/usr/share/doc/libplplot11/examples/f95/x11f.f90 is in libplplot-dev 5.9.9-2ubuntu2.
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! Mesh plot demo
!
! 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, PI => PL_PI
implicit none
integer i, j, k, ifshade, xpts, ypts
parameter (xpts=35, ypts=46)
real(kind=plflt) x(xpts), y(ypts), z(xpts,ypts), xx, yy, r
character*80 title(2)
real(kind=plflt) alt(2),az(2)
integer opt(2)
data alt /33.0_plflt,17.0_plflt/
data az /24.0_plflt,115.0_plflt/
! DRAW_LINEXY
data opt /2*3/
data title /'#frPLplot Example 11 - Alt=33, Az=24, Opt=3', &
'#frPLplot Example 11 - Alt=17, Az=115, Opt=3'/
integer nlevel
parameter (nlevel = 10)
real(kind=plflt) zmin, zmax, step, clevel(nlevel)
! Process command-line arguments
call plparseopts(PL_PARSE_FULL)
do i = 1,xpts
x(i) = 3._plflt*dble(i-1-(xpts/2))/dble (xpts/2)
enddo
do j = 1,ypts
y(j) = 3._plflt*dble(j-1-(ypts/2))/dble (ypts/2)
enddo
do i=1,xpts
xx = x(i)
do j=1,ypts
yy = y(j)
z(i,j) = 3._plflt * (1._plflt-xx)*(1._plflt-xx) * &
exp(-(xx*xx) - (yy+1._plflt)*(yy+1._plflt)) - &
10._plflt * (xx/5._plflt - xx**3 - yy**5) * exp(-xx*xx-yy*yy) - &
1._plflt/3._plflt * exp(-(xx+1._plflt)*(xx+1._plflt) - (yy*yy))
if(.false.) then
! Jungfraujoch/Interlaken
if(z(i,j).lt.-1._plflt) z(i,j) = -1._plflt
endif
enddo
enddo
call a2mnmx(z, xpts, ypts, zmin, zmax)
step = (zmax-zmin)/(nlevel+1)
do i = 1, nlevel
clevel(i) = zmin + step*i
enddo
call plinit()
call cmap1_init(0)
do k=1,2
do ifshade = 0, 3
call pladv(0)
call plcol0(1)
call plvpor(0.0_plflt, 1.0_plflt, 0.0_plflt, 0.9_plflt )
call plwind(-1.0_plflt, 1.0_plflt, -1.0_plflt, 1.5_plflt )
call plw3d(1.0_plflt, 1.0_plflt, 1.2_plflt, -3.0_plflt, &
3.0_plflt, -3.0_plflt, 3.0_plflt, zmin, zmax, alt(k),az(k))
call plbox3('bnstu','x axis', 0.0_plflt, 0, &
'bnstu', 'y axis', 0.0_plflt, 0, &
'bcdmnstuv','z axis', 0.0_plflt, 0)
call plcol0(2)
if(ifshade.eq.0) then
! wireframe plot
call plmesh(x(:xpts), y(:ypts), z(:xpts,:ypts), &
opt(k))
elseif(ifshade.eq.1) then
! magnitude colored wireframe plot
call plmesh(x(:xpts), y(:ypts), z(:xpts,:ypts), &
ior(opt(k), MAG_COLOR))
elseif(ifshade.eq.2) then
! magnitude colored wireframe plot with sides
call plot3d(x(:xpts), y(:ypts), z(:xpts,:ypts), &
ior(opt(k), MAG_COLOR), .true.)
elseif(ifshade.eq.3) then
! magnitude colored wireframe plot with base contour
call plmeshc(x(:xpts), y(:ypts), z(:xpts,:ypts), &
ior(opt(k), ior(MAG_COLOR, BASE_CONT)), clevel)
else
stop 'x11f: bad logic'
endif
call plcol0(3)
call plmtex('t', 1.0_plflt, 0.5_plflt, 0.5_plflt, title(k))
enddo
enddo
call plend
end
!----------------------------------------------------------------------------
subroutine cmap1_init(gray)
! For gray.eq.1, basic grayscale variation from half-dark
! to light. Otherwise, hue variations around the front of the
! colour wheel from blue to green to red with constant lightness
! and saturation.
use plplot
implicit none
integer gray
real(kind=plflt) i(0:1), h(0:1), l(0:1), s(0:1)
! left boundary
i(0) = 0._plflt
! right boundary
i(1) = 1._plflt
if (gray.eq.1) then
! hue -- low: red (arbitrary if s=0)
h(0) = 0.0_plflt
! hue -- high: red (arbitrary if s=0)
h(1) = 0.0_plflt
! lightness -- low: half-dark
l(0) = 0.5_plflt
! lightness -- high: light
l(1) = 1.0_plflt
! minimum saturation
s(0) = 0.0_plflt
! minimum saturation
s(1) = 0.0_plflt
else
! This combination of hues ranges from blue to cyan to green to yellow
! to red (front of colour wheel) with constant lightness = 0.6
! and saturation = 0.8.
! hue -- low: blue
h(0) = 240._plflt
! hue -- high: red
h(1) = 0.0_plflt
! lightness -- low:
l(0) = 0.6_plflt
! lightness -- high:
l(1) = 0.6_plflt
! saturation
s(0) = 0.8_plflt
! minimum saturation
s(1) = 0.8_plflt
endif
call plscmap1n(256)
call plscmap1l(.false., i, h, l, s)
end
!----------------------------------------------------------------------------
! Subroutine a2mnmx
! Minimum and the maximum elements of a 2-d array.
subroutine a2mnmx(f, nx, ny, fmin, fmax)
use plplot
implicit none
integer i, j, nx, ny
real(kind=plflt) f(nx, 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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