/**
*
Java Diagram Package; An extremely flexible and fast multipurpose diagram
component for Swing.
Copyright (C) 2001 Eric Crahen <crahen@cse.buffalo.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package diagram.figures;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import diagram.Figure;
/**
* @class CircularFigure
*
* @date 08-20-2001
* @author Eric Crahen
* @version 1.0
*
*
*/
public class CircularFigure extends Ellipse2D.Double
implements Cloneable, Figure, Serializable {
public CircularFigure() {
this(0, 0, 0, 0);
}
public CircularFigure(double w, double h) {
this(0, 0, w, h);
}
public CircularFigure(double x, double y, double w, double h) {
setFrame(x, y, w, h);
}
/**
* Get the rectangular bounds of this figure.
*
* @param Rectangle2D, use to avoid allocating a new object
* @return Rectangle2D
*/
public Rectangle2D getBounds2D(Rectangle2D rc) {
if(rc == null)
return getBounds2D();
rc.setRect(x, y, width, height);
return rc;
}
/**
* Get the center of this figure.
*
* @param Point2D, use to avoid allocating a new object
* @return Point2D
*/
public Point2D getCenter(Point2D pt) {
if(pt == null)
return new Point2D.Double(getCenterX(), getCenterY());
pt.setLocation(getCenterX(), getCenterY());
return pt;
}
/**
* Translate this figure.
*
* @param double
* @param double
*/
public void translate(double x, double y) {
this.x += x;
this.y += y;
}
/**
* Point on the boundary of this figure closest to some
* point outside this figures.
*
* @param Point2D point outside this Figure to connect to
* @param Point2D use to avoid allocating a new object
* @return Point2D
*/
public Point2D getConnection(Point2D ptFrom, Point2D pt) {
if(contains(ptFrom)) {
if(pt == null)
pt = new Point2D.Double();
pt.setLocation(ptFrom);
return pt;
}
// Get the angle
double centerX = getCenterX();
double centerY = getCenterY();
double dy = (ptFrom.getY() - centerY);
double dx = (ptFrom.getX() - centerX);
double theta = Math.atan2(dy, dx);
double rx = width / 2.0;
double ry = height / 2.0;
double A = centerX, B = centerY;
if(rx == ry) {
// Circle
A += rx*Math.cos(theta);
B += ry*Math.sin(theta);
} else {
// Ellipse
if((Math.abs(theta - (Math.PI/2.0)) == 0))
B += ry;
else if((Math.abs(theta + (Math.PI/2.0)) == 0))
B -= ry;
else {
double m = Math.tan(theta);
double n = rx*ry / (Math.sqrt(ry*ry + rx*rx * m*m));
if(theta > (Math.PI/2.0) || theta < -(Math.PI/2.0))
n = -n;
A += n;
B += m*n;
}
}
if(pt == null)
return new Point2D.Double(A, B);
pt.setLocation(A, B);
return pt;
}
/**
* Get the anchor for the Figure. This is usually the center
* of the Figure but does not always have to be.
*
* @param Point2D use to avoid allocating a new object
*
* @return Point2D
*/
public Point2D getAnchor(Point2D pt) {
return getCenter(pt);
}
/**
* Reshape this figure.
*
* @param double
* @param double
* @param double
* @param double
*/
public void setBounds(double x, double y, double w, double h) {
this.x = x;
this.y = y;
this.width = w;
this.height = h;
}
/**
* Generate a hashcode that will not be affected by the bounds of the
* Figure.
*/
private static int generateLocalHash() {
Class c = CircularFigure.class;
return (c.hashCode() + figureId++);
}
private int hash = generateLocalHash();
private static int figureId = 0;
public int hashCode() {
return figureId;
}
private void writeObject(java.io.ObjectOutputStream out)
throws java.io.IOException {
out.writeDouble(x);
out.writeDouble(y);
out.writeDouble(width);
out.writeDouble(height);
}
private void readObject(java.io.ObjectInputStream in)
throws java.io.IOException, ClassNotFoundException {
x = in.readDouble();
y = in.readDouble();
width = in.readDouble();
height = in.readDouble();
}
}