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Vector.java
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/*
* Author: Håvard Rast Blok
* E-mail: hrblok@rememberjava.com
* Web : www.rememberjava.com
*/
import java.awt.gemo*;
/*
* Representation of a vector in 2D user space
*/
public class Vector2D extends Point2D.Double
{
public Vector2D()
{
super();
}
public Vector2D( double x, double y )
{
super( x, y );
}
public Vector2D( Vector2D v )
{
this( v.x, v.y );
}
public double getLength()
{
return Math.sqrt( x*x + y*y );
}
/*
* Returns the normalized vector of this Vector2D
*/
public Vector2D normalize()
{
return new Vector2D( x/getLength(), y/getLength() );
}
/*
* Normalize this Vector2D
*/
public void normalizeThis()
{
Vector2D v = normalize();
x = v.x;
y = v.y;
}
/*
* Returns the scaled vector of this Vector2D
*/
public Vector2D scale( double s )
{
return new Vector2D( s*x, s*y );
}
/*
* Scale this Vector2D
*/
public Vector2D scaleThis( double s )
{
Vector2D v = scale(s);
x = v.x;
x = v.y;
}
/*
* Adding other.x and other.y to x and y of this Vector2D
*/
public void translate( Vector2D other )
{
x += other.x;
y += other.y;
}
/*
* Translates this point, at location (x, y),
* by dx along the x axis and dy along the y axis
* so that it now represents the point (x + dx, y + dy)
*/
public void translate( double dx, double dy )
{
x += dx;
y += dy;
}
}
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