geometry.c File Reference

#include <neatogen/geometry.h>
#include <math.h>
#include <stddef.h>

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Functions
void	geominit (void)
double	dist_2 (Point pp, Point qp)
	distance squared between two points
void	subpt (Point *a, Point b, Point c)
void	addpt (Point *c, Point a, Point b)
double	area_2 (Point a, Point b, Point c)
int	leftOf (Point a, Point b, Point c)
int	intersection (Point a, Point b, Point c, Point d, Point *p)

Variables
double	xmin
double	xmax
double	ymin
double	ymax
double	deltax
size_t	nsites
int	sqrt_nsites

Function Documentation

addpt()

void addpt	(	Point *	c,
		Point	a,
		Point	b
	)

Definition at line 42 of file geometry.c.

References Point::x, and Point::y.

Referenced by polyOverlap().

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area_2()

double area_2	(	Point	a,
		Point	b,
		Point	c
	)

Definition at line 48 of file geometry.c.

References Point::x, and Point::y.

Referenced by edgesIntersect(), and leftOf().

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dist_2()

double dist_2	(	Point	pp,
		Point	qp
	)

Definition at line 29 of file geometry.c.

References dx, dy, Point::x, and Point::y.

Referenced by addCorners().

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geominit()

void geominit

(

void

)

Definition at line 21 of file geometry.c.

References nsites, and sqrt_nsites.

Referenced by makeInfo().

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intersection()

int intersection	(	Point	a,
		Point	b,
		Point	c,
		Point	d,
		Point *	p
	)

Definition at line 58 of file geometry.c.

References Point::x, and Point::y.

leftOf()

int leftOf	(	Point	a,
		Point	b,
		Point	c
	)

Definition at line 53 of file geometry.c.

References area_2().

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subpt()

void subpt	(	Point *	a,
		Point	b,
		Point	c
	)

Definition at line 36 of file geometry.c.

References Point::x, and Point::y.

Referenced by edgesIntersect().

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Variable Documentation

deltax

double deltax

Definition at line 16 of file geometry.c.

Referenced by ELleftbnd(), geomUpdate(), and makeClustObs().

nsites

size_t nsites

Definition at line 18 of file geometry.c.

Referenced by addCorners(), chkBoundBox(), countOverlap(), freeNodes(), geominit(), geomUpdate(), makeInfo(), newPos(), rePos(), sortSites(), and updateGraph().

sqrt_nsites

int sqrt_nsites

Definition at line 19 of file geometry.c.

Referenced by ELinitialize(), geominit(), getfree(), and PQinitialize().

xmax

double xmax

Definition at line 15 of file geometry.c.

Referenced by findHorizontal(), geomUpdate(), make_map_internal(), poly_init(), and QuadTree_new_from_point_list().

xmin

double xmin

Definition at line 15 of file geometry.c.

Referenced by ELleftbnd(), findHorizontal(), geomUpdate(), make_map_internal(), and QuadTree_new_from_point_list().

ymax

double ymax

Definition at line 15 of file geometry.c.

Referenced by findVertical(), geomUpdate(), poly_init(), and PQbucket().

ymin

double ymin

Definition at line 15 of file geometry.c.

Referenced by findVertical(), geomUpdate(), make_map_internal(), PQbucket(), and QuadTree_get_nearest().