/usr/share/doc/libplplot11/examples/f77/x04f.f is in libplplot-dev 5.9.9-2ubuntu2.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | c $Id: x04f.fm4 11717 2011-04-21 00:47:06Z airwin $
c Illustration of logarithmic axes, and redefinition of window
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'
c Process command-line arguments
call plparseopts(PL_PARSE_FULL)
call plinit
call plfont(2)
c Make log plots using two different styles.
call plot1(0)
call plot1(1)
call plend
end
subroutine plot1(type)
implicit none
include 'plplot_parameters.h'
real*8 freql(0:100),ampl(0:100),phase(0:100), freq, f0
integer i, type
real*8 legend_width, legend_height
integer nlegend
integer opt_array(2), text_colors(2), line_colors(2),
& line_styles(2), line_widths(2), symbol_colors(2),
& symbol_numbers(2)
real*8 symbol_scales(2)
integer box_colors(1), box_patterns(1), box_line_widths(1)
real*8 box_scales(1)
character*20 text(2)
character*1 symbols(2)
call pladv(0)
c Set up data for log plot.
f0 = 1.d0
do i=0,100
freql(i)= -2.0d0 + dble (i)/20.0d0
freq=10.0d0**freql(i)
ampl(i)=20.0d0*log10(1.0d0/sqrt(1.0d0+(freq/f0)**2))
phase(i)=-(180.0d0/PI)*atan(freq/f0)
enddo
call plvpor(0.15d0, 0.85d0, 0.1d0, 0.9d0)
call plwind(-2.0d0, 3.0d0, -80.0d0, 0.0d0)
call plcol0(1)
c Try different axis and labelling styles.
if (type.eq.0) then
call plbox('bclnst', 0.0d0, 0, 'bnstv', 0.0d0, 0)
elseif (type.eq.1) then
call plbox('bcfghlnst', 0.0d0, 0, 'bcghnstv', 0.0d0, 0)
else
stop 'plot1: invalid type'
endif
c Plot ampl vs freq.
call plcol0(2)
call plline(101,freql,ampl)
call plcol0(2)
call plptex(1.6d0, -30.0d0, 1.0d0, -20.0d0, 0.5d0,
& '-20 dB/decade')
c Put labels on.
call plcol0(1)
call plmtex('b', 3.2d0, 0.5d0, 0.5d0, 'Frequency')
call plmtex('t', 2.0d0, 0.5d0, 0.5d0,
& 'Single Pole Low-Pass Filter')
call plcol0(2)
call plmtex('l', 5.0d0, 0.5d0, 0.5d0, 'Amplitude (dB)')
nlegend = 1
c For the gridless case, put phase vs freq on same plot.
if(type.eq.0) then
call plcol0(1)
call plwind(-2.0d0, 3.0d0, -100.0d0, 0.0d0)
call plbox(' ', 0.0d0, 0, 'cmstv', 30.0d0, 3)
call plcol0(3)
call plline(101,freql,phase)
call plstring(101,freql,phase,'*')
call plcol0(3)
call plmtex('r', 5.0d0, 0.5d0, 0.5d0,
& 'Phase shift (degrees)')
nlegend = 2
endif
c Draw a legend
c First legend entry.
opt_array(1) = PL_LEGEND_LINE
text_colors(1) = 2
text(1) = 'Amplitude'
line_colors(1) = 2
line_styles(1) = 1
line_widths(1) = 1
c note from the above opt_array the first symbol (and box) indices
c do not have to be specified
c Second legend entry.
opt_array(2) = PL_LEGEND_LINE + PL_LEGEND_SYMBOL
text_colors(2) = 3
text(2) = 'Phase shift'
line_colors(2) = 3
line_styles(2) = 1
line_widths(2) = 1
symbol_colors(2) = 3
symbol_scales(2) = 1.0
symbol_numbers(2) = 4
symbols(2) = '*'
c from the above opt_arrays we can completely ignore everything
c to do with boxes.
call plscol0a( 15, 32, 32, 32, 0.70d0 )
call pllegend( legend_width, legend_height,
& PL_LEGEND_BACKGROUND + PL_LEGEND_BOUNDING_BOX, 0,
& 0.0d0, 0.0d0, 0.1d0, 15,
& 1, 1, 0, 0,
& nlegend, opt_array,
& 1.0d0, 1.0d0, 2.0d0,
& 1.0d0, text_colors, text,
& box_colors, box_patterns, box_scales, box_line_widths,
& line_colors, line_styles, line_widths,
& symbol_colors, symbol_scales, symbol_numbers, symbols )
end
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