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The SteelSeries is a javabeans component library that contains gauges. You will find linear and radial gauges. In addition you will also find digital displays, indicators from cars and some instruments from airplanes and sailboats.
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/*
 * Copyright (c) 2012, Gerrit Grunwald
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * The names of its contributors may not be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package eu.hansolo.steelseries.tools;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;


/**
 * @author Gerrit Grunwald 
 */
public enum LcdImageFactory {

    INSTANCE;
    private final Util UTIL = Util.INSTANCE;
    private Rectangle2D boundsBuffer = new Rectangle2D.Double();
    private LcdColor lcdColorBuffer = LcdColor.WHITE_LCD;
    private Paint customLcdBackgroundBuffer = Color.RED;
    private BufferedImage lcdImageBuffer = UTIL.createImage(1, 1, Transparency.TRANSLUCENT);

    /**
     * Returns the image with the given lcd color.
     * @param BOUNDS
     * @param LCD_COLOR
     * @param CUSTOM_LCD_BACKGROUND
     * @param BACKGROUND_IMAGE
     * @return buffered image containing the lcd with the selected lcd color
     */
    public BufferedImage create_LCD_Image(final Rectangle2D BOUNDS, final LcdColor LCD_COLOR, final Paint CUSTOM_LCD_BACKGROUND, final BufferedImage BACKGROUND_IMAGE) {
        if (BOUNDS.getWidth() <= 0 || BOUNDS.getHeight() <= 0) {
            return UTIL.createImage(1, 1, Transparency.TRANSLUCENT);
        }

        if (BOUNDS.equals(boundsBuffer) && LCD_COLOR == lcdColorBuffer && CUSTOM_LCD_BACKGROUND == customLcdBackgroundBuffer) {
            if (BACKGROUND_IMAGE != null && lcdImageBuffer.getWidth() == BACKGROUND_IMAGE.getWidth()) {
                final Graphics2D G = BACKGROUND_IMAGE.createGraphics();
                G.drawImage(lcdImageBuffer, 0, 0, null);
                G.dispose();
            }
            return lcdImageBuffer;
        }

        lcdImageBuffer.flush();
        if (BACKGROUND_IMAGE != null) {
            lcdImageBuffer = UTIL.createImage(BACKGROUND_IMAGE.getWidth(), BACKGROUND_IMAGE.getHeight(), Transparency.TRANSLUCENT);
        } else {
            lcdImageBuffer = UTIL.createImage((int) BOUNDS.getWidth(), (int) BOUNDS.getHeight(), Transparency.TRANSLUCENT);
        }

        final Graphics2D G2 = lcdImageBuffer.createGraphics();

        G2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        G2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_NORMALIZE);

        // Background rectangle
        final Point2D BACKGROUND_START = new Point2D.Double(0.0, BOUNDS.getMinY());
        final Point2D BACKGROUND_STOP = new Point2D.Double(0.0, BOUNDS.getMaxY());
        if (BACKGROUND_START.equals(BACKGROUND_STOP)) {
            BACKGROUND_STOP.setLocation(0.0, BACKGROUND_START.getY() + 1);
        }

        final float[] BACKGROUND_FRACTIONS = {
            0.0f,
            0.08f,
            0.92f,
            1.0f
        };

        final Color[] BACKGROUND_COLORS = {
            new Color(0.3f, 0.3f, 0.3f, 1.0f),
            new Color(0.4f, 0.4f, 0.4f, 1.0f),
            new Color(0.4f, 0.4f, 0.4f, 1.0f),
            new Color(0.9f, 0.9f, 0.9f, 1.0f)
        };

        final LinearGradientPaint BACKGROUND_GRADIENT = new LinearGradientPaint(BACKGROUND_START, BACKGROUND_STOP, BACKGROUND_FRACTIONS, BACKGROUND_COLORS);
        final double BACKGROUND_CORNER_RADIUS = BOUNDS.getWidth() > BOUNDS.getHeight() ? (BOUNDS.getHeight() * 0.12) : (BOUNDS.getWidth() * 0.12);
        final RoundRectangle2D BACKGROUND = new RoundRectangle2D.Double(BOUNDS.getMinX(), BOUNDS.getMinY(), BOUNDS.getWidth(), BOUNDS.getHeight(), BACKGROUND_CORNER_RADIUS, BACKGROUND_CORNER_RADIUS);
        G2.setPaint(BACKGROUND_GRADIENT);
        G2.fill(BACKGROUND);

        // Foreground rectangle
        final Point2D FOREGROUND_START = new Point2D.Double(0.0, BOUNDS.getMinY() + 1.0);
        final Point2D FOREGROUND_STOP = new Point2D.Double(0.0, BOUNDS.getMaxY() - 1);
        if (FOREGROUND_START.equals(FOREGROUND_STOP)) {
            FOREGROUND_STOP.setLocation(0.0, FOREGROUND_START.getY() + 1);
        }

        final float[] FOREGROUND_FRACTIONS = {
            0.0f,
            0.03f,
            0.49f,
            0.5f,
            1.0f
        };

        final Color[] FOREGROUND_COLORS = {
            LCD_COLOR.GRADIENT_START_COLOR,
            LCD_COLOR.GRADIENT_FRACTION1_COLOR,
            LCD_COLOR.GRADIENT_FRACTION2_COLOR,
            LCD_COLOR.GRADIENT_FRACTION3_COLOR,
            LCD_COLOR.GRADIENT_STOP_COLOR
        };

        if (LCD_COLOR == LcdColor.CUSTOM) {
            G2.setPaint(CUSTOM_LCD_BACKGROUND);
        } else {
            final LinearGradientPaint FOREGROUND_GRADIENT = new LinearGradientPaint(FOREGROUND_START, FOREGROUND_STOP, FOREGROUND_FRACTIONS, FOREGROUND_COLORS);
            G2.setPaint(FOREGROUND_GRADIENT);
        }

        final double FOREGROUND_CORNER_RADIUS = BACKGROUND.getArcWidth() - 1;
        final RoundRectangle2D FOREGROUND = new RoundRectangle2D.Double(BOUNDS.getMinX() + 1, BOUNDS.getMinY() + 1, BOUNDS.getWidth() - 2, BOUNDS.getHeight() - 2, FOREGROUND_CORNER_RADIUS, FOREGROUND_CORNER_RADIUS);
        G2.fill(FOREGROUND);

        G2.dispose();


        if (BACKGROUND_IMAGE != null) {
            final Graphics2D G = BACKGROUND_IMAGE.createGraphics();
            G.drawImage(lcdImageBuffer, 0, 0, null);
            G.dispose();
        }

        // Buffer current values
        boundsBuffer.setRect(BOUNDS);
        lcdColorBuffer = LCD_COLOR;
        customLcdBackgroundBuffer = CUSTOM_LCD_BACKGROUND;

        return lcdImageBuffer;
    }
}