log_display.h File Reference

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Classes
struct	_bl_bl_log_display_data

Typedefs
typedef struct _bl_bl_log_display_data	bl_log_display_data

Functions
bl_log_display_data *	bl_make_log_display_data (double width, double height)
void	bl_log_display_add (bl_log_display_data *data, double x, double y)
double	bl_log_display_get_value (bl_log_display_data *data, double x, double y)

Typedef Documentation

bl_log_display_data

typedef struct _bl_bl_log_display_data bl_log_display_data

A structure to hold information about quantitative draws to a bitmap.

Rather than directly drawing each pixel, you mark it as hit in this data struct. When you are done markeing pixels, you can get the value for each pixel which will be calculated on a logarithmic scale based on the pixel that got the most hits.

Function Documentation

bl_log_display_add()

void bl_log_display_add	(	bl_log_display_data *	data,
		double	x,
		double	y
	)

Marks a pixel as hit in a bl_log_display_data instance.

Hits are cumulative and will later be scaled logarithmically.

Parameters

bl_log_display_data	*data The bl_log_display_data to add to.
double	x The x value of the pixel to add.
double	y The y value of the pixel to add.

Examples

bl_log_display_add(data, 100, 100);

bl_log_display_get_value()

double bl_log_display_get_value	(	bl_log_display_data *	data,
		double	x,
		double	y
	)

Gets the logarithmically scaled value for a pixel.

Parameters

bl_log_display_data	*data The bl_log_display_data to retrieve a value from.
double	x The x value of the pixel.
double	y The y value of the pixel. returns double

Examples

double value = bl_log_display_get_value(data, 100, 100);

bl_make_log_display_data()

bl_log_display_data* bl_make_log_display_data	(	double	width,
		double	height
	)

Creates an instance of bl_log_display_data.

Be sure to free the instance when you are done.

Parameters

double	width The width of the bitmap you will be drawing to.
double	height The height of the bitmap you will be drawing to.

Returns

bl_log_display_data*

Examples

bl_log_display_data *data = bl_make_log_display_data(400, 400);