/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.tools;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.GeneralPath;

import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.SwingConstants;

/**
 * 
 * @author Simon Fischer
 */
public class ArrowButton extends JButton {

	private static final long serialVersionUID = -355433594066885069L;

	private int direction = SwingConstants.EAST;
	
	public ArrowButton(int direction) {
		super();
		setText(" ");
		this.direction = direction;
	}

	public ArrowButton(Action a) {
		this(a, SwingConstants.EAST);
	}
	
	public ArrowButton(Action a, int direction) {
		super(a);
		setText(" ");	
		this.direction = direction;
	}
 
	
	public void setDirection(int dir) {
		this.direction = dir;
		repaint();
	}
	
	@Override
	public void paintComponent(Graphics g) {
		super.paintComponent(g);

		GeneralPath arrow = new GeneralPath();
		int w, h;
		switch (direction) {
		case SwingConstants.SOUTH:
			h = 2;
			w = 4;
			arrow.moveTo(getWidth()/2-w, getHeight()/2);
			arrow.lineTo(getWidth()/2+w, getHeight()/2);
			arrow.lineTo(getWidth()/2, getHeight()/2+2*h);
			arrow.closePath();
			break;
		case SwingConstants.EAST:
			w = 2;
			h = 4;
			arrow.moveTo(getWidth()/2-w, getHeight()/2-h);
			arrow.lineTo(getWidth()/2+w, getHeight()/2);
			arrow.lineTo(getWidth()/2-w, getHeight()/2+h);
			arrow.closePath();
			break;
		default:
			throw new IllegalArgumentException("Illegal direction: "+direction);
		}
		if (isEnabled()) {
			g.setColor(Color.BLACK);
		} else {
			g.setColor(Color.GRAY);
		}
		((Graphics2D)g).fill(arrow);
	}
}