oracle.spatial.geometry

Class CompJGeom

java.lang.Object

oracle.spatial.geometry.CompJGeom

public final class CompJGeom
extends java.lang.Object

Since:

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

Constructor Summary

Constructors

Constructor and Description
CompJGeom()

Method Summary

Modifier and Type	Method and Description
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 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.

Methods inherited from class java.lang.Object

equals, 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

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)

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