bnd_circle.c File Reference

Set of functions to calculate a bounding circle around a certain set of points. More...

#include "config.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <float.h>
#include "geometry.h"
#include "utils_core.h"
#include "basic_grid.h"
#include "ensure_array_size.h"

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Functions
void	yac_get_cell_circumscribe_circle_reg_quad (double a[3], double b[3], double c[3], struct bounding_circle *bnd_circle)
void	yac_get_cell_bounding_circle_reg_quad (double a[3], double b[3], double c[3], struct bounding_circle *bnd_circle)
void	yac_get_cell_circumscribe_circle_unstruct_triangle (double a[3], double b[3], double c[3], struct bounding_circle *bnd_circle)
static double	get_sin_vector_angle (double a[3], double b[3])
void	yac_get_cell_bounding_circle_unstruct_triangle (double a[3], double b[3], double c[3], struct bounding_circle *bnd_circle)
static struct sin_cos_angle	compute_edge_inc_angle (double *restrict a, double *restrict b, double *restrict middle_point)
void	yac_get_cell_bounding_circle (struct yac_grid_cell cell, struct bounding_circle *bnd_circle)
int	yac_extents_overlap (struct bounding_circle *extent_a, struct bounding_circle *extent_b)

Detailed Description

Set of functions to calculate a bounding circle around a certain set of points.

Definition in file bnd_circle.c.

Function Documentation

compute_edge_inc_angle()

static struct sin_cos_angle compute_edge_inc_angle ( double *restrict a, double *restrict b, double *restrict middle_point )

inlinestatic

Definition at line 148 of file bnd_circle.c.

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get_sin_vector_angle()

static double get_sin_vector_angle ( double a[3], double b[3] )

inlinestatic

Definition at line 80 of file bnd_circle.c.

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yac_extents_overlap()

int yac_extents_overlap	(	struct bounding_circle *	extent_a,
		struct bounding_circle *	extent_b )

checks whether two extents overlap

Parameters

[in]	extent_a	bounding circle
[in]	extent_b	bounding circle

Returns

0 if the bounding circles do not overlap

Examples

test_bnd_sphere_part.c, and test_geometry.c.

Definition at line 204 of file bnd_circle.c.

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yac_get_cell_bounding_circle()

void yac_get_cell_bounding_circle	(	struct yac_grid_cell	cell,
		struct bounding_circle *	bnd_circle )

gets the bounding circle for a grid cell

Parameters

[in]	cell	grid cell (coordinates have to be in radian)
[out]	bnd_circle	bounding circle of the grid cell

Examples

test_cell_bnd_circle.c.

Definition at line 160 of file bnd_circle.c.

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yac_get_cell_bounding_circle_reg_quad()

void yac_get_cell_bounding_circle_reg_quad	(	double	a[3],
		double	b[3],
		double	c[3],
		struct bounding_circle *	bnd_circle )

computes the smallest bounding circle for a triangle on the sphere

Parameters

[in]	a	coordinates of first point (xyz)
[in]	b	coordinates of second point (xyz)
[in]	c	coordinates of thrid point (xyz)
[out]	bnd_circle	bounding circle

Remarks

it is assumed that all edges of the quad are either circles of longitude or latitude

Examples

test_cell_bnd_circle.c.

Definition at line 36 of file bnd_circle.c.

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yac_get_cell_bounding_circle_unstruct_triangle()

void yac_get_cell_bounding_circle_unstruct_triangle	(	double	a[3],
		double	b[3],
		double	c[3],
		struct bounding_circle *	bnd_circle )

computes the smallest bounding circle for a triangle on the sphere

Parameters

[in]	a	coordinates of first point (xyz)
[in]	b	coordinates of second point (xyz)
[in]	c	coordinates of thrid point (xyz)
[out]	bnd_circle	bounding circle

Remarks

it is assumed that all three edges of the triangle are great circles

Examples

test_cell_bnd_circle.c.

Definition at line 93 of file bnd_circle.c.

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yac_get_cell_circumscribe_circle_reg_quad()

void yac_get_cell_circumscribe_circle_reg_quad	(	double	a[3],
		double	b[3],
		double	c[3],
		struct bounding_circle *	bnd_circle )

computes the circumscribe circle for a quad on the sphere

Parameters

[in]	a	coordinates of first point (xyz)
[in]	b	coordinates of second point (xyz)
[in]	c	coordinates of thrid point (xyz)
[out]	bnd_circle	circumscribe circle

Remarks

it is assumed that all edges of the quad are either circles of longitude or latitude

Examples

test_cell_bnd_circle.c.

Definition at line 27 of file bnd_circle.c.

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yac_get_cell_circumscribe_circle_unstruct_triangle()

void yac_get_cell_circumscribe_circle_unstruct_triangle	(	double	a[3],
		double	b[3],
		double	c[3],
		struct bounding_circle *	bnd_circle )

computes the circumscribe circle for a triangle on the sphere

Parameters

[in]	a	coordinates of first point (xyz)
[in]	b	coordinates of second point (xyz)
[in]	c	coordinates of thrid point (xyz)
[out]	bnd_circle	circumscribe circle

Remarks

it is assumed that all three edges of the triangle are great circles

Examples

test_cell_bnd_circle.c.

Definition at line 45 of file bnd_circle.c.

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