/**
*
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;
import java.awt.Component;
import java.awt.FontMetrics;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.PlainDocument;
import diagram.figures.PolyLink;
/**
* @class DefaultLabelRenderer
*
* @date 08-20-2001
* @author Eric Crahen
* @version 1.0
*
* This render paints a PolyLink as its label in the correct position
*/
public class LinkLabel extends JTextField
implements FigureRenderer {
protected Point2D p1 = null;
protected Point2D p2 = null;
public Document createDefaultModel() {
return new SimpleDocument();
}
protected void updateBounds() {
}
/**
*
*/
public Component getRendererComponent(Diagram diagram, Figure figure, boolean isSelected) {
return this;
}
/**
*
*/
public Rectangle2D getDecoratedBounds(Diagram diagram, Figure figure, Rectangle2D rcBounds) {
Object label = diagram.getModel().getValue(figure);
setText(label != null ? label.toString() : "");
if(rcBounds == null)
rcBounds = new Rectangle2D.Double();
return calculateLabelBounds((PolyLink)figure, getText(), rcBounds);
}
/**
* Find the longest segment.
*
* @param PolyLink
* @return int segment to draw label on
*/
protected int calculateLabelSegment(PolyLink link) {
double d, max = 0;
int n = 0;
// Find the longest segment
p2 = link.getPN(1, p2);
p1 = link.getSource().getConnection(p2, p1);
max = p1.distance(p2);
for(int i = 1; i < link.getSegmentCount() - 1; i++) {
p1 = link.getPN(i, p1);
p2 = link.getPN(i+1, p2);
if((d = p1.distance(p2)) > max) {
max = d;
n = i;
}
}
p2 = link.getPN(link.getPointCount() - 2, p2);
p1 = link.getSink().getConnection(p2, p1);
if((d = p1.distance(p2)) > max)
n = link.getSegmentCount() - 1;
return n;
}
/**
* Calculate where the label should be placed
*
* @param PolyLink
* @param Rectangle2D rectangle to fill with the bounds
*/
public Rectangle2D calculateLabelBounds(PolyLink link, String text, Rectangle2D rc) {
int seg = calculateLabelSegment(link);
double dx = 0;//getX();
double dy = 0;//getY();
double x1 = link.getXN(seg) - dx; double x2 = link.getXN(seg+1) - dx;
double y1 = link.getYN(seg) - dy; double y2 = link.getYN(seg+1) - dy;
dx = (x1 > x2) ? (x1 - x2)*-1 : (x2 - x1);
dy = (y1 > y2) ? (y1 - y2)*-1 : (y2 - y1);
FontMetrics metrics = getFontMetrics( getFont() );
int w = metrics.charsWidth(text.toCharArray(), 0, text.length());
int h = metrics.getHeight();
dx -= w;
dy -= h;
dx /= 2;
dy /= 2;
if(rc == null)
return new Rectangle2D.Double((x1 + dx), (y1 + dy), w, h);
rc.setFrame((x1 + dx), (y1 + dy), w, h);
return rc;
}
/**
* Modified document that notifies the component of the text changing.
*/
class SimpleDocument extends PlainDocument {
public void insertString(int offs, String str, AttributeSet a)
throws BadLocationException {
super.insertString(offs, str, a);
updateBounds();
}
public void remove(int offs, int len)
throws BadLocationException {
super.remove(offs, len);
updateBounds();
}
}
}