pulp::view::LogFrequencyScale Struct Reference

Maps frequency (Hz) to a horizontal pixel position on a logarithmic axis. More...

#include <graph_scale.hpp>

Public Member Functions
float	to_x (float hz) const
	Pixel x of a frequency.
float	to_frequency (float px) const
	Frequency at a pixel x. Inverse of to_x().
float	frequency_at (std::size_t index, std::size_t count) const
	Frequency of point index of count, log-spaced across the axis, so point i lands on evenly spaced pixel columns.
std::vector< float >	ticks () const
	Gridline frequencies in a 1-2-5 sequence per decade (20, 30, 50, 100, 200, …) clipped to [min_hz, max_hz].

Static Public Member Functions
static bool	is_major_tick (float hz)
	True for decade boundaries (100, 1k, 10k) — the lines conventionally drawn heavier and labeled.

Public Attributes
float	min_hz = 20.0f
float	max_hz = 20000.0f
float	x = 0.0f
	left edge, pixels
float	width = 0.0f
	axis width, pixels

Detailed Description

Maps frequency (Hz) to a horizontal pixel position on a logarithmic axis.

Frequency is perceived roughly logarithmically, so an audio frequency axis is log by default — an octave occupies the same width everywhere.

Member Function Documentation

frequency_at()

float pulp::view::LogFrequencyScale::frequency_at	(	std::size_t	index,
		std::size_t	count ) const

Frequency of point index of count, log-spaced across the axis, so point i lands on evenly spaced pixel columns.

Mirrors pulp::signal::log_frequency_at so a curve sampled in the DSP layer maps one-to-one onto this axis with no resampling.

is_major_tick()

bool pulp::view::LogFrequencyScale::is_major_tick ( float hz )

static

True for decade boundaries (100, 1k, 10k) — the lines conventionally drawn heavier and labeled.

ticks()

std::vector< float > pulp::view::LogFrequencyScale::ticks

(

)

const

Gridline frequencies in a 1-2-5 sequence per decade (20, 30, 50, 100, 200, …) clipped to [min_hz, max_hz].

to_frequency()

float pulp::view::LogFrequencyScale::to_frequency

(

float

px

)

const

Frequency at a pixel x. Inverse of to_x().

to_x()

float pulp::view::LogFrequencyScale::to_x

(

float

hz

)

const

Pixel x of a frequency.

Not clamped — callers plotting a curve want points just outside the viewport to keep the line's slope correct at the edges.

Member Data Documentation

max_hz

float pulp::view::LogFrequencyScale::max_hz = 20000.0f

min_hz

float pulp::view::LogFrequencyScale::min_hz = 20.0f

width

float pulp::view::LogFrequencyScale::width = 0.0f

axis width, pixels

x

float pulp::view::LogFrequencyScale::x = 0.0f

left edge, pixels

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The documentation for this struct was generated from the following file:

• /home/runner/work/pulp/pulp/core/view/include/pulp/view/graph_scale.hpp