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|
! Copyright (C) 2004-2016 Alan W. Irwin
! Copyright (C) 2008 Andrew Ross
!
!
! 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
!
! N.B. the pl_test_flt parameter used in this code is only
! provided by the plplot module to allow convenient developer
! testing of either kind(1.0) or kind(1.0d0) floating-point
! precision regardless of the floating-point precision of the
! PLplot C libraries. We do not guarantee the value of this test
! parameter so it should not be used by users, and instead user
! code should replace the pl_test_flt parameter by whatever
! kind(1.0) or kind(1.0d0) precision is most convenient for them.
! For further details on floating-point precision issues please
! consult README_precision in this directory.
!
!
! plimage demo
!
!
!static PLOptionTable options[] = {
!{
! "dbg", /* extra debugging plot */
! NULL,
! NULL,
! &dbg,
! PL_OPT_BOOL,
! "-dbg",
! "Extra debugging plot" },
!{
! "nosombrero", /* Turns on test of xor function */
! NULL,
! NULL,
! &nosombrero,
! PL_OPT_BOOL,
! "-nosombrero",
! "No sombrero plot" },
!{
! "nointeractive", /* Turns on test of xor function */
! NULL,
! NULL,
! &nointeractive,
! PL_OPT_BOOL,
! "-nointeractive",
! "No interactive selection" },
!{
! "save", /* For saving in postscript */
! NULL,
! NULL,
! &f_name,
! PL_OPT_STRING,
! "-save filename",
! "Save sombrero plot in color postscript `filename'" },
!{
! NULL, /* option */
! NULL, /* handler */
! NULL, /* client data */
! NULL, /* address of variable to set */
! 0, /* mode flag */
! NULL, /* short syntax */
! NULL } /* long syntax */
!};
program x20f
use plplot, double_PI => PL_PI
use iso_c_binding, only: c_ptr, c_loc, c_f_pointer
implicit none
real(kind=pl_test_flt), parameter :: PI = double_PI
integer, parameter :: XDIM = 260, YDIM = 220
real(kind=pl_test_flt), parameter :: XDIMR = XDIM, YDIMR = YDIM
real(kind=pl_test_flt) :: x(XDIM), y(YDIM), z(XDIM,YDIM), r(XDIM,YDIM)
real(kind=pl_test_flt) :: xi, yi, xe, ye
integer i, j
real(kind=pl_test_flt) width_r, height_r
!
! Dimensions taken from "Chloe.pgm"
!
integer width, height, num_col
integer :: plparseopts_rc
real(kind=pl_test_flt), dimension(:,:), pointer :: img_f
real(kind=pl_test_flt), dimension(:,:), pointer :: xg, yg
real(kind=pl_test_flt), dimension(:), pointer :: xg1, yg1
real(kind=pl_test_flt) :: img_max, img_min
real(kind=pl_test_flt) :: x0, y0, dy, stretch
!
! Parameters from command-line
!
logical dbg
logical nosombrero
logical nointeractive
character(len=80) f_name
integer :: plgetcursor_rc
real(kind=pl_test_flt) tr(6)
! Global parameters to be used in mypltr callback
real(kind=pl_test_flt) :: xmin, xmax, ymin, ymax
! Use no callback?
logical, parameter :: no_callback = .false.
! Use tr callback? (Only meaningful if no_callback is false.)
logical, parameter :: tr_callback = .false.
! Use Fortran callback with no data? (Only meaningful
! if no_callback and tr_callback are both .false.).
logical, parameter :: mypltr_callback = .false.
type mypltr_data_type
! Only contains data required by the mypltr_data callback
integer :: xpts_data, ypts_data
real(kind=pl_test_flt) :: xmin_data, xmax_data, ymin_data, ymax_data
end type mypltr_data_type
! Global data type to be used in mypltr_data callback
type(mypltr_data_type), target :: data
! Parse and process command line arguments
!
