edu.virginia.cs.mng.hypercast.DT
Class DT_DoublePoint

java.lang.Object
  |
  +--edu.virginia.cs.mng.hypercast.DT.DT_DoublePoint

public class DT_DoublePoint

extends java.lang.Object

This class represents a point in two dimensions, where the coordinates of the point are doubles. It is used for increased accuracy over DT_Point. It is immutable.

Field Summary

static double	EPSILON The error used in the function equals()
protected double	x
protected double	y

Constructor Summary

DT_DoublePoint(double xx, double yy)

DT_DoublePoint(DT_DoublePoint p)

DT_DoublePoint(DT_Point p)

Method Summary

static double	distance(DT_DoublePoint a, DT_DoublePoint b) Returns the Euclidean distance between two points.
boolean	equals(java.lang.Object o) Compares this to either a DT_DoublePoint or a DT_Point.
static DT_DoublePoint	findInterceptOfLines(double f, double s, double g, double t) Returns the point at the interception of two lines.
double	getX()
double	getY()
int	hashCode() Override to Object.hashCode() so that this object can be used as a key in a hashtable.

Methods inherited from class java.lang.Object

, clone, finalize, getClass, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

EPSILON

public static double EPSILON

The error used in the function equals()

x

protected double x

y

protected double y

Constructor Detail

DT_DoublePoint

public DT_DoublePoint(DT_DoublePoint p)

DT_DoublePoint

public DT_DoublePoint(DT_Point p)

DT_DoublePoint

public DT_DoublePoint(double xx,
                      double yy)

Method Detail

equals

public boolean equals(java.lang.Object o)

Compares this to either a DT_DoublePoint or a DT_Point.

Overrides:

equals in class java.lang.Object

See Also:

EPSILON

hashCode

public int hashCode()

Override to Object.hashCode() so that this object can be used as a key in a hashtable.

Overrides:

hashCode in class java.lang.Object

getX

public double getX()

getY

public double getY()

distance

public static double distance(DT_DoublePoint a,
                              DT_DoublePoint b)

Returns the Euclidean distance between two points.

findInterceptOfLines

public static DT_DoublePoint findInterceptOfLines(double f,
                                                  double s,
                                                  double g,
                                                  double t)

Returns the point at the interception of two lines. (f,s) and (g,t) are the x-intercept and slopes of two lines.

x = (g-f)/(s-t);

y = f + s*x;

Throws:

ArithmeticException - if s == t