EnterLeave.sql File Reference

The file implements the enter-leave functions of the SegmentSP object. More...

Functions
void	enter_leave (segmentst[] traj, boxsp box_area, pointst enterpoint, pointst leavepoint)
	The enter leave function finds the points where the object entered or left a specific region. It takes an array of segments and a box as parameters. The function returns two columns one for the enter and one for the leave point. If one of them doesn’t exist then it returns NULL to the corresponding column. More...

Detailed Description

The file implements the enter-leave functions of the SegmentSP object.

Author

Marios Vodas (mvoda.nosp@m.s@gm.nosp@m.ail.c.nosp@m.om).

See also

Object methods

Enter-leave points

Function Documentation

void enter_leave	(	segmentst[]	traj,
		boxsp	box_area,
		pointst	enterpoint,
		pointst	leavepoint
	)

The enter leave function finds the points where the object entered or left a specific region. It takes an array of segments and a box as parameters. The function returns two columns one for the enter and one for the leave point. If one of them doesn’t exist then it returns NULL to the corresponding column.

Parameters

[in]	traj	the array of segment
[in]	box	the box

Returns

the points where the object entered or left a specific region

See also

Enter-leave points