! call plMergeOpts(options, 'x20c options', NULL)
dbg = .false.
nosombrero = .false.
nointeractive = .false.
f_name = ' '
plparseopts_rc = plparseopts(PL_PARSE_FULL)
if(plparseopts_rc .ne. 0) stop "plparseopts error"
! Initialize plplot
call plinit
! View image border pixels
if (dbg) then
call plenv(1._pl_test_flt, XDIMR, 1._pl_test_flt, YDIMR, 1, 1)
z = 0.0_pl_test_flt
! Build a one pixel square border, for diagnostics
do i = 1,XDIM
! Right
z(i,YDIM) = 1._pl_test_flt
! Left
z(i,1) = 1._pl_test_flt
enddo
do i = 1,YDIM
! Top
z(1,i) = 1._pl_test_flt
! Bottom
z(XDIM,i) = 1._pl_test_flt
enddo
call pllab('...around a blue square.',' '//PL_END_OF_STRING, &
'A red border should appear...')
call plimage(z, 1._pl_test_flt, XDIMR, 1._pl_test_flt, YDIMR, 0._pl_test_flt, 0._pl_test_flt, &
1._pl_test_flt, XDIMR, 1._pl_test_flt, YDIMR)
endif
! Sombrero-like demo
if (.not. nosombrero) then
! draw a yellow plot box, useful for diagnostics! :(
call plcol0(2)
call plenv(0._pl_test_flt, 2._pl_test_flt*PI, 0.0_pl_test_flt, 3._pl_test_flt*PI, 1, -1)
do i=1,XDIM
x(i) = real(i-1,kind=pl_test_flt)*2._pl_test_flt*PI/real(XDIM-1,kind=pl_test_flt)
enddo
do i=1,YDIM
y(i) = real(i-1,kind=pl_test_flt)*3._pl_test_flt*PI/real(YDIM-1,kind=pl_test_flt)
enddo
do i=1,XDIM
do j=1,YDIM
r(i,j) = sqrt(x(i)*x(i)+y(j)*y(j))+0.001_pl_test_flt
z(i,j) = sin(r(i,j)) / (r(i,j))
enddo
enddo
call pllab('No, an amplitude clipped "sombrero"', '', &
'Saturn?')
call plptex(2._pl_test_flt, 2._pl_test_flt, 3._pl_test_flt, 4._pl_test_flt, 0._pl_test_flt, 'Transparent image')
call plimage(z, 0._pl_test_flt, 2._pl_test_flt*PI, 0.0_pl_test_flt, 3._pl_test_flt*PI, &
0.05_pl_test_flt, 1._pl_test_flt, 0._pl_test_flt, 2._pl_test_flt*PI, 0._pl_test_flt, 3._pl_test_flt*PI)
! Save the plot
if (f_name .ne. ' ') then
call save_plot(f_name)
endif
endif
!
! Read Chloe image
! Note we try two different locations to cover the case where this
! example is being run from the test_c.sh script
!
if (.not. read_img('Chloe.pgm', img_f, width, height, num_col)) then
if (.not. read_img('../Chloe.pgm', img_f, width, height, num_col)) then
!C call plabort('No such file')
write(*,*) 'Image could not be read'
call plend()
stop
endif
endif
width_r = real(width,kind=pl_test_flt)
height_r = real(height,kind=pl_test_flt)
! Initialize callback data
xmin = 0.0_pl_test_flt
xmax = width_r
ymin = 0.0_pl_test_flt
ymax = height_r
data%xpts_data = width
data%ypts_data = height
data%xmin_data = xmin
data%xmax_data = xmax
data%ymin_data = ymin
data%ymax_data = ymax
tr = (/ (xmax-xmin)/real(width-1,kind=pl_test_flt), 0.0_pl_test_flt, xmin, &
0.0_pl_test_flt, (ymax-ymin)/real(height-1,kind=pl_test_flt), ymin /)
! Set gray colormap
call gray_cmap(num_col)
! Display Chloe
call plenv(1._pl_test_flt, width_r, 1._pl_test_flt, height_r, 1, -1)
if (.not. nointeractive) then
call pllab('Set and drag Button 1 to (re)set selection, Butto'// &
'n 2 to finish.',' '//PL_END_OF_STRING,'Chloe...')
else
call pllab('',' '//PL_END_OF_STRING,'Chloe...')
endif
call plimage(img_f, 1._pl_test_flt, width_r, 1._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, 1._pl_test_flt, width_r, 1._pl_test_flt, height_r)
! Selection/expansion demo
if (.not. nointeractive) then
xi = 25.0_pl_test_flt
xe = 130.0_pl_test_flt
yi = 235.0_pl_test_flt
ye = 125.0_pl_test_flt
if (get_clip(xi, xe, yi, ye)) then
call plend()
stop
endif
!
