lwiterator.c File Reference

#include "liblwgeom.h"
#include "lwgeom_log.h"

Include dependency graph for lwiterator.c:

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Data Structures
struct	LISTNODE
struct	LWPOINTITERATOR

Typedefs
typedef struct LISTNODE	LISTNODE

Functions
static LISTNODE *	prepend_node (const void *g, LISTNODE *front)
static LISTNODE *	pop_node (LISTNODE *i)
static int	add_lwgeom_to_stack (LWPOINTITERATOR *s, const LWGEOM *g)
static LISTNODE *	extract_pointarrays_from_lwgeom (const LWGEOM *g)
	Return a pointer to the first of one or more LISTNODEs holding the POINTARRAYs of a geometry.
static void	unroll_collection (LWPOINTITERATOR *s)
	Remove an LWCOLLECTION from the iterator stack, and add the components of the LWCOLLECTIONs to the stack.
static void	unroll_collections (LWPOINTITERATOR *s)
	Unroll LWCOLLECTIONs from the top of the stack, as necessary, until the element at the top of the stack is not a LWCOLLECTION.
static int	lwpointiterator_advance (LWPOINTITERATOR *s)
int	lwpointiterator_peek (LWPOINTITERATOR *s, POINT4D *p)
	Attempts to assigns the next point in the iterator to p.
int	lwpointiterator_has_next (LWPOINTITERATOR *s)
	Returns LW_TRUE if there is another point available in the iterator.
int	lwpointiterator_next (LWPOINTITERATOR *s, POINT4D *p)
	Attempts to assign the next point in the iterator to p, and advances the iterator to the next point.
int	lwpointiterator_modify_next (LWPOINTITERATOR *s, const POINT4D *p)
	Attempts to replace the next point int the iterator with p, and advances the iterator to the next point.
LWPOINTITERATOR *	lwpointiterator_create (const LWGEOM *g)
	Create a new LWPOINTITERATOR over supplied LWGEOM*.
LWPOINTITERATOR *	lwpointiterator_create_rw (LWGEOM *g)
	Create a new LWPOINTITERATOR over supplied LWGEOM* Supports modification of coordinates during iteration.
void	lwpointiterator_destroy (LWPOINTITERATOR *s)
	Free all memory associated with the iterator.