Package oracle.spatial.geometry

Class CompJGeom

java.lang.Object

oracle.spatial.geometry.CompJGeom

public class CompJGeom
extends java.lang.Object

Since:

release specific (what release of product did this appear in)

Constructor Summary

Constructors

Constructor	Description
CompJGeom()

Method Summary

Modifier and Type	Method	Description
static double	distLineToLine(JPoint2DD p1, JPoint2DD p2, JPoint2DD q1, JPoint2DD q2, CoordSysInfo CSI)	Compute the distance from a line to a line.
static double	distToLine(double px, double py, double q1x, double q1y, double q2x, double q2y)	Finds the planar closest distance from a point to a line segment.
static double	distToLine(JPoint2DD pt, JPoint2DD q1, JPoint2DD q2, CoordSysInfo CSI)	Compute the distance from a point to a line.
static double	distToPoint(double q1x, double q1y, double q2x, double q2y)	Finds the planar closest distance from a point to a point.
static double	distToPoint(JPoint2DD p1, JPoint2DD p2, CoordSysInfo CSI)	Compute the distance from a point to a line.
static double	isInsideCheck(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDcl(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDclcl(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDcurv(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDistance(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDlinecurve(JPoint2DD[] line1, JGeometry geom, CoordSysInfo CSI)
static double	jmdDlinepolygon(JPoint2DD[] line1, JGeometry geom, CoordSysInfo CSI)
static double	jmdDpg(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDpgpg(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDpnt(JGeometry geom1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDpntcurve(JPoint2DD p1, JGeometry geom2, CoordSysInfo CSI)
static double	jmdDpntpolygon(JPoint2DD point, JGeometry geom, CoordSysInfo CSI)
protected static double	jMdspheedis(double x1, double y1, double x2, double y2, double smax, double iflat)	The method jMdspheedis computes the precise ellipsoidal distance using long/lat of two points.
static boolean	lineLineIntersect(double a1x, double a1y, double a2x, double a2y, double b1x, double b1y, double b2x, double b2y, double[] c)	Finds the open-set intersection of two line segments, if any.
static double	MBRDistance(double[] mbrA, double[] mbrB, CoordSysInfo CSI)
static boolean	MBRIscts(double[] mbrA, double[] mbrB, CoordSysInfo CSI)

Methods inherited from class java.lang.Object

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

Constructor Detail

CompJGeom

public CompJGeom()

Method Detail

lineLineIntersect

public static final boolean lineLineIntersect(double a1x,
                                              double a1y,
                                              double a2x,
                                              double a2y,
                                              double b1x,
                                              double b1y,
                                              double b2x,
                                              double b2y,
                                              double[] c)

Finds the open-set intersection of two line segments, if any.

Returns false ("no intersection") if the lines are nearly parallel (regardless of whether they cross).

If the end-point of a segment lies very near to the other segment, intersection test is not reliable; the caller should test the point-on-line case separately. If the endpoint lies exactly on an endpoint of the other segment this method guarantees to return false.

Parameters:

a1x - the first endpoint x-value of line segment a

a1y - the first endpoint y-value of line segment a

a2x - the first endpoint x-value of line segment a

a2y - the first endpoint y-value of line segment a

b1x - the first endpoint x-value of line segment b

b1y - the first endpoint y-value of line segment b

b2x - the first endpoint x-value of line segment b

b2y - the first endpoint y-value of line segment a

c - the intersection (if any). May pass null. If non-null, may be overwritten even if result is false.

Returns:

true if there is an intersection; false otherwise

distToPoint

public static final double distToPoint(JPoint2DD p1,
                                       JPoint2DD p2,
                                       CoordSysInfo CSI)

Compute the distance from a point to a line. Geodetic computations assume a sphere. All input is in degrees.

Parameters:

p1 - the point

p2 - other end of the line

CSI - coordinate system

Returns:

distance in coordiante system units (meters if geodetic)

distToLine

public static final double distToLine(JPoint2DD pt,
                                      JPoint2DD q1,
                                      JPoint2DD q2,
                                      CoordSysInfo CSI)

Compute the distance from a point to a line. Geodetic computations assume a sphere. All input is in degrees.

