DatumHuePlatform v0.0.24datumhue.com
Contents

handle3 methods, 2 fields

DataView

Viewport-aware downsampled projection of a DataHandle. Created by h:view(options).

Obtained from
DataHandle:view
Accepted by
PlotArea:line, PlotArea:points, PlotArea:area

The examples on this page start from:

lua
local lines = { "t,v" }
for t = 1, 1000 do
    lines[#lines + 1] = t .. "," .. math.sin(t / 50)
end
local wave = datumhue.bytes(table.concat(lines, "\n")):csv()
local view =
    wave:view({ x_column = "t", y_column = "v", pixel_width = 100 })

Fields 2

FieldTypeAccessDescription
pixel_widthintegerread/writeX-axis downsampling pixel budget. Assigning re-downsamples.
pixel_heightintegerread/writeY-axis downsampling pixel budget. Assigning re-downsamples.

Methods 3

DataView:set_range

method
DataView:set_range(options: data.SetRangeOptions)

Update the viewport range; omitted keys are left unchanged.

Example
-- Bounds left out keep their value; "auto" fits one to the data.
view:set_range({ x_min = 100, x_max = 200 })
local range = view:range()
print(range.x_min, range.x_max) --> 100.0 200.0

options data.SetRangeOptions options 4 keys, 4 inherited Omitted keys keep their current value.

KeyTypeDescription
From data.RangeBounds
x_minnumber | stringLower x bound: a number, or "auto" to fit the data.
x_maxnumber | stringUpper x bound: a number, or "auto".
y_minnumber | stringLower y bound: a number, or "auto".
y_maxnumber | stringUpper y bound: a number, or "auto".

DataView:range

methodsuspends
DataView:range() -> table

Effective viewport range {x_min, x_max, y_min, y_max} with resolved auto values. Raises if the view was removed.

Example
-- "auto" bounds read back as the values they resolved to.
local range = view:range()
print(range.x_min, range.x_max) --> 1.0 1000.0

DataView:remove

method
DataView:remove()

Remove the DataView and free its resources.

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Victor Mono is licensed under the SIL Open Font License 1.1
Copyright (c) 2024, Rune Bjørnerås (https://github.com/rubjo)

This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL


-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------

PREAMBLE
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with others.

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to any document created using the fonts or their derivatives.

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