shp_polygonm_t Struct Reference

PolygonM. More...

#include <shp-polygonm.h>

Public Member Functions
size_t	shp_polygonm_points (const shp_polygonm_t *polygonm, size_t part_num, size_t *start, size_t *end)
	Get the points that form a part.
void	shp_polygonm_pointm (const shp_polygonm_t *polygonm, size_t point_num, shp_pointm_t *pointm)
	Get a PointM.

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	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 PolygonM 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_polygonm_points()

size_t shp_polygonm_points	(	const shp_polygonm_t *	polygonm,
		size_t	part_num,
		size_t *	start,
		size_t *	end
	)

Gets the indices for the points specified by part_num.

Parameters

	polygonm	a PolygonM.
	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_polygonm_pointm

shp_polygonm_pointm()

void shp_polygonm_pointm	(	const shp_polygonm_t *	polygonm,
		size_t	point_num,
		shp_pointm_t *	pointm
	)

Gets a PointM that belongs to the edges of a PolygonM.

Example

// Iterate over all parts and points
size_t part_num, i, n;
shp_pointm_t pointm;
 
for (part_num = 0; part_num < polygonm->num_parts; ++part_num) {
  shp_polygonm_points(polygonm, part_num, &i, &n);
  while (i < n) {
    shp_polygonm_pointm(polygonm, i, &pointm);
    ++i;
  }
}

Parameters

	polygonm	a PolygonM.
	point_num	a zero-based point number.
[out]	pointm	a shp_pointm_t structure.

See also

shp_polygonm_points

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

• shp-polygonm.h