Parameters:

pt - the point

q1 - one end of the line

q2 - other end of the line

CSI - coordinate system

Returns:

distance in coordiante system units (meters if geodetic)

distLineToLine

public static final double distLineToLine(JPoint2DD p1,
                                          JPoint2DD p2,
                                          JPoint2DD q1,
                                          JPoint2DD q2,
                                          CoordSysInfo CSI)

Compute the distance from a line to a line. Geodetic computations assume a sphere. All input is in degrees.

Parameters:

pt1 - one end of the line

pt2 - other end of the line

q1 - one end of the line

q2 - other end of the line

CSI - coordinate system

Returns:

distance in coordiante system units (meters if geodetic)

distToPoint

public static final double distToPoint(double q1x,
                                       double q1y,
                                       double q2x,
                                       double q2y)

Finds the planar closest distance from a point to a point.

Parameters:

p1 - The first point

p2 - The second point

distToLine

public static final double distToLine(double px,
                                      double py,
                                      double q1x,
                                      double q1y,
                                      double q2x,
                                      double q2y)

Finds the planar closest distance from a point to a line segment.

Parameters:

p - The point

q1 - The first vertex of the line segment

q2 - The second vertex of the line segment

Returns:

The distance in coordinate system units

jMdspheedis

protected static double jMdspheedis(double x1,
                                    double y1,
                                    double x2,
                                    double y2,
                                    double smax,
                                    double iflat)

The method jMdspheedis computes the precise ellipsoidal distance using long/lat of two points. It is the Java version of mdspheedis function in mdsph.c Original function by Author: B. Blackwell from mdsph.c

Input is geodetic longitude, latitude in radians of two points on earth spheroid.

Based on Mathematica Geodesy package by John Novak

Will return 0. for arcs of the order of a meter or less. For very short arcs use mdsphedis(). Will return the antipodal distance for points which are very close to antipodal.

Accuracy is of order 1e-9.

Parameters:

x1 - longitude of first point in radians

y1 - latitude of first point in radians

x2 - longitude of second point in radians

y2 - latitude of second point in radians

smax - smax of ellipsoid

iflat - inverse flattening

Returns:

ellipsoid distance in meters.

jmdDistance

public static double jmdDistance(JGeometry geom1,
                                 JGeometry geom2,
                                 CoordSysInfo CSI)

jmdDpnt

public static double jmdDpnt(JGeometry geom1,
                             JGeometry geom2,
                             CoordSysInfo CSI)

jmdDcurv

public static double jmdDcurv(JGeometry geom1,
                              JGeometry geom2,
                              CoordSysInfo CSI)

jmdDpntcurve

public static double jmdDpntcurve(JPoint2DD p1,
                                  JGeometry geom2,
                                  CoordSysInfo CSI)

jmdDlinecurve

public static double jmdDlinecurve(JPoint2DD[] line1,
                                   JGeometry geom,
                                   CoordSysInfo CSI)

jmdDlinepolygon

public static double jmdDlinepolygon(JPoint2DD[] line1,
                                     JGeometry geom,
                                     CoordSysInfo CSI)

jmdDpntpolygon

public static double jmdDpntpolygon(JPoint2DD point,
                                    JGeometry geom,
                                    CoordSysInfo CSI)

jmdDpg

public static double jmdDpg(JGeometry geom1,
                            JGeometry geom2,
                            CoordSysInfo CSI)

jmdDpgpg

public static double jmdDpgpg(JGeometry geom1,
                              JGeometry geom2,
                              CoordSysInfo CSI)

jmdDcl

public static double jmdDcl(JGeometry geom1,
                            JGeometry geom2,
                            CoordSysInfo CSI)

jmdDclcl

public static double jmdDclcl(JGeometry geom1,
                              JGeometry geom2,
                              CoordSysInfo CSI)

MBRIscts

public static boolean MBRIscts(double[] mbrA,
                               double[] mbrB,
                               CoordSysInfo CSI)

MBRDistance

public static double MBRDistance(double[] mbrA,
                                 double[] mbrB,
                                 CoordSysInfo CSI)

isInsideCheck

public static double isInsideCheck(JGeometry geom1,
                                   JGeometry geom2,
                                   CoordSysInfo CSI)