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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 4-element vector represented by single-precision floating point x,y,z,w
* coordinates.
*
*/
public class Vector4f extends Tuple4f implements java.io.Serializable {
// Compatible with 1.1
static final long serialVersionUID = 8749319902347760659L;
/**
* Constructs and initializes a Vector4f from the specified xyzw coordinates.
* @param x the x coordinate
* @param y the y coordinate
* @param z the z coordinate
* @param w the w coordinate
*/
public Vector4f(float x, float y, float z, float w)
{
super(x,y,z,w);
}
/**
* Constructs and initializes a Vector4f from the array of length 4.
* @param v the array of length 4 containing xyzw in order
*/
public Vector4f(float[] v)
{
super(v);
}
/**
* Constructs and initializes a Vector4f from the specified Vector4f.
* @param v1 the Vector4f containing the initialization x y z w data
*/
public Vector4f(Vector4f v1)
{
super(v1);
}
/**
* Constructs and initializes a Vector4f from the specified Vector4d.
* @param v1 the Vector4d containing the initialization x y z w data
*/
public Vector4f(Vector4d v1)
{
super(v1);
}
/**
* Constructs and initializes a Vector4f from the specified Tuple4f.
* @param t1 the Tuple4f containing the initialization x y z w data
*/
public Vector4f(Tuple4f t1)
{
super(t1);
}
/**
* Constructs and initializes a Vector4f from the specified Tuple4d.
* @param t1 the Tuple4d containing the initialization x y z w data
*/
public Vector4f(Tuple4d t1)
{
super(t1);
}
/**
* Constructs and initializes a Vector4f from the specified Tuple3f.
* The x,y,z components of this vector are set to the corresponding
* components of tuple t1. The w component of this vector
* is set to 0.
* @param t1 the tuple to be copied
*
* @since vecmath 1.2
*/
public Vector4f(Tuple3f t1) {
super(t1.x, t1.y, t1.z, 0.0f);
}
/**
* Constructs and initializes a Vector4f to (0,0,0,0).
*/
public Vector4f()
{
super();
}
/**
* Sets the x,y,z components of this vector to the corresponding
* components of tuple t1. The w component of this vector
* is set to 0.
* @param t1 the tuple to be copied
*
* @since vecmath 1.2
*/
public final void set(Tuple3f t1) {
this.x = t1.x;
this.y = t1.y;
this.z = t1.z;
this.w = 0.0f;
}
/**
* Returns the length of this vector.
* @return the length of this vector as a float
*/
public final float length()
{
return
(float) Math.sqrt(this.x*this.x + this.y*this.y +
this.z*this.z + this.w*this.w);
}
/**
* Returns the squared length of this vector
* @return the squared length of this vector as a float
*/
public final float lengthSquared()
{
return (this.x*this.x + this.y*this.y +
this.z*this.z + this.w*this.w);
}
/**
* returns the dot product of this vector and v1
* @param v1 the other vector
* @return the dot product of this vector and v1
*/
public final float dot(Vector4f v1)
{
return (this.x*v1.x + this.y*v1.y + this.z*v1.z + this.w*v1.w);
}
/**
* Sets the value of this vector to the normalization of vector v1.
* @param v1 the un-normalized vector
*/
public final void normalize(Vector4f v1)
{
float norm;
norm = (float) (1.0/Math.sqrt(v1.x*v1.x + v1.y*v1.y +
v1.z*v1.z + v1.w*v1.w));
this.x = v1.x*norm;
this.y = v1.y*norm;
this.z = v1.z*norm;
this.w = v1.w*norm;
}
/**
* Normalizes this vector in place.
*/
public final void normalize()
{
float norm;
norm = (float) (1.0/Math.sqrt(this.x*this.x + this.y*this.y +
this.z*this.z + this.w*this.w));
this.x *= norm;
this.y *= norm;
this.z *= norm;
this.w *= norm;
}
/**
* Returns the (4-space) 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 float angle(Vector4f 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((float) (Math.acos( vDot )));
}
}
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