--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/geometry/Ray.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,190 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.draw2d.geometry.Ray;
+
+import dwt.dwthelper.utils;
+import tango.text.convert.Format;
+
+import dwtx.draw2d.geometry.Point;
+
+
+/**
+ * Represents a 2-dimensional directional Vector, or Ray. {@link java.util.Vector} is
+ * commonly imported, so the name Ray was chosen.
+ */
+public final class Ray {
+
+/** the X value */
+public int x;
+/** the Y value*/
+public int y;
+
+/**
+ * Constructs a Ray &lt;0, 0&gt; with no direction and magnitude.
+ * @since 2.0
+ */
+public this() { }
+
+/**
+ * Constructs a Ray pointed in the specified direction.
+ *
+ * @param x  X value.
+ * @param y  Y value.
+ * @since 2.0
+ */
+public this(int x, int y) {
+    this.x = x;
+    this.y = y;
+}
+
+/**
+ * Constructs a Ray pointed in the direction specified by a Point.
+ * @param p the Point
+ * @since 2.0
+ */
+public this(Point p) {
+    x = p.x; y = p.y;
+}
+
+/**
+ * Constructs a Ray representing the direction and magnitude between to provided Points.
+ * @param start Strarting Point
+ * @param end End Point
+ * @since 2.0
+ */
+public this(Point start, Point end) {
+    x = end.x - start.x;
+    y = end.y - start.y;
+}
+
+/**
+ * Constructs a Ray representing the difference between two provided Rays.
+ * @param start  The start Ray
+ * @param end   The end Ray
+ * @since 2.0
+ */
+public this(Ray start, Ray end) {
+    x = end.x - start.x;
+    y = end.y - start.y;
+}
+
+/**
+ * Calculates the magnitude of the cross product of this Ray with another.
+ * Represents the amount by which two Rays are directionally different.
+ * Parallel Rays return a value of 0.
+ * @param r  Ray being compared
+ * @return  The assimilarity
+ * @see #similarity(Ray)
+ * @since 2.0
+ */
+public int assimilarity(Ray r) {
+    return Math.abs(x * r.y - y * r.x);
+}
+
+/**
+ * Calculates the dot product of this Ray with another.
+ * @param r the Ray used to perform the dot product
+ * @return The dot product
+ * @since 2.0
+ */
+public int dotProduct(Ray r) {
+    return x * r.x + y * r.y;
+}
+
+/**
+ * @see java.lang.Object#equals(Object)
+ */
+public override int opEquals(Object obj) {
+    if (obj is this)
+        return true;
+    if ( auto r = cast(Ray)obj ) {
+        return x is r.x && y is r.y;
+    }
+    return false;
+}
+
+/**
+ * Creates a new Ray which is the sum of this Ray with another.
+ * @param r  Ray to be added with this Ray
+ * @return  a new Ray
+ * @since 2.0
+ */
+public Ray getAdded(Ray r) {
+    return new Ray(r.x + x, r.y + y);
+}
+
+/**
+ * Creates a new Ray which represents the average of this Ray with another.
+ * @param r  Ray to calculate the average.
+ * @return  a new Ray
+ * @since 2.0
+ */
+public Ray getAveraged(Ray r) {
+    return new Ray ((x + r.x) / 2, (y + r.y) / 2);
+}
+
+/**
+ * Creates a new Ray which represents this Ray scaled by the amount provided.
+ * @param s  Value providing the amount to scale.
+ * @return  a new Ray
+ * @since 2.0
+ */
+public Ray getScaled(int s) {
+    return new Ray(x * s, y * s);
+}
+
+/**
+ * @see java.lang.Object#toHash()
+ */
+public override hash_t toHash() {
+    return (x * y) ^ (x + y);
+}
+
+/**
+ * Returns true if this Ray has a non-zero horizontal comonent.
+ * @return  true if this Ray has a non-zero horizontal comonent
+ * @since 2.0
+ */
+public bool isHorizontal() {
+    return x !is 0;
+}
+
+/**
+ * Returns the length of this Ray.
+ * @return  Length of this Ray
+ * @since 2.0
+ */
+public double length() {
+    return Math.sqrt(cast(real)dotProduct(this));
+}
+
+/**
+ * Calculates the similarity of this Ray with another.
+ * Similarity is defined as the absolute value of the dotProduct()
+ * @param r  Ray being tested for similarity
+ * @return  the Similarity
+ * @see #assimilarity(Ray)
+ * @since 2.0
+ */
+public int similarity(Ray r) {
+    return Math.abs(dotProduct(r));
+}
+
+/**
+ * @return a String representation
+ */
+public String toString() {
+    return Format("({}, {})", x, y );//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
+}
+
+}