dataquad.h File Reference

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Data Structures
struct	triple
struct	quaddata

Macros
#define	NW   1
#define	NE   2
#define	SW   3
#define	SE   4

Functions
struct triple *	quad_point_new (double, double, double, double)
struct quaddata *	quad_data_new (double, double, double, double, int, int, int, int)
int	quad_compare (struct triple *, struct quaddata *)
int	quad_add_data (struct triple *, struct quaddata *, double)
int	quad_intersect (struct quaddata *, struct quaddata *)
int	quad_division_check (struct quaddata *, int)
struct quaddata **	quad_divide_data (struct quaddata *, int, double)
int	quad_get_points (struct quaddata *, struct quaddata *, int)

Macro Definition Documentation

NE

#define NE   2

Definition at line 29 of file dataquad.h.

NW

#define NW   1

Definition at line 28 of file dataquad.h.

SE

#define SE   4

Definition at line 31 of file dataquad.h.

SW

#define SW   3

Definition at line 30 of file dataquad.h.

Function Documentation

quad_add_data()

int quad_add_data	(	struct triple *	point,
		struct quaddata *	data,
		double	dmin
	)

Add point to a given data.

Definition at line 139 of file dataquad.c.

quad_compare()

int quad_compare	(	struct triple *	point,
		struct quaddata *	data
	)

Return the quadrant the point should be inserted in

Definition at line 95 of file dataquad.c.

quad_data_new()

struct quaddata* quad_data_new	(	double	x_or,
		double	y_or,
		double	xmax,
		double	ymax,
		int	rows,
		int	cols,
		int	n_points,
		int	kmax
	)

Initialize quaddata structure with given arguments

This is a constructor of the quaddata structure and it allocates memory. It also creates (and allocates memory for) the given number of points (given by kmax). The point attributes are set to zero.

Definition at line 59 of file dataquad.c.

quad_divide_data()

struct quaddata** quad_divide_data	(	struct quaddata *	data,
		int	kmax,
		double	dmin
	)

Divide data into four new ones

Divides data into 4 new data reinserting data->points in them by calling data function quad_compare() to determine were to insert. Returns array of 4 new data (allocates memory).

Definition at line 226 of file dataquad.c.

quad_division_check()

int quad_division_check	(	struct quaddata *	data,
		int	kmax
	)

Check if data needs to be divided

Checks if data needs to be divided. If data->points is empty, returns -1; if its not empty but there aren't enough points in data for division returns 0. Otherwise (if its not empty and there are too many points) returns 1.

Returns

1 if division is needed

0 if division is not needed

-1 if there are no points

Definition at line 209 of file dataquad.c.

quad_get_points()

int quad_get_points	(	struct quaddata *	data_inter,
		struct quaddata *	data,
		int	MAX
	)

Gets such points from data that lie within region determined by data_inter. Called by tree function region_data().

Definition at line 305 of file dataquad.c.

quad_intersect()

int quad_intersect	(	struct quaddata *	data_inter,
		struct quaddata *	data
	)

Check intersection of two quaddata structures

Checks if region defined by data intersects the region defined by data_inter.

Definition at line 176 of file dataquad.c.

quad_point_new()

struct triple* quad_point_new	(	double	x,
		double	y,
		double	z,
		double	sm
	)

Initialize point structure with given arguments

This is a constructor of the point structure and it allocates memory.

Note

Smoothing is part of the point structure

Definition at line 36 of file dataquad.c.

References malloc(), NULL, triple::sm, x, triple::x, triple::y, and triple::z.