pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / spatial / src / java / org / apache / lucene / spatial / geometry / shape / Vector2D.java

diff --git a/lucene-java-3.5.0/lucene/contrib/spatial/src/java/org/apache/lucene/spatial/geometry/shape/Vector2D.java b/lucene-java-3.5.0/lucene/contrib/spatial/src/java/org/apache/lucene/spatial/geometry/shape/Vector2D.java
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+++ b/lucene-java-3.5.0/lucene/contrib/spatial/src/java/org/apache/lucene/spatial/geometry/shape/Vector2D.java
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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.lucene.spatial.geometry.shape;
+
+
+/**
+ * 2D vector
+ *
+ * <p><font color="red"><b>NOTE:</b> This API is still in
+ * flux and might change in incompatible ways in the next
+ * release.</font>
+ */
+public class Vector2D {
+  private double x;
+  private double y;
+
+  /**
+   * Create a vector from the origin of the coordinate system to the given
+   * point
+   * 
+   * @param x
+   * @param y
+   */
+  public Vector2D(double x, double y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  /**
+   * Create a vector from the origin of the coordinate system to the given
+   * point
+   */
+  public Vector2D(Point2D p) {
+    this(p.getX(), p.getY());
+  }
+
+  /**
+   * Create a vector from one point to another
+   * 
+   * @param from
+   * @param to
+   */
+  public Vector2D(Point2D from, Point2D to) {
+    this(to.getX() - from.getX(), to.getY() - from.getY());
+  }
+
+  public Vector2D() {
+    this.x = 0;
+    this.y = 0;
+  }
+
+  public Vector2D(Vector2D other) {
+    this.x = other.x;
+    this.y = other.y;
+  }
+
+  public double getX() {
+    return x;
+  }
+
+  public double getY() {
+    return y;
+  }
+
+  public void setX(double x) {
+    this.x = x;
+  }
+
+  public void setY(double y) {
+    this.y = y;
+  }
+
+  public void set(double x, double y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  public boolean equals(Vector2D other) {
+    return other != null && x == other.x && y == other.y;
+  }
+
+  public double dot(Vector2D in) {
+    return ((x) * in.x) + (y * in.y);
+  }
+
+  /**
+   * Vector length (magnitude) squared
+   */
+  public double normSqr() {
+    // Cast to F to prevent overflows
+    return (x * x) + (y * y);
+  }
+
+  public double norm() {
+    return Math.sqrt(normSqr());
+  }
+
+  public Vector2D mult(double d) {
+    return new Vector2D(x*d, y*d);
+  }
+
+  @Override
+  public int hashCode() {
+    final int prime = 31;
+    int result = 1;
+    long temp;
+    temp = Double.doubleToLongBits(x);
+    result = prime * result + (int) (temp ^ (temp >>> 32));
+    temp = Double.doubleToLongBits(y);
+    result = prime * result + (int) (temp ^ (temp >>> 32));
+    return result;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj)
+      return true;
+    if (obj == null)
+      return false;
+    if (getClass() != obj.getClass())
+      return false;
+    Vector2D other = (Vector2D) obj;
+    if (Double.doubleToLongBits(x) != Double.doubleToLongBits(other.x))
+      return false;
+    if (Double.doubleToLongBits(y) != Double.doubleToLongBits(other.y))
+      return false;
+    return true;
+  }
+  
+}