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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D APIs, it currently supports bar charts, pie charts,
line charts, XY-plots and time series plots.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -----------
* Vector.java
* -----------
* (C) Copyright 2007, 2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 30-Jan-2007 : Version 1 (DG);
* 24-May-2007 : Added getLength() and getAngle() methods, thanks to
* matinh (DG);
* 25-May-2007 : Moved from experimental to the main source tree (DG);
*
*/
package org.jfree.data.xy;
import java.io.Serializable;
/**
* A vector.
*
* @since 1.0.6
*/
public class Vector implements Serializable {
/** The vector x. */
private double x;
/** The vector y. */
private double y;
/**
* Creates a new instance of Vector.
*
* @param x the x-component.
* @param y the y-component.
*/
public Vector(double x, double y) {
this.x = x;
this.y = y;
}
/**
* Returns the x-value.
*
* @return The x-value.
*/
public double getX() {
return this.x;
}
/**
* Returns the y-value.
*
* @return The y-value.
*/
public double getY() {
return this.y;
}
/**
* Returns the length of the vector.
*
* @return The vector length.
*/
public double getLength() {
return Math.sqrt((this.x * this.x) + (this.y * this.y));
}
/**
* Returns the angle of the vector.
*
* @return The angle of the vector.
*/
public double getAngle() {
return Math.atan2(this.y, this.x);
}
/**
* Tests this vector for equality with an arbitrary object.
*
* @param obj the object (null not permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Vector)) {
return false;
}
Vector that = (Vector) obj;
if (this.x != that.x) {
return false;
}
if (this.y != that.y) {
return false;
}
return true;
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
@Override
public int hashCode() {
int result = 193;
long temp = Double.doubleToLongBits(this.x);
result = 37 * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(this.y);
result = 37 * result + (int) (temp ^ (temp >>> 32));
return result;
}
}