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The library that implements a model of a 2D plot with support for displaying functions of time (as in an oscilloscope).
Disclaimer: this library was written directly on an Android smartphone with the QLua IDE.
- models:
- 2D plot:
- storing:
- values of a displayed function;
- limits for these values;
- default value;
- operations:
- initializing:
- filling a specified count of values by a specified default value;
- iterating over values:
- via the __ipairs metamethod (for Lua 5.2);
- via the __index metamethod (for Lua 5.3+):
- support of fractional indexes;
- adding a new value:
- specific;
- with a shift from the last value:
- with a specific shift;
- with a random shift;
- using a specified default value as the last value if no values;
- clamping the added value to specified limits;
- removing the first value:
- returning the removed value:
- returning a specified default value if no values;
- returning the removed value:
- initializing:
- storing:
- 2D oscillogram:
- extending the 2D plot model;
- kinds:
- custom (adding a specific new value);
- linear (adding a new value with a specific shift from the last value);
- random (adding a new value with a random shift from the last value);
- operations:
- updating:
- first step: adding a new value;
- second step: removing the first value;
- updating:
- 2D plot/oscillogram iterator:
- storing:
- 2D plot/oscillogram;
- transformer for iterated values;
- iterating over values of 2D plot/oscillogram:
- via the __ipairs metamethod (for Lua 5.2);
- via the __index metamethod (for Lua 5.3+);
- applying transformations to iterated values via a specified transformer;
- storing:
- factory of a 2D plot/oscillogram iterator:
- storing:
- transformer for iterated values;
- generating a 2D plot/oscillogram iterator for a specific 2D plot/oscillogram;
- storing:
- 2D plot:
- global operations:
- calculating a difference (a distance) between two 2D plots/oscillograms in the same index:
- returning a difference (a distance) by modulo (optionally);
- selecting a value by a distance between two 2D plots/oscillograms in the specific index:
- selecting by the specified sequential distance ranges.
- calculating a difference (a distance) between two 2D plots/oscillograms in the same index:
$ luarocks install luaplot
luaplot.Plot:
-- luarocks install ansicolors 1.0.2-3
local colors = require("ansicolors")
local assertions = require("luatypechecks.assertions")
local Plot = require("luaplot.plot")
local function print_plot(plot, vertical_step)
assertions.is_instance(plot, Plot)
assertions.is_number(vertical_step)
local text = ""
for height = 1, 0, -vertical_step do
for _, point in ipairs(plot) do
local delta = math.abs(point - height)
local symbol = delta < vertical_step / 2
and colors("%{cyan}*%{reset}")
or "."
text = text .. symbol
end
text = text .. "\n"
end
print(text)
end
local function sleep(seconds)
assertions.is_number(seconds)
local start = os.clock()
while os.clock() - start < seconds do end
end
local SPEED = 0.25
local WIDTH = 40
local HEIGHT = 10
local VERTICAL_STEP = 1 / HEIGHT
local PRINT_DELAY = 1 / (SPEED * WIDTH)
local FACTOR = 1.5 * PRINT_DELAY
math.randomseed(os.time())
local plot = Plot:new(WIDTH, 0.5)
while true do
plot:shift()
plot:push_with_random_factor(FACTOR)
print_plot(plot, VERTICAL_STEP)
sleep(PRINT_DELAY)
endluaplot.Oscillogram:
-- luarocks install ansicolors 1.0.2-3
local colors = require("ansicolors")
local assertions = require("luatypechecks.assertions")
local Plot = require("luaplot.plot")
local Oscillogram = require("luaplot.oscillogram")
local function print_plot(plot, vertical_step)
assertions.is_instance(plot, Plot)
assertions.is_number(vertical_step)
local text = ""
for height = 1, 0, -vertical_step do
for _, point in ipairs(plot) do
local delta = math.abs(point - height)
local symbol = delta < vertical_step / 2
and colors("%{cyan}*%{reset}")
or "."