! I'm unable to continue, clearing the plot and advancing to the next
! one, without hiting the enter key, or pressing the button... help!
! Forcing the xwin driver to leave locate mode and destroying the
! xhairs (in GetCursorCmd()) solves some problems, but I still have
! to press the enter key or press Button-2 to go to next plot, even
! if a pladv() is not present! Using plbop() solves the problem, but
! it shouldn't be needed!
!
! plspause(0), pladv(0), plspause(1), also works,
! but the above question remains.
! With this approach, the previous pause state is lost,
! as there is no API call to get its current state.
!
call plspause(.false.)
call pladv(0)
! Display selection only
call plimage(img_f, 1._pl_test_flt, width_r, 1._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, xi, xe, ye, yi)
call plspause(.true.)
! Zoom in selection
call plenv(xi, xe, ye, yi, 1, -1)
call plimage(img_f, 1._pl_test_flt, width_r, 1._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, xi, xe, ye, yi)
endif
! Base the dynamic range on the image contents.
call a2mnmx(img_f,width,height,img_min,img_max,width)
call plcol0(2)
call plenv(0._pl_test_flt, width_r, 0._pl_test_flt, height_r, 1, -1)
call pllab("", "", "Reduced dynamic range image example")
if(no_callback) then
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min + img_max * 0.25_pl_test_flt, &
img_max - img_max * 0.25_pl_test_flt)
elseif(tr_callback) then
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min + img_max * 0.25_pl_test_flt, &
img_max - img_max * 0.25_pl_test_flt, tr)
elseif(mypltr_callback) then
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min + img_max * 0.25_pl_test_flt, &
img_max - img_max * 0.25_pl_test_flt, mypltr)
else
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min + img_max * 0.25_pl_test_flt, &
img_max - img_max * 0.25_pl_test_flt, mypltr_data, c_loc(data))
endif
! Draw a distorted version of the original image, showing its
! full dynamic range.
call plenv(0._pl_test_flt, width_r, 0._pl_test_flt, height_r, 1, -1)
call pllab("", "", "Distorted image example")
! Populate the 2-d grids used for the distortion
! NB grids must be 1 larger in each dimension than the image
! since the coordinates are for the corner of each pixel.
allocate( xg(width+1,height+1) )
allocate( yg(width+1,height+1) )
x0 = 0.5_pl_test_flt*width_r
y0 = 0.5_pl_test_flt*height_r
dy = 0.5_pl_test_flt*height_r
stretch = 0.5_pl_test_flt
do i=1,width+1
do j=1,height+1
xg(i,j) = x0 + (x0-real(i-1,kind=pl_test_flt))*(1.0_pl_test_flt - stretch* &
cos((real(j-1,kind=pl_test_flt)-y0)/dy*PI*0.5_pl_test_flt))
yg(i,j) = real(j-1,kind=pl_test_flt)
enddo
enddo
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min, img_max, xg, yg)
if(.false.) then
! Two test pages to compare undistorted results plotted with
! doubly dimensioned xg, yg, versus singly dimensioned xg1, yg1
call plenv(0._pl_test_flt, width_r, 0._pl_test_flt, height_r, 1, -1)
call pllab("", "", "Undistorted image example")
do i=1,width+1
do j=1,height+1
xg(i,j) = real(i-1,kind=pl_test_flt)
yg(i,j) = real(j-1,kind=pl_test_flt)
enddo
enddo
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min, img_max, xg, yg)
call plenv(0._pl_test_flt, width_r, 0._pl_test_flt, height_r, 1, -1)
call pllab("", "", "Undistorted image example")
allocate( xg1(width+1) )
allocate( yg1(height+1) )
do i=1,width+1
xg1(i) = real(i-1,kind=pl_test_flt)
enddo
do j=1,height+1
yg1(j) = real(j-1,kind=pl_test_flt)
enddo
call plimagefr(img_f, 0._pl_test_flt, width_r, 0._pl_test_flt, &
height_r, 0._pl_test_flt, 0._pl_test_flt, img_min, img_max, xg1, yg1)
deallocate(xg1, yg1)
end if
deallocate( img_f, xg, yg )
call plend()
stop
contains
! Callback function that relies on global width, height, xmin, xmax, ymin, ymax
subroutine mypltr( x, y, xt, yt )
! These callback arguments must have exactly these attributes.
