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JCommon is a free general purpose Java class library that is used in
several projects at www.jfree.org, including JFreeChart and
JFreeReport.
/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/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.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* --------------------
* RectangleAnchor.java
* --------------------
* (C) Copyright 2003-2005, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: RectangleAnchor.java,v 1.6 2005/10/18 13:18:34 mungady Exp $
*
* Changes:
* --------
* 31-Oct-2003 (DG);
* 01-Apr-2004 : Changed java.awt.geom.Dimension2D to org.jfree.ui.Size2D
* because of JDK bug 4976448 which persists on JDK 1.3.1 (DG);
* 21-Jan-2005 : Changed return type of coordinates() method (DG);
*
*/
package org.jfree.ui;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.ObjectStreamException;
import java.io.Serializable;
/**
* Used to indicate an anchor point for a rectangle.
*
* @author David Gilbert
*/
public final class RectangleAnchor implements Serializable {
/** For serialization. */
private static final long serialVersionUID = -2457494205644416327L;
/** Center. */
public static final RectangleAnchor CENTER
= new RectangleAnchor("RectangleAnchor.CENTER");
/** Top. */
public static final RectangleAnchor TOP
= new RectangleAnchor("RectangleAnchor.TOP");
/** Top-Left. */
public static final RectangleAnchor TOP_LEFT
= new RectangleAnchor("RectangleAnchor.TOP_LEFT");
/** Top-Right. */
public static final RectangleAnchor TOP_RIGHT
= new RectangleAnchor("RectangleAnchor.TOP_RIGHT");
/** Bottom. */
public static final RectangleAnchor BOTTOM
= new RectangleAnchor("RectangleAnchor.BOTTOM");
/** Bottom-Left. */
public static final RectangleAnchor BOTTOM_LEFT
= new RectangleAnchor("RectangleAnchor.BOTTOM_LEFT");
/** Bottom-Right. */
public static final RectangleAnchor BOTTOM_RIGHT
= new RectangleAnchor("RectangleAnchor.BOTTOM_RIGHT");
/** Left. */
public static final RectangleAnchor LEFT
= new RectangleAnchor("RectangleAnchor.LEFT");
/** Right. */
public static final RectangleAnchor RIGHT
= new RectangleAnchor("RectangleAnchor.RIGHT");
/** The name. */
private String name;
/**
* Private constructor.
*
* @param name the name.
*/
private RectangleAnchor(final String name) {
this.name = name;
}
/**
* Returns a string representing the object.
*
* @return The string.
*/
public String toString() {
return this.name;
}
/**
* Returns true if this object is equal to the specified
* object, and false otherwise.
*
* @param obj the other object (null permitted).
*
* @return A boolean.
*/
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof RectangleAnchor)) {
return false;
}
final RectangleAnchor order = (RectangleAnchor) obj;
if (!this.name.equals(order.name)) {
return false;
}
return true;
}
/**
* Returns a hash code value for the object.
*
* @return The hashcode
*/
public int hashCode() {
return this.name.hashCode();
}
/**
* Returns the (x, y) coordinates of the specified anchor.
*
* @param rectangle the rectangle.
* @param anchor the anchor.
*
* @return The (x, y) coordinates.
*/
public static Point2D coordinates(final Rectangle2D rectangle,
final RectangleAnchor anchor) {
Point2D result = new Point2D.Double();
if (anchor == RectangleAnchor.CENTER) {
result.setLocation(rectangle.getCenterX(), rectangle.getCenterY());
}
else if (anchor == RectangleAnchor.TOP) {
result.setLocation(rectangle.getCenterX(), rectangle.getMinY());
}
else if (anchor == RectangleAnchor.BOTTOM) {
result.setLocation(rectangle.getCenterX(), rectangle.getMaxY());
}
else if (anchor == RectangleAnchor.LEFT) {
result.setLocation(rectangle.getMinX(), rectangle.getCenterY());
}
else if (anchor == RectangleAnchor.RIGHT) {
result.setLocation(rectangle.getMaxX(), rectangle.getCenterY());
}
else if (anchor == RectangleAnchor.TOP_LEFT) {
result.setLocation(rectangle.getMinX(), rectangle.getMinY());
}
else if (anchor == RectangleAnchor.TOP_RIGHT) {
result.setLocation(rectangle.getMaxX(), rectangle.getMinY());
}
else if (anchor == RectangleAnchor.BOTTOM_LEFT) {
result.setLocation(rectangle.getMinX(), rectangle.getMaxY());
}
else if (anchor == RectangleAnchor.BOTTOM_RIGHT) {
result.setLocation(rectangle.getMaxX(), rectangle.getMaxY());
}
return result;
}
/**
* Creates a new rectangle with the specified dimensions that is aligned to
* the given anchor point (anchorX, anchorY).
*
* @param dimensions the dimensions (null not permitted).
* @param anchorX the x-anchor.
* @param anchorY the y-anchor.
* @param anchor the anchor (null not permitted).
*
* @return A rectangle.
*/
public static Rectangle2D createRectangle(final Size2D dimensions,
final double anchorX,
final double anchorY,
final RectangleAnchor anchor) {
Rectangle2D result = null;
final double w = dimensions.getWidth();
final double h = dimensions.getHeight();
if (anchor == RectangleAnchor.CENTER) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.TOP) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.BOTTOM) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.LEFT) {
result = new Rectangle2D.Double(
anchorX, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.RIGHT) {
result = new Rectangle2D.Double(
anchorX - w, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.TOP_LEFT) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.TOP_RIGHT) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.BOTTOM_LEFT) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
else if (anchor == RectangleAnchor.BOTTOM_RIGHT) {
result = new Rectangle2D.Double(
anchorX - w / 2.0, anchorY - h / 2.0, w, h
);
}
return result;
}
/**
* Ensures that serialization returns the unique instances.
*
* @return The object.
*
* @throws ObjectStreamException if there is a problem.
*/
private Object readResolve() throws ObjectStreamException {
RectangleAnchor result = null;
if (this.equals(RectangleAnchor.CENTER)) {
result = RectangleAnchor.CENTER;
}
else if (this.equals(RectangleAnchor.TOP)) {
result = RectangleAnchor.TOP;
}
else if (this.equals(RectangleAnchor.BOTTOM)) {
result = RectangleAnchor.BOTTOM;
}
else if (this.equals(RectangleAnchor.LEFT)) {
result = RectangleAnchor.LEFT;
}
else if (this.equals(RectangleAnchor.RIGHT)) {
result = RectangleAnchor.RIGHT;
}
else if (this.equals(RectangleAnchor.TOP_LEFT)) {
result = RectangleAnchor.TOP_LEFT;
}
else if (this.equals(RectangleAnchor.TOP_RIGHT)) {
result = RectangleAnchor.TOP_RIGHT;
}
else if (this.equals(RectangleAnchor.BOTTOM_LEFT)) {
result = RectangleAnchor.BOTTOM_LEFT;
}
else if (this.equals(RectangleAnchor.BOTTOM_RIGHT)) {
result = RectangleAnchor.BOTTOM_RIGHT;
}
return result;
}
}
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