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/*
* $RCSfile$
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision$
* $Date$
* $State$
*/
package javax.vecmath;
import java.lang.Math;
/**
* A 2-element vector that is represented by double-precision floating
* point x,y coordinates.
*
*/
public class Vector2d extends Tuple2d implements java.io.Serializable {
// Combatible with 1.1
static final long serialVersionUID = 8572646365302599857L;
/**
* Constructs and initializes a Vector2d from the specified xy coordinates.
* @param x the x coordinate
* @param y the y coordinate
*/
public Vector2d(double x, double y)
{
super(x,y);
}
/**
* Constructs and initializes a Vector2d from the specified array.
* @param v the array of length 2 containing xy in order
*/
public Vector2d(double[] v)
{
super(v);
}
/**
* Constructs and initializes a Vector2d from the specified Vector2d.
* @param v1 the Vector2d containing the initialization x y data
*/
public Vector2d(Vector2d v1)
{
super(v1);
}
/**
* Constructs and initializes a Vector2d from the specified Vector2f.
* @param v1 the Vector2f containing the initialization x y data
*/
public Vector2d(Vector2f v1)
{
super(v1);
}
/**
* Constructs and initializes a Vector2d from the specified Tuple2d.
* @param t1 the Tuple2d containing the initialization x y data
*/
public Vector2d(Tuple2d t1)
{
super(t1);
}
/**
* Constructs and initializes a Vector2d from the specified Tuple2f.
* @param t1 the Tuple2f containing the initialization x y data
*/
public Vector2d(Tuple2f t1)
{
super(t1);
}
/**
* Constructs and initializes a Vector2d to (0,0).
*/
public Vector2d()
{
super();
}
/**
* Computes the dot product of the this vector and vector v1.
* @param v1 the other vector
*/
public final double dot(Vector2d v1)
{
return (this.x*v1.x + this.y*v1.y);
}
/**
* Returns the length of this vector.
* @return the length of this vector
*/
public final double length()
{
return (double) Math.sqrt(this.x*this.x + this.y*this.y);
}
/**
* Returns the squared length of this vector.
* @return the squared length of this vector
*/
public final double lengthSquared()
{
return (this.x*this.x + this.y*this.y);
}
/**
* Sets the value of this vector to the normalization of vector v1.
* @param v1 the un-normalized vector
*/
public final void normalize(Vector2d v1)
{
double norm;
norm = (double) (1.0/Math.sqrt(v1.x*v1.x + v1.y*v1.y));
this.x = v1.x*norm;
this.y = v1.y*norm;
}
/**
* Normalizes this vector in place.
*/
public final void normalize()
{
double norm;
norm = (double)
(1.0/Math.sqrt(this.x*this.x + this.y*this.y));
this.x *= norm;
this.y *= norm;
}
/**
* Returns the angle in radians between this vector and the vector
* parameter; the return value is constrained to the range [0,PI].
* @param v1 the other vector
* @return the angle in radians in the range [0,PI]
*/
public final double angle(Vector2d v1)
{
double vDot = this.dot(v1) / ( this.length()*v1.length() );
if( vDot < -1.0) vDot = -1.0;
if( vDot > 1.0) vDot = 1.0;
return((double) (Math.acos( vDot )));
}
}
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