/usr/share/doc/libplplot12/examples/f95/x03f.f90 is in libplplot-dev 5.10.0+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | ! $Id: x03f.f90 12094 2011-12-03 08:35:52Z andrewross $
! Generates polar plot with, 1-1 scaling
!
! 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
program x03f95
use plplot, PI => PL_PI
use plf95demolib
implicit none
character (len=3) :: text
real(kind=plflt), dimension(0:360) :: x0, y0, x, y
real(kind=plflt) :: dtr, theta, dx, dy, offset
integer :: i
! Process command-line arguments
call plparseopts(PL_PARSE_FULL)
! Set orientation to portrait - note not all device drivers
! support this, in particular most interactive drivers do not.
call plsori(1)
dtr = PI/180.0_plflt
x0 = cos(dtr * arange(0,361))
y0 = sin(dtr * arange(0,361))
! Initialize PLplot
call plinit()
! Set up viewport and window, but do not draw box
call plenv(-1.3_plflt, 1.3_plflt, -1.3_plflt, 1.3_plflt, 1, -2)
! Draw circles for polar grid
do i = 1,10
call plarc(0.0_plflt, 0.0_plflt, 0.1_plflt*i, 0.1_plflt*i, &
0.0_plflt, 360.0_plflt, 0.0_plflt, 0)
enddo
call plcol0(2)
do i = 0,11
theta = 30.0_plflt*i
dx = cos(dtr*theta)
dy = sin(dtr*theta)
! Draw radial spokes for polar grid
call pljoin(0.0_plflt, 0.0_plflt, dx, dy)
write (text,'(i3)') nint(theta)
! Write labels for angle
text = adjustl(text)
if (theta .lt. 9.99) then
offset = 0.45
elseif (theta .lt. 99.9) then
offset = 0.30
else
offset = 0.15
endif
! Slightly off zero to avoid floating point logic flips at
! 90 and 270 deg.
if (dx >= -0.00001_plflt) then
call plptex(dx, dy, dx, dy, -offset, text)
else
call plptex(dx, dy, -dx, -dy, 1._plflt+offset, text)
end if
enddo
! Draw the graph
x = x0 * sin(5.0_plflt * dtr * arange(0,361))
y = y0 * sin(5.0_plflt * dtr * arange(0,361))
call plcol0(3)
call plline(x,y)
call plcol0(4)
call plmtex('t', 2.0_plflt, 0.5_plflt, 0.5_plflt, &
'#frPLplot Example 3 - r(#gh)=sin 5#gh')
! Close the plot at end
call plend
end program x03f95
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