com.luciad.ais.geodesy

Aviation StandardsClass TLcdEllipsoidIntersectionUtil

java.lang.Object

com.luciad.ais.geodesy.TLcdEllipsoidIntersectionUtil

public class TLcdEllipsoidIntersectionUtil
extends Object

Utility class to calculate intersection points on the ellipsoid earth surface.

Constructor Summary

Constructors

Constructor and Description
TLcdEllipsoidIntersectionUtil()

Method Summary

Modifier and Type	Method and Description
double	getClosestPointOnArcSegment(ILcdEllipsoid aEllipsoid, ILcdPoint aP1, double aAzimuth, ILcdPoint aCenter, double aRadius, double aStartAngle, double aArcAngle, ILcd2DEditablePoint aResultSFCT) Returns the forward azimuth direction of the shortest distance path between a point and an elliptical arc segment.
int	intersection2DGeodesicLineWithArcSegment(ILcdPoint aP1, ILcdPoint aP2, ILcdArc aArc, ILcdEllipsoid aEllipsoid, double aRelativeTolerance, double aAbsoluteTolerance, ILcd2DEditablePoint aResultSFCT1, ILcd2DEditablePoint aResultSFCT2) Returns the number of intersection points between an elliptical arc and a geodesic line defined by its start point and a direction.
int	intersection2DGeodesicLineWithArcSegment(ILcdPoint aP1, ILcdPoint aP2, ILcdPoint aCenter, double aA, double aB, double aRotAngle, double aStartAngle, double aArcAngle, ILcdEllipsoid aEllipsoid, double aRelativeTolerance, double aAbsoluteTolerance, ILcd2DEditablePoint aResultSFCT1, ILcd2DEditablePoint aResultSFCT2) Returns the number of intersection points between an elliptical arc and a geodesic line defined by its start point and a direction.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TLcdEllipsoidIntersectionUtil

public TLcdEllipsoidIntersectionUtil()

Method Detail

intersection2DGeodesicLineWithArcSegment

public int intersection2DGeodesicLineWithArcSegment(ILcdPoint aP1,
                                                    ILcdPoint aP2,
                                                    ILcdArc aArc,
                                                    ILcdEllipsoid aEllipsoid,
                                                    double aRelativeTolerance,
                                                    double aAbsoluteTolerance,
                                                    ILcd2DEditablePoint aResultSFCT1,
                                                    ILcd2DEditablePoint aResultSFCT2)

Returns the number of intersection points between an elliptical arc and a geodesic line defined by its start point and a direction.

Parameters:

aP1 - start point of the geodesic line.

aP2 - end point of the geodesic line.

aArc - arc segment to find the intersection with.

aEllipsoid - the ellipsoid to work on.

aRelativeTolerance - a relative tolerance (with relation to distance between aP1-aP2).

aAbsoluteTolerance - a absolute tolerance.

aResultSFCT1 - first intersection point as side effect.

aResultSFCT2 - second intersection point as side effect.

Returns:

the number of intersection points. If 0 there are none and the side effect parameters should not be used. If 1 the first side effect parameters contains the intersection point. If 2 both side effect parameters contain intersection points.

intersection2DGeodesicLineWithArcSegment

public final int intersection2DGeodesicLineWithArcSegment(ILcdPoint aP1,
                                                          ILcdPoint aP2,
                                                          ILcdPoint aCenter,
                                                          double aA,
                                                          double aB,
                                                          double aRotAngle,
                                                          double aStartAngle,
                                                          double aArcAngle,
                                                          ILcdEllipsoid aEllipsoid,
                                                          double aRelativeTolerance,
                                                          double aAbsoluteTolerance,
                                                          ILcd2DEditablePoint aResultSFCT1,
                                                          ILcd2DEditablePoint aResultSFCT2)

Returns the number of intersection points between an elliptical arc and a geodesic line defined by its start point and a direction.

Parameters:

aP1 - start point of the geodesic line.

aP2 - end point of the geodesic line.

aCenter - center point of the elliptical arc segment.

aA - semi-major axis (expressed in meters).

aB - semi-minor axis (expressed in meters).

aRotAngle - the rotation angle of the major axis (in degrees). The angle is measured from 3 o'clock position, positive counter-clockwise.

aStartAngle - the start angle of the arc (in degrees). The angle is measured from 3 o'clock position, positive counter-clockwise.

aArcAngle - the angle over which the arc extends (in degrees). The angle is positive counter-clockwise.

aEllipsoid - the ellipsoid to work on.

aRelativeTolerance - a relative tolerance (relative to distance between aP1-aP2).

aAbsoluteTolerance - a absolute tolerance.

aResultSFCT1 - first intersection point as side effect.

aResultSFCT2 - second intersection point as side effect.

Returns:

the number of intersection points. If 0 there are none and the side effect parameters should not be used. If 1 the first side effect parameters contains the intersection point. If 2 both side effect parameters contain intersection points.

getClosestPointOnArcSegment

public double getClosestPointOnArcSegment(ILcdEllipsoid aEllipsoid,
                                          ILcdPoint aP1,
                                          double aAzimuth,
                                          ILcdPoint aCenter,
                                          double aRadius,
                                          double aStartAngle,
                                          double aArcAngle,
                                          ILcd2DEditablePoint aResultSFCT)

Returns the forward azimuth direction of the shortest distance path between a point and an elliptical arc segment.

Parameters:

aEllipsoid - the ellipsoid to work on.

aP1 - the point from which the distance must be calculated.

aAzimuth - the initial azimuth to be used for finding the shortest distance path.

aCenter - the center point of the elliptical arc segment.

aRadius - the radius of the arc.

aStartAngle - the start angle of the arc (in degrees). The angle is measured from 3 o'clock position, positive counter-clockwise.

aArcAngle - the angle over which the arc extends (in degrees). The angle is positive counter-clockwise.

aResultSFCT - the closest point on the elliptical arc segment as side effect.

Returns:

the forward azimuth direction of the shortest distance path between a point and an elliptical arc segment.