Ui::Monitor::DensityImage Struct Reference

Detailed Description

An intensity accumulator for persistent displays (phosphor scopes, goniometers, spectrograms): hits add energy, decay() fades it, render() maps it to colours with a gamma.

Public Member Functions
void	resize (int w, int h)
void	clear ()
void	decay (float factor)
void	hit (double x, double y, float energy=1.f)
void	line (double x0, double y0, double x1, double y1, float energy=1.f)
void	buildGamma (float gamma)
template<typename F >
void	map (float full, float gamma, F &&f)
	Calls f(row, x, level 0-255) for every pixel, full energy at 255.
void	render (QColor color, float full, float gamma=0.5f)
	Maps the accumulator to color at full intensity for full energy.
void	render (ColorMap cmap, float full, float gamma=0.5f)
	Maps the accumulator through a colour map.

Public Attributes
int	width {}
int	height {}
std::vector< float >	acc
QImage	image
std::array< uint8_t, levels+1 >	gamma_lut {}
	Intensity level to 0-255 after the gamma, built when the gamma changes.
float	lut_gamma {-1.f}

Static Public Attributes
static constexpr int	levels = 1024
	Resolution of the intensities the gamma table maps.

Member Function Documentation

line()

void Ui::Monitor::DensityImage::line ( double  x0, double  y0, double  x1, double  y1, float  energy = 1.f  )

inline

A line of hits from (x0, y0) to (x1, y1), one per pixel step, sharing energy so that fast strokes are dimmer than slow ones, as on a CRT.

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

• Paint.hpp