real(kind=pl_test_flt), intent(in) :: x, y
real(kind=pl_test_flt), intent(out) :: xt, yt
xt = xmin + ((xmax-xmin)/real(width-1,kind=pl_test_flt))*x
yt = ymin + ((ymax-ymin)/real(height-1,kind=pl_test_flt))*y
end subroutine mypltr
! Callback function that uses data argument to pass required data.
subroutine mypltr_data( x, y, xt, yt, data )
! These callback arguments must have exactly these attributes.
real(kind=pl_test_flt), intent(in) :: x, y
real(kind=pl_test_flt), intent(out) :: xt, yt
type(c_ptr), intent(in) :: data
type(mypltr_data_type), pointer :: d
call c_f_pointer(data, d)
xt = d%xmin_data + ((d%xmax_data-d%xmin_data)/real(d%xpts_data-1,kind=pl_test_flt))*x
yt = d%ymin_data + ((d%ymax_data-d%ymin_data)/real(d%ypts_data-1,kind=pl_test_flt))*y
end subroutine mypltr_data
! Determine the unit of length (of 8 or less) for direct-access files
subroutine bytes_in_rec( bytes )
implicit none
integer bytes
character(len=8) string
integer ierr
open( 10, file = '_x20f_.bin', access = 'direct', recl = 1 )
string = "12345678"
bytes = 0
ierr = 0
do while(ierr == 0 .and. bytes < 8)
bytes = bytes + 1
write( 10, rec = 1, iostat = ierr ) string(1:bytes)
enddo
if(ierr /= 0) bytes = bytes -1
close( 10, status = 'delete' )
end subroutine bytes_in_rec
! Read image from file in binary ppm format
logical function read_img(fname, img_f, width, height, num_col)
character(*), intent(in) :: fname
integer, intent(out) :: width, height
real(kind=pl_test_flt), dimension(:,:), pointer :: img_f
integer num_col
character, dimension(8) :: img
character(len=80), dimension(2) :: ver
integer :: i, j, w, h, b
integer :: ierr
integer :: count
integer :: record
integer :: bytes = 0
integer :: lastlf = 0
integer :: first
integer :: last
integer :: pixel
! Naive grayscale binary ppm reading. If you know how to, improve it
open( 10, file = fname, status = 'old', iostat = ierr )
if (ierr .ne. 0 ) then
read_img = .false.
return
endif
!
! Read the first lines (count them for later re-reading)
!
count = 1
read( 10, '(a)', iostat = ierr ) ver(1)
! I only understand "P5"!
if (ver(1) .ne. 'P5' .or. ierr .ne. 0) then
read_img = .false.
return
endif
do
count = count + 1
read( 10, '(a)', iostat = ierr ) ver(1)
if (ierr .ne. 0) then
read_img = .false.
write(*,*) 'Error!'
return
endif
if (ver(1)(1:1) .ne. '#' ) then
exit
endif
enddo
! Found the line with the sizes, copy this one and the next
count = count + 1
read( 10, '(a)', iostat = ierr ) ver(2)
read( ver(1), * ) w, h
read( ver(2), * ) num_col
allocate( img_f(w,h) )
close( 10 )
!
! Read the second part - we need to do it the hard way :(
!
! Note:
! The algorithm works if the unit of record length is a byte or
! if it is a multiple therefore (up to 8 bytes are allowed).
! Background: Some compilers use a word (4 bytes) as the unit of
! length instead, but often provide a compile switch to use bytes,
! we can not rely on this though.
!
call bytes_in_rec( bytes )
open( 10, file = fname, access = 'direct', recl = 1 )
record = 0
do while ( count > 0 )
!
! Look for the end of the line with sizes
!
record = record + 1
read( 10, rec = record, iostat = ierr ) (img(i), i = 1,bytes )
if ( ierr .ne. 0 ) then
exit
endif
do i = 1,bytes
if ( img(i) == char(10) ) then
count = count - 1
lastlf = i
endif
enddo
enddo
!
