/usr/share/doc/libplplot12/examples/lua/x26.lua 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 | --[[ -*- coding: utf-8 -*-
$Id: x26.lua 12331 2013-05-03 02:41:21Z airwin $
Multi-lingual version of the first page of example 4.
Copyright (C) 2009 Werner Smekal
Thanks to the following for providing translated strings for this example:
Valery Pipin (Russian)
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
--]]
--[[
This example designed just for devices (e.g., psttfc and the
cairo-related devices) that use the pango and fontconfig libraries. The
best choice of glyph is selected by fontconfig and automatically rendered
by pango in way that is sensitive to complex text layout (CTL) language
issues for each unicode character in this example. Of course, you must
have the appropriate TrueType fonts installed to have access to all the
required glyphs.
Translation instructions: The strings to be translated are given by
x_label, y_label, alty_label, title_label, and line_label below. The
encoding used must be UTF-8.
The following strings to be translated involve some scientific/mathematical
jargon which is now discussed further to help translators.
(1) dB is a decibel unit, see http://en.wikipedia.org/wiki/Decibel .
(2) degrees is an angular measure, see
http://en.wikipedia.org/wiki/Degree_(angle) .
(3) low-pass filter is one that transmits (passes) low frequencies.
(4) pole is in the mathematical sense, see
http://en.wikipedia.org/wiki/Pole_(complex_analysis) . "Single Pole"
means a particular mathematical transformation of the filter function has
a single pole, see
http://ccrma.stanford.edu/~jos/filters/Pole_Zero_Analysis_I.html .
Furthermore, a single-pole filter must have an inverse square decline
(or -20 db/decade). Since the filter plotted here does have that
characteristic, it must by definition be a single-pole filter, see also
http://www-k.ext.ti.com/SRVS/Data/ti/KnowledgeBases/analog/document/faqs/1p.htm
(5) decade represents a factor of 10, see
http://en.wikipedia.org/wiki/Decade_(log_scale) .
--]]
-- initialise Lua bindings for PLplot examples.
dofile("plplot_examples.lua")
x_label = { "Frequency", "Частота" }
y_label = { "Amplitude (dB)", "Амплитуда (dB)" }
alty_label = { "Phase shift (degrees)", "Фазовый сдвиг (градусы)" }
-- Short rearranged versions of y_label and alty_label.
legend_text = {
{"Amplitude", "Phase shift"},
{"Амплитуда", "Фазовый сдвиг"}
}
title_label = { "Single Pole Low-Pass Filter", "Однополюсный Низко-Частотный Фильтр" }
line_label = { "-20 dB/decade", "-20 dB/десяток" }
-- return single bit (for OR)
function bit(x,b)
return ((x % 2^b) - (x % 2^(b-1)) > 0)
end
-- logic OR for number values
function lor(x,y)
result = 0
for p=1,8 do result = result + (((bit(x,p) or bit(y,p)) == true) and 2^(p-1) or 0) end
return result
end
----------------------------------------------------------------------------
-- plot1
--
-- Log-linear plot.
----------------------------------------------------------------------------
function plot1(type, x_label, y_label, alty_label, title_label, line_label, legend_text)
freql = {}
ampl = {}
phase = {}
pl.adv(0)
-- Set up data for log plot
f0 = 1
for i = 1, 101 do
freql[i] = -2 + (i-1)/20
freq = 10^freql[i]
ampl[i] = 20 * math.log10(1/math.sqrt(1+(freq/f0)^2))
phase[i] = -180/math.pi*math.atan(freq/f0)
end
pl.vpor(0.15, 0.85, 0.1, 0.9)
pl.wind(-2, 3, -80, 0)
-- Try different axis and labelling styles.
pl.col0(1)
if type==0 then
pl.box("bclnst", 0, 0, "bnstv", 0, 0)
elseif type==1 then
pl.box("bcfghlnst", 0, 0, "bcghnstv", 0, 0)
else
pl.abort("type must be 0 or 1")
pl.plend()
os.exit()
end
-- Plot ampl vs freq
pl.col0(2)
pl.line(freql, ampl)
pl.col0(2)
pl.ptex(1.6, -30, 1, -20, 0.5, line_label)
-- Put labels on
pl.col0(1)
pl.mtex("b", 3.2, 0.5, 0.5, x_label)
pl.mtex("t", 2, 0.5, 0.5, title_label)
pl.col0(2)
pl.mtex("l", 5, 0.5, 0.5, y_label)
-- For the gridless case, put phase vs freq on same plot
if type==0 then
pl.col0(1)
pl.wind(-2, 3, -100, 0)
pl.box("", 0, 0, "cmstv", 30, 3)
pl.col0(3)
pl.line(freql, phase)
pl.string(freql, phase, "*")
pl.col0(3)
pl.mtex("r", 5, 0.5, 0.5, alty_label)
nlegend = 2
else
nlegend = 1
end
-- Draw a legend.
opt_array = {}
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 = {}
-- Data for the first legend entry.
opt_array[1] = pl.PL_LEGEND_LINE
text_colors[1] = 2
text[1] = legend_text[1]
-- box data unused so initialize to arbitrary values.
box_colors[1] = 0
box_patterns[1] = 0
box_scales[1] = 0
box_line_widths[1] = 0.
line_colors[1] = 2
line_styles[1] = 1
line_widths[1] = 1.
-- unused arbitrary data
symbol_colors[1] = 0
symbol_scales[1] = 0
symbol_numbers[1] = 0
symbols[1] = ""
-- Data for the second legend entry.
if nlegend > 1 then
opt_array[2] = lor(pl.PL_LEGEND_LINE, pl.PL_LEGEND_SYMBOL)
text_colors[2] = 3
text[2] = legend_text[2]
-- box data unused so initialize to arbitrary values.
box_colors[2] = 0
box_patterns[2] = 0
box_scales[2] = 0
box_line_widths[2] = 0.
line_colors[2] = 3
line_styles[2] = 1
line_widths[2] = 1.
symbol_colors[2] = 3
symbol_scales[2] = 1.
symbol_numbers[2] = 4
symbols[2] = "*"
end
pl.scol0a( 15, 32, 32, 32, 0.70 )
legend_width, legend_height = pl.legend(
lor(pl.PL_LEGEND_BACKGROUND, pl.PL_LEGEND_BOUNDING_BOX), 0, 0.0, 0.0,
0.1, 15, 1, 1, 0, 0, opt_array, 1.0, 1.0, 2.0,
1., 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
----------------------------------------------------------------------------
-- main
--
-- Illustration of logarithmic axes, and redefinition of window.
----------------------------------------------------------------------------
-- Parse and process command line arguments
pl.parseopts(arg, pl.PL_PARSE_FULL)
-- Initialize plplot
pl.init()
nlang = # x_label
if nlang ~= (# y_label) or
nlang ~= (# alty_label) or
nlang ~= (# title_label) or
nlang ~= (# line_label) or
nlang ~= (# legend_text) then
pl.abort("All data must be expressed in the same number of languages")
pl.plend()
os.exit()
end
pl.font(2)
-- Make log plots using two different styles.
for i = 1, nlang do
plot1(0, x_label[i], y_label[i], alty_label[i], title_label[i], line_label[i], legend_text[i])
end
pl.plend()
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