componentprinter.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  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 edu.udo.cs.yale.gui;

import edu.udo.cs.yale.Yale;

import java.awt.Component;
import java.awt.print.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Font;
import java.awt.geom.Rectangle2D;

/** A Printable that can print an arbitrary component. It scales and translates the pages such that 
 *  the complete component is visible. */
public class ComponentPrinter implements Printable {

    private Component component = null;
    private static final Font TITLE_FONT = new Font("LucidaSans", Font.PLAIN, 10);
    public ComponentPrinter(Component component) {
	this.component = component;
    }

    public int print(Graphics g, java.awt.print.PageFormat pageFormat, int pageIndex) {
	if (pageIndex >= 1) 
	    return NO_SUCH_PAGE;
	
	
	String title = "YALE: " + Yale.getExperiment().getExperimentFile().getName();
	Rectangle2D rect = TITLE_FONT.getStringBounds(title, ((Graphics2D)g).getFontRenderContext());
	g.setFont(TITLE_FONT);
	g.drawString(title,
		     (int)(pageFormat.getImageableX() + pageFormat.getImageableWidth()/2 - rect.getWidth()/2),
		     (int)(pageFormat.getImageableY() - rect.getY()));
	
	Graphics2D translated = (Graphics2D)g.create((int)pageFormat.getImageableX(),
						     (int)(pageFormat.getImageableY() + rect.getHeight()*2),
						     (int)pageFormat.getImageableWidth(),
						     (int)(pageFormat.getImageableHeight() - rect.getHeight()*2));
	translated.scale(0.72, 0.72);

	component.print(translated);
	translated.dispose();
	return PAGE_EXISTS;
    }

    
}