmax
real(kind=plflt) r, theta, rmax, x0, y0
real(kind=plflt) eps, q1, d1, q1i, d1i, q2, d2, q2i, d2i
real(kind=plflt) div1, div1i, div2, div2i
real(kind=plflt) shade_min, shade_max, sh_color
real(kind=plflt) xtick, ytick
integer nxsub, nysub
integer ncolbox, ncollab
integer i, j, kx, lx, ky, ly
integer sh_cmap
integer min_color, max_color
real(kind=plflt) sh_width, min_width, max_width
character(len=8) xopt, yopt
! Set up for plshade call
sh_cmap = 1
min_color = 1
min_width = 0
max_color = 0
max_width = 0
kx = 1
lx = NX
ky = 1
ly = NY
! Set up r-theta grids
! Tack on extra cell in theta to handle periodicity.
do i = 1, NX
r = i - 0.5_plflt
do j = 1, NY
theta = TWOPI/dble(NY) * (j-0.5_plflt)
xg(i,j) = r * cos(theta)
yg(i,j) = r * sin(theta)
enddo
xg(i, NY+1) = xg(i, 1)
yg(i, NY+1) = yg(i, 1)
enddo
call a2mnmx(xg, NX, NY, xmin, xmax, xdim)
call a2mnmx(yg, NX, NY, ymin, ymax, xdim)
rmax = r
x0 = (xmin + xmax)/2._plflt
y0 = (ymin + ymax)/2._plflt
! Potential inside a conducting cylinder (or sphere) by method of images.
! Charge 1 is placed at (d1, d1), with image charge at (d2, d2).
! Charge 2 is placed at (d1, -d1), with image charge at (d2, -d2).
! Also put in smoothing term at small distances.
eps = 2._plflt
q1 = 1._plflt
d1 = r/4._plflt
q1i = - q1*r/d1
d1i = r**2/d1
q2 = -1._plflt
d2 = r/4._plflt
q2i = - q2*r/d2
d2i = r**2/d2
do i = 1, NX
do j = 1, NY
div1 = sqrt((xg(i,j)-d1)**2 + (yg(i,j)-d1)**2 + eps**2)
div1i = sqrt((xg(i,j)-d1i)**2 + (yg(i,j)-d1i)**2 + eps**2)
div2 = sqrt((xg(i,j)-d2)**2 + (yg(i,j)+d2)**2 + eps**2)
div2i = sqrt((xg(i,j)-d2i)**2 + (yg(i,j)+d2i)**2 + eps**2)
z(i,j) = q1/div1 + q1i/div1i + q2/div2 + q2i/div2i
enddo
enddo
! Tack on extra cell in theta to handle periodicity.
do i = 1, NX
do j = 1, NY
ztmp(i,j) = z(i,j)
enddo
ztmp(i, NY+1) = z(i, 1)
enddo
call a2mnmx(z, NX, NY, zmin, zmax, xdim)
! Set up contour levels.
do i = 1, NCONTR
clevel(i) = zmin + (i-0.5_plflt)*abs(zmax - zmin)/dble(NCONTR)
enddo
! Advance graphics frame and get ready to plot.
ncolbox = 1
ncollab = 2
call pladv(0)
call plcol0(ncolbox)
! Scale window to user coordinates.
! Make a bit larger so the boundary does not get clipped.
eps = 0.05_plflt
xpmin = xmin - abs(xmin)*eps
xpmax = xmax + abs(xmax)*eps
ypmin = ymin - abs(ymin)*eps
ypmax = ymax + abs(ymax)*eps
call plvpas(0.1_plflt, 0.9_plflt, 0.1_plflt, 0.9_plflt, 1.0_plflt)
call plwind(xpmin, xpmax, ypmin, ypmax)
xopt = ' '
yopt = ' '
xtick = 0._plflt
nxsub = 0
ytick = 0._plflt
nysub = 0
call plbox(xopt, xtick, nxsub, yopt, ytick, nysub)
! Call plotter once for z < 0 (dashed), once for z > 0 (solid lines).
do i = 1, NCONTR
shade_min = zmin + (zmax - zmin) * dble (i - 1) / &
dble (NCONTR)
shade_max = zmin + (zmax - zmin) * dble (i) / &
dble (NCONTR)
sh_color = dble (i - 1) / dble (NCONTR - 1)
sh_width = 2
call plpsty(0)
call plshade(z(:NX,:NY), ' ', &
-1.0_plflt, 1.0_plflt, -1.0_plflt, 1.0_plflt, &
shade_min, shade_max, &
sh_cmap, sh_color, sh_width, &
min_color, min_width, max_color, max_width, &
xg(:NX,:NY), yg(:NX,:NY) )
enddo
! Draw boundary.
do i = 1, NBDRY
theta = (TWOPI)/(NBDRY-1) * dble(i-1)
xtm(i) = x0 + rmax * cos(theta)
ytm(i) = y0 + rmax * sin(theta)
enddo
call plcol0(ncolbox)
call plline(xtm, ytm)
call plcol0(ncollab)
call pllab(' ', ' ', &
'Shielded potential of charges in a conducting sphere')
end
!----------------------------------------------------------------------------
! Subroutine a2mnmx
! Minimum and the maximum elements of a 2-d array.
subroutine a2mnmx(f, nx, ny, fmin, fmax, xdim)
use plplot
implicit none
integer i, j, nx, ny, xdim
real(kind=plflt) 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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