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+/*
+ * $RCSfile$
+ *
+ * Copyright (c) 2004 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 double-precision floating point
+ * x,y,z,w coordinates.
+ *
+ */
+public class Vector4d extends Tuple4d implements java.io.Serializable {
+
+ // Compatible with 1.1
+ static final long serialVersionUID = 3938123424117448700L;
+
+ /**
+ * Constructs and initializes a Vector4d 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 Vector4d(double x, double y, double z, double w)
+ {
+ super(x,y,z,w);
+ }
+
+ /**
+ * Constructs and initializes a Vector4d from the coordinates contained
+ * in the array.
+ * @param v the array of length 4 containing xyzw in order
+ */
+ public Vector4d(double[] v)
+ {
+ super(v);
+ }
+
+ /**
+ * Constructs and initializes a Vector4d from the specified Vector4d.
+ * @param v1 the Vector4d containing the initialization x y z w data
+ */
+ public Vector4d(Vector4d v1)
+ {
+ super(v1);
+ }
+
+ /**
+ * Constructs and initializes a Vector4d from the specified Vector4f.
+ * @param v1 the Vector4f containing the initialization x y z w data
+ */
+ public Vector4d(Vector4f v1)
+ {
+ super(v1);
+ }
+
+ /**
+ * Constructs and initializes a Vector4d from the specified Tuple4f.
+ * @param t1 the Tuple4f containing the initialization x y z w data
+ */
+ public Vector4d(Tuple4f t1)
+ {
+ super(t1);
+ }
+
+ /**
+ * Constructs and initializes a Vector4d from the specified Tuple4d.
+ * @param t1 the Tuple4d containing the initialization x y z w data
+ */
+ public Vector4d(Tuple4d t1)
+ {
+ super(t1);
+ }
+
+
+ /**
+ * Constructs and initializes a Vector4d from the specified Tuple3d.
+ * 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 Java 3D 1.2
+ */
+ public Vector4d(Tuple3d t1) {
+ super(t1.x, t1.y, t1.z, 0.0);
+ }
+
+
+ /**
+ * Constructs and initializes a Vector4d to (0,0,0,0).
+ */
+ public Vector4d()
+ {
+ 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 Java 3D 1.2
+ */
+ public final void set(Tuple3d t1) {
+ this.x = t1.x;
+ this.y = t1.y;
+ this.z = t1.z;
+ this.w = 0.0;
+ }
+
+
+ /**
+ * Returns the length of this vector.
+ * @return the length of this vector
+ */
+ public final double length()
+ {
+ return 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
+ */
+ public final double 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 vector v1.
+ * @param v1 the other vector
+ * @return the dot product of this vector and vector v1
+ */
+ public final double dot(Vector4d 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(Vector4d v1)
+ {
+ double norm;
+
+ norm = 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()
+ {
+ double norm;
+
+ norm = 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 double angle(Vector4d 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 )));
+ }
+
+}