shapereader
Read ESRI shapefiles
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Polygon. More...
#include <shp-polygon.h>
Public Member Functions | |
size_t | shp_polygon_points (const shp_polygon_t *polygon, size_t part_num, size_t *start, size_t *end) |
Get the points that form a part. More... | |
void | shp_polygon_point (const shp_polygon_t *polygon, size_t point_num, shp_point_t *point) |
Get a Point. More... | |
A polygon 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. See the "ESRI Shapefile Technical Description" [2] for more information.
size_t shp_polygon_points | ( | const shp_polygon_t * | polygon, |
size_t | part_num, | ||
size_t * | start, | ||
size_t * | end | ||
) |
Gets the indices for the points specified by part_num
.
polygon | a polygon. | |
part_num | a zero-based part number. | |
[out] | start | the range start. |
[out] | end | the range end (exclusive). |
void shp_polygon_point | ( | const shp_polygon_t * | polygon, |
size_t | point_num, | ||
shp_point_t * | point | ||
) |
Gets a Point that belongs to the edges of a Polygon.
Example
polygon | a polygon. | |
point_num | a zero-based point number. | |
[out] | point | a shp_point_t structure. |