1 files changed, 168 insertions, 0 deletions
diff --git a/src/javax/vecmath/Vector2d.java b/src/javax/vecmath/Vector2d.java
new file mode 100644
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+++ b/src/javax/vecmath/Vector2d.java
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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 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 )));
+
+   }
+
+
+}