Intersection Functions

Functions
GEOMLIBEXPORT void	IntsClean (INTSHANDLE ihp, DPOLYGON *dpoly, INTERSECTINFO *ints)
GEOMLIBEXPORT void	IntsFree (INTERSECTINFO *ints)
GEOMLIBEXPORT int	IntsInit (double thresh, INTSHANDLE *ihp)
GEOMLIBEXPORT int	IntsSearch (INTSHANDLE ihp, DPOLYGON *checkpoly, DPOLYGON *otherpoly, INTERSECTINFO *checkints, INTERSECTINFO *otherints)
GEOMLIBEXPORT int	IntsSplitLine (INTSHANDLE ihp, DPOLYGON *dpoly, INTERSECTINFO *ints, int(*)(void *, DPOLYGON *), int(*)(void *), void *udata)
GEOMLIBEXPORT void	IntsStop (INTSHANDLE ihp)

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Function Documentation

GEOMLIBEXPORT void IntsClean (  INTSHANDLE  ihp, DPOLYGON *  dpoly, INTERSECTINFO *  ints )

Sort and remove duplicates from INTERSECTINFO structure. This function removes duplicate and/or overlapping intersections associated with the line. It also sorts the data for use in IntsSplitLine(). Parameters: ihp  Intersection handle, see IntsInit() dpoly  Polygon associated with INTERSECTINFO ints  Structure to clean up

GEOMLIBEXPORT void IntsFree (  INTERSECTINFO *  ints  )

Free allocated memory from an INTERSECTINFO structure. Internal pointers get allocated during the IntsSearch() and IntsSearchSelf() functions. This will free them up. Parameters: ints  Structure that contains allocated memory

GEOMLIBEXPORT int IntsInit (  double  thresh, INTSHANDLE *  ihp )

Initialize intersect searching code. Parameters: thresh  Threshold to remove duplicate points in calls to RemoveDupPtsT(). ihp  Intersection handle RETURNED

GEOMLIBEXPORT int IntsSearch (  INTSHANDLE  ihp, DPOLYGON *  checkpoly, DPOLYGON *  otherpoly, INTERSECTINFO *  checkints, INTERSECTINFO *  otherints )

Search for intersections between two lines. This function determines if the two lines cross or overlap each other and stores where into the respective INTERSECTINFO structure. This function will append to the INTERSECTINFO structure if intersection data exists for that line. Parameters: ihp  Intersection handle, see IntsInit() checkpoly  Source line to search for intersections on otherpoly  Other line to search for intersections on checkints  Structure to store intersection data in for source line otherints  Structure to store intersection data in for other line (may be NULL)

GEOMLIBEXPORT int IntsSplitLine (  INTSHANDLE  ihp, DPOLYGON *  dpoly, INTERSECTINFO *  ints, int(*  )(void *, DPOLYGON *), int(*  )(void *), void *  udata )

Split up a line according to the data in the INSTERSECTINFO structure. Parameters: ihp  Intersection handle, see IntsInit() dpoly  Line to split ints  Information on how to split the line udata  Callback if line is completely overlapped and cannot be added, see IntsSplitLineEx User data to be passed to callbacks

GEOMLIBEXPORT void IntsStop (  INTSHANDLE  ihp  )

Clean up intersect searching code. Parameters: ihp  Intersection handle, see IntsInit()

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