Package org.djutils.draw.curve

Interface Curve2d

All Superinterfaces:

Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>, Flattener.FlattableCurve<Point2d,Double>

All Known Subinterfaces:

OffsetCurve2d

All Known Implementing Classes:

Arc2d, Bezier2d, BezierCubic2d, Clothoid2d, Straight2d

public interface Curve2d
extends Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>, Flattener.FlattableCurve<Point2d,Double>

This interface narrows down the interface of continuous curves for 2d use.

Copyright (c) 2023-2025 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Author:

Alexander Verbraeck, Peter Knoppers, Wouter Schakel

Method Summary

Modifier and Type	Method	Description
default Double	getDirection(double fraction)	Returns the direction at the given fraction.
default Double	getEndDirection()	End direction of this Curve.
default DirectedPoint2d	getEndPoint()	End point of this Curve.
default Double	getStartDirection()	Start direction of this Curve.
default DirectedPoint2d	getStartPoint()	Start point of this Curve.

Methods inherited from interface org.djutils.draw.curve.Curve

getKnots, getLength, getPoint, toPolyLine

Methods inherited from interface org.djutils.draw.curve.Flattener.FlattableCurve

getPoint

Method Details

getStartPoint

default DirectedPoint2d getStartPoint()

Description copied from interface: Curve

Start point of this Curve.

Specified by:

getStartPoint in interface Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>

Returns:

start point of this Curve

getEndPoint

default DirectedPoint2d getEndPoint()

Description copied from interface: Curve

End point of this Curve.

Specified by:

getEndPoint in interface Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>

Returns:

end point of this Curve

getStartDirection

default Double getStartDirection()

Description copied from interface: Curve

Start direction of this Curve.

Specified by:

getStartDirection in interface Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>

Returns:

start direction of this Curve

getEndDirection

default Double getEndDirection()

Description copied from interface: Curve

End direction of this Curve.

Specified by:

getEndDirection in interface Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>

Returns:

end direction of this Curve

getDirection

default Double getDirection(double fraction)

Description copied from interface: Curve

Returns the direction at the given fraction. The fraction may represent any parameter, such as t in a Bézier curve, s in a Clothoid, or simply the fraction of length. The default implementation performs a numerical approach by looking at the direction between the points at fraction, and a point 1e-6 away.

Specified by:

getDirection in interface Curve<DirectedPoint2d,Double,Point2d,Flattener2d,PolyLine2d>

Specified by:

getDirection in interface Flattener.FlattableCurve<Point2d,Double>

Parameters:

fraction - the fraction

Returns:

the direction at the given fraction