shp_polygonz_t Struct Reference

PolygonZ. More...

#include <shp-polygonz.h>

Public Member Functions
size_t	shp_polygonz_points (const shp_polygonz_t *polygonz, size_t part_num, size_t *start, size_t *end)
	Get the points that form a part. More...
void	shp_polygonz_pointz (const shp_polygonz_t *polygonz, size_t point_num, shp_pointz_t *pointz)
	Get a PointZ. More...

Data Fields
double	x_min
	X minimum value.
double	x_max
	X maximum value.
double	y_min
	Y minimum value.
double	y_max
	Y maximum value.
double	z_min
	Z minimum value.
double	z_max
	Z maximum value.
double	m_min
	M minimum value.
double	m_max
	M maximum value.
size_t	num_parts
	Number of parts.
size_t	num_points
	Total number of points.

Detailed Description

A PolygonZ consists of one or more parts. A part is a connected sequence of four or more points that form a closed, non-self-intersecting loop. Each point is associated with a measure, for example a temperature.

Member Function Documentation

shp_polygonz_points()

size_t shp_polygonz_points	(	const shp_polygonz_t *	polygonz,
		size_t	part_num,
		size_t *	start,
		size_t *	end
	)

Gets the indices for the points specified by part_num.

Parameters

	polygonz	a PolygonZ.
	part_num	a zero-based part number.
[out]	start	the range start.
[out]	end	the range end (exclusive).

Returns

the number of points in the part. At least 4 if the part is valid.

See also

shp_polygonz_pointz

shp_polygonz_pointz()

void shp_polygonz_pointz	(	const shp_polygonz_t *	polygonz,
		size_t	point_num,
		shp_pointz_t *	pointz
	)

Gets a PointZ that belongs to the edges of a PolygonZ.

Example

// Iterate over all parts and points
size_t part_num, i, n;
shp_pointz_t pointz;
 
for (part_num = 0; part_num < polygonz->num_parts; ++part_num) {
  shp_polygonz_points(polygonz, part_num, &i, &n);
  while (i < n) {
    shp_polygonz_pointz(polygonz, i, &pointz);
    ++i;
  }
}

Parameters

	polygonz	a PolygonZ.
	point_num	a zero-based point number.
[out]	pointz	a shp_pointz_t structure.

See also

shp_polygonz_points

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

• shp-polygonz.h