text = text .. symbol
end
text = text .. "\n"
end
print(text)
end
local function sleep(seconds)
assertions.is_number(seconds)
local start = os.clock()
while os.clock() - start < seconds do end
end
local SPEED = 0.25
local WIDTH = 40
local HEIGHT = 10
local VERTICAL_STEP = 1 / HEIGHT
local PRINT_DELAY = 1 / (SPEED * WIDTH)
local FACTOR = 1.5 * PRINT_DELAY
math.randomseed(os.time())
local plot = Oscillogram:new("random", WIDTH, 0.5)
while true do
plot:update(FACTOR)
print_plot(plot, VERTICAL_STEP)
sleep(PRINT_DELAY)
endluaplot.PlotIterator:
-- luarocks install inspect 3.1.3-0
local inspect = require("inspect")
local assertions = require("luatypechecks.assertions")
local checks = require("luatypechecks.checks")
local Plot = require("luaplot.plot")
local PlotIterator = require("luaplot.plotiterator")
local function print_iterable(iterable)
if _VERSION >= "Lua 5.3" then
assertions.is_true(
checks.is_sequence(iterable)
or checks.has_metamethods(iterable, {"__index"})
)
else
assertions.has_metamethods(iterable, {"__ipairs"})
end
local points = {}
for _, point in ipairs(iterable) do
table.insert(points, point)
end
print(inspect(points))
end
local plot = Plot:new(0)
for i = 1, 5 do
plot:push(i / 10)
end
print_iterable(plot)
local iterator_one = PlotIterator:new(plot, function(index, point)
assertions.is_number(index)
assertions.is_number(point)
return point * index
end)
print_iterable(iterator_one)
local iterator_two = PlotIterator:new(plot, function(index, point)
assertions.is_number(index)
assertions.is_number(point)
return { x = index, y = point }
end)
print_iterable(iterator_two)luaplot.PlotIteratorFactory:
-- luarocks install inspect 3.1.3-0
local inspect = require("inspect")
local assertions = require("luatypechecks.assertions")
local checks = require("luatypechecks.checks")
local Plot = require("luaplot.plot")
local PlotIteratorFactory = require("luaplot.plotiteratorfactory")
local function print_iterable(iterable)
if _VERSION >= "Lua 5.3" then
assertions.is_true(
checks.is_sequence(iterable)
or checks.has_metamethods(iterable, {"__index"})
)
else
assertions.has_metamethods(iterable, {"__ipairs"})
end
local points = {}
for _, point in ipairs(iterable) do
table.insert(points, point)
end
print(inspect(points))
end
local iterator = PlotIteratorFactory:new(function(index, point)
assertions.is_number(index)
assertions.is_number(point)
return { x = index, y = point }
end)
local plot_one = Plot:new(0)
for i = 1, 5 do
plot_one:push(i / 10)
end
print_iterable(iterator:with(plot_one))
local plot_two = Plot:new(0)
for i = 1, 5 do
plot_two:push(i / 20)
end
print_iterable(iterator:with(plot_two))Fractional indexes:
local iterators = require("luaplot.iterators")
local Plot = require("luaplot.plot")
local plot_one = Plot:new(0)
for i = 1, 5 do
plot_one:push(i / 10)
end
local plot_two = Plot:new(0)
for i = 1, 5 do
plot_two:push(i / 16)
end
local item_one = plot_one[3.2]
print(string.format("plot_one[3.2] = %g", item_one))
local item_two = plot_two[3.2]
print(string.format("plot_two[3.2] = %g", item_two))
local difference = iterators.difference(plot_one, plot_two, 3.2)
print(string.format("difference = %g", difference))Distance detection:
-- luarocks install ansicolors 1.0.2-3
local colors = require("ansicolors")
local assertions = require("luatypechecks.assertions")
local iterators = require("luaplot.iterators")
local Plot = require("luaplot.plot")
local Oscillogram = require("luaplot.oscillogram")
local DistanceLimit = require("luaplot.distancelimit")
local function print_plot(plot, vertical_step)
assertions.is_instance(plot, Plot)
assertions.is_number(vertical_step)
local text = ""
for height = 1, 0, -vertical_step do
for _, point in ipairs(plot) do
local delta = math.abs(point - height)
local symbol = delta < vertical_step / 2
and colors("%{cyan}*%{reset}")
or "."
text = text .. symbol
end
text = text .. "\n"
end
io.write(text)
end
local function sleep(seconds)
assertions.is_number(seconds)
local start = os.clock()
while os.clock() - start < seconds do end
end
local SPEED = 0.25
local WIDTH = 40
local HEIGHT = 5
local VERTICAL_STEP = 1 / HEIGHT
local PRINT_DELAY = 1 / (SPEED * WIDTH)
local FACTOR = 1.5 * PRINT_DELAY
math.randomseed(os.time())
local plot_one = Oscillogram:new("random", WIDTH, 0.5)
local plot_two = Oscillogram:new("random", WIDTH, 0.5)
while true do
plot_one:update(FACTOR)
plot_two:update(FACTOR)
local distance_marks = {}
for index = 1, WIDTH do
local distance_color =
iterators.select_by_distance(plot_one, plot_two, index, {
DistanceLimit:new(0.33, "green"),
DistanceLimit:new(0.66, "yellow"),
DistanceLimit:new(math.huge, "red"),
})
local distance_mark =
colors(string.format("%%{%s}#%%{reset}", distance_color))
table.insert(distance_marks, distance_mark)
end
print_plot(plot_one, VERTICAL_STEP)
print_plot(plot_two, VERTICAL_STEP)
for _ = 1, HEIGHT do
io.write(table.concat(distance_marks, "") .. "\n")
end
io.write("\n")
sleep(PRINT_DELAY)
endThe MIT License (MIT)
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