calcHeadingAlongRouteSegment.h File Reference

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Functions
DT_DLL_vrfmodel double	DtCalculateHeadingAlongRouteSegment (const DtVector &localTestPoint, const DtVector &localRouteSegmentStart, const DtVector &localRouteSegmentEnd, const Coordinate_System &coordinateSystem, double offsetFromRouteSegment=0.0, double minCorrectionDistance=0.1, double maxCorrectionDistance=8.0, double maxCorrectionAngle=0.5236)
	Calculates the heading for a given test point to direct it along a route segment.

Detailed Description

Function Documentation

DT_DLL_vrfmodel double DtCalculateHeadingAlongRouteSegment	(	const DtVector &	localTestPoint,
		const DtVector &	localRouteSegmentStart,
		const DtVector &	localRouteSegmentEnd,
		const Coordinate_System &	coordinateSystem,
		double	offsetFromRouteSegment = 0.0,
		double	minCorrectionDistance = 0.1,
		double	maxCorrectionDistance = 8.0,
		double	maxCorrectionAngle = 0.5236
	)

Calculates the heading for a given test point to direct it along a route segment.

It finds a heading that attempts to both direct a given point toward the endpoint of a route segment and keep the point close to the segment at the same time. Called periodically in the context of moving along a route or attempting to stay in lane while traveling along a road feature.

Returns

Heading in radians.

Parameters

localTestPoint	Point from which we want to find the appropriate heading to move toward the endpoint of the route segment. In local (database) coordinates.
localRouteSegmentStart	Starting point of route segment in local coordinates.
localRouteSegmentEnd	End point of route segment in local coordinates. This is the goal we are heading toward.
coordinateSystem	Coordinate system that local coordinates are given in.
offsetFromRouteSegment	Signed offset from route segment that we would like to maintain when moving along segment. Positive value indicates offset to right as you look down the segment from the starting point to the end point. Negative value indicates an offset to the left. In meters.
minCorrectionDistance	Minimum distance threshold below which we will not attempt to correct heading to pull point on to the route segment.
maxCorrectionDistance	Maximum distance threshold above which we will not attempt to correct heading to pull point on to the route segment.
maxCorrectionAngle	Absolute value of the maximum amount of angular correction we will make to pull the point in toward the route segment. In radians (default = 30 degrees).