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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 static java.lang.Math.round;


/**
 * @author Gerrit Grunwald 
 */
public class Histogram {

    private final float MIN_VALUE; // the minimum value of the gauge dial
    private final float MINOR_TICKMARK_SPACING;  // the distance between two minor tickmarks
    private final double[] FREQUENCE;   // frequence[i] = # occurences of value i
    private double max;            // max frequency of any value
    private int n;

    // Create a new histogram.
    public Histogram(final double MIN_VALUE, final double MAX_VALUE, final double MINOR_TICKMARK_SPACING) {
        this.MIN_VALUE = (float) MIN_VALUE;
        this.MINOR_TICKMARK_SPACING = (float) MINOR_TICKMARK_SPACING;
        n = (int) ((MAX_VALUE - MIN_VALUE) / MINOR_TICKMARK_SPACING);

        FREQUENCE = new double[n];
    }

    // Add one occurrence of the value i.
    public void addDataPoint(final int INDEX) {
        FREQUENCE[INDEX > n - 1 ? n - 1 : INDEX]++;
        max = FREQUENCE[INDEX] > max ? FREQUENCE[INDEX] : max;
    }

    public void addDataPoint(final double VALUE) {
        int index = round((float) VALUE / MINOR_TICKMARK_SPACING) - round(MIN_VALUE / MINOR_TICKMARK_SPACING);
        addDataPoint(index);
    }

    public double[] getData() {
        return FREQUENCE.clone();
    }
}