! We have found the picture bytes!
! The picture needs to be flipped vertically.
! So do that rightaway
!
first = lastlf + 1
last = bytes
pixel = 0
do
do b = first, last
pixel = pixel + 1
if ( pixel <= h*w ) then
i = 1 + mod(pixel-1,w)
j = 1 + (pixel-1)/w
img_f(i,h-j+1) = real(ichar(img(b),kind=pl_test_flt))
endif
enddo
if ( pixel < h*w ) then
record = record + 1
read( 10, rec = record ) (img(b), b = 1,bytes )
first = 1
else
exit
endif
enddo
width = w
height = h
read_img = .true.
end function read_img
! Save plot
subroutine save_plot(fname)
character*(*) fname
integer cur_strm, new_strm
! Get current stream
call plgstrm(cur_strm)
! Create a new one
call plmkstrm(new_strm)
! New device type. Use a known existing driver
call plsdev('psc')
call plsfnam(fname)
! Copy old stream parameters to new stream
call plcpstrm(cur_strm, .false.)
call plreplot()
call plend1()
! Return to previous one
call plsstrm(cur_strm)
end subroutine save_plot
! Get selection square interactively
logical function get_clip(xi, xe, yi, ye)
real(kind=pl_test_flt) xi, xe, yi, ye
type(PLGraphicsIn) :: gin
real(kind=pl_test_flt) :: xxi, yyi, xxe, yye, t
logical st, start
real(kind=pl_test_flt) sx(5), sy(5)
integer PLK_Return
data PLK_Return / Z'0D' /
integer hex100
data hex100 / Z'100' /
xxi = xi
yyi = yi
xxe = xe
yye = ye
start = .false.
! Enter xor mode to draw a selection rectangle
call plxormod(.true., st)
! Driver has xormod capability, continue
if (st) then
do while (.true.)
call plxormod(.false., st)
plgetcursor_rc = plgetcursor(gin)
call plxormod(.true., st)
if (gin%button .eq. 1) then
xxi = gin%wX
yyi = gin%wY
if (start) then
! Clear previous rectangle
call plline(sx, sy)
endif
start = .false.
sx(1) = xxi
sy(1) = yyi
sx(5) = xxi
sy(5) = yyi
endif
if (iand(gin%state,hex100).ne.0) then
xxe = gin%wX
yye = gin%wY
if (start) then
! Clear previous rectangle
call plline(sx, sy)
endif
start = .true.
sx(3) = xxe
sy(3) = yye
sx(2) = xxe
sy(2) = yyi
sx(4) = xxi
sy(4) = yye
! Draw new rectangle
call plline(sx, sy)
endif
if ((gin%button .eq. 3).or.(gin%keysym .eq. PLK_Return).or.(gin%keysym .eq. ichar('Q'))) then
if (start) then
! Clear previous rectangle
call plline(sx, sy)
exit
endif
endif
enddo
! Leave xor mode
call plxormod(.false., st)
if (xxe .lt. xxi) then
t = xxi
xxi = xxe
xxe = t
endif
if (yyi .lt. yye) then
t = yyi
yyi = yye
yye = t
endif
xe = xxe
xi = xxi
ye = yye
yi = yyi
get_clip = (gin%keysym .eq. ichar('Q'))
! get_clip = .false.
else
! driver has no xormod capability, just do nothing
get_clip = .false.
return
endif
end function get_clip
! Set gray colormap
subroutine gray_cmap(num_col)
integer num_col
real(kind=pl_test_flt) r(2), g(2), b(2), pos(2)
logical rev(1)
r(1) = 0.0
g(1) = 0.0
b(1) = 0.0
r(2) = 1.0
g(2) = 1.0
b(2) = 1.0
pos(1) = 0.0
pos(2) = 1.0
rev(1) = .false.
call plscmap1n(num_col)
call plscmap1l(.true., pos, r, g, b, rev)
end subroutine gray_cmap
!----------------------------------------------------------------------------
! Subroutine a2mmx
! 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=pl_test_flt) 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 subroutine a2mnmx
end program x20f
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