operatorrenderer.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.operator.Operator;

import java.awt.*;
import java.awt.geom.*;

/** Superclass for renderers that can display operators. Chains, wrappers and simple operators must be
 *  treated differently. */
public abstract class  OperatorRenderer {

    public static final Font NAME_FONT = new Font("LucidaSans", Font.BOLD, 12);
    public static final Font TYPE_FONT = new Font("LucidaSans", Font.PLAIN, 10);
    public static final int ICON_GAP   = 4;

    public void drawName(Operator op, Graphics2D g) {
	Image icon = op.getOperatorDescription().getIcon();
	int x = 0;
	int y = 0;
	if (icon != null) {
	    g.drawImage(icon, 0, 0, null);
	    x += icon.getWidth(null) + ICON_GAP;
	}
	g.setPaint(Color.black);
	g.setFont(NAME_FONT);
	Rectangle2D rect = NAME_FONT.getStringBounds(op.getName(), g.getFontRenderContext());
	g.drawString(op.getName(), (int)(x-rect.getX()), (int)(y-rect.getY()));
	y += rect.getHeight();

	g.setFont(TYPE_FONT);
	rect = TYPE_FONT.getStringBounds(op.getName(), g.getFontRenderContext());
	g.drawString(op.getOperatorDescription().getName(), (int)(x-rect.getX()), (int)(y-rect.getY()));
	y += rect.getHeight();
    }

    public Dimension getNameSize(Operator op, Graphics2D g) {
	Rectangle2D rect1 = NAME_FONT.getStringBounds(op.getName(), g.getFontRenderContext());
	Rectangle2D rect2 = TYPE_FONT.getStringBounds(op.getOperatorDescription().getName(), g.getFontRenderContext());
	double h = rect1.getHeight() + rect2.getHeight();
	double w = Math.max(rect1.getWidth(), rect2.getWidth());
	Image icon = op.getOperatorDescription().getIcon();
	if (icon != null) {
	    h = Math.max(icon.getHeight(null), h);
	    w += icon.getWidth(null) + ICON_GAP;
	}	
	return new Dimension((int)w, (int)h);
    }

    public abstract void drawOperator(Operator op, Graphics2D g);

    public abstract Dimension getSize(Operator op, Graphics2D g);
}