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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart
There is a newer version: 1.5.9
/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, ArrowPanel.java is part of JTStand.
 *
 * JTStand is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GTStand.  If not, see .
 */

package org.jfree.ui;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;

/**
 * A basic panel that displays a small up or down arrow.
 *
 * @author David Gilbert
 */
public class ArrowPanel extends JPanel {

    /** A constant for the up arrow. */
    public static final int UP = 0;

    /** A constant for the down arrow. */
    public static final int DOWN = 1;

    /** The arrow type. */
    private int type = UP;

    /** The available area. */
    private Rectangle2D available = new Rectangle2D.Float();

    /**
     * Creates a new arrow panel.
     *
     * @param type  the arrow type.
     */
    public ArrowPanel(final int type) {
        this.type = type;
        setPreferredSize(new Dimension(14, 9));
    }

    /**
     * Paints the arrow panel.
     *
     * @param g  the graphics device for drawing on.
     */
    public void paintComponent(final Graphics g) {

        super.paintComponent(g);
        final Graphics2D g2 = (Graphics2D) g;

        // first determine the size of the drawing area...
        final Dimension size = getSize();
        final Insets insets = getInsets();
        this.available.setRect(insets.left, insets.top,
                               size.getWidth() - insets.left - insets.right,
                               size.getHeight() - insets.top - insets.bottom);
        g2.translate(insets.left, insets.top);
        g2.fill(getArrow(this.type));

    }

    /**
     * Returns a shape for the arrow.
     *
     * @param t  the arrow type.
     *
     * @return the arrow shape.
     */
    private Shape getArrow(final int t) {
        switch (t) {
            case UP : return getUpArrow();
            case DOWN : return getDownArrow();
            default : return getUpArrow();
        }
    }

    /**
     * Returns an up arrow.
     *
     * @return an up arrow.
     */
    private Shape getUpArrow() {
        final Polygon result = new Polygon();
        result.addPoint(7, 2);
        result.addPoint(2, 7);
        result.addPoint(12, 7);
        return result;
    }

    /**
     * Returns a down arrow.
     *
     * @return a down arrow.
     */
    private Shape getDownArrow() {
        final Polygon result = new Polygon();
        result.addPoint(7, 7);
        result.addPoint(2, 2);
        result.addPoint(12, 2);
        return result;
    }

}