it.alus.GPSreceiver.instruments.SatelliteRadar.java Source code

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Here is the source code for it.alus.GPSreceiver.instruments.SatelliteRadar.java

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//============================================================================
// This file is part of GPSreceiver: a Java demo program that parses NMEA
// sentences from a serial GPS receiver and displays live the received data.
// Author         : Alberto Realis-Luc <alberto.realisluc@gmail.com>
// Since          : July 2010
// Web            : http://www.alus.it/airnavigator/gpsreceiver/
// Git Repository : https://github.com/alus-it/GPSreceiver.git
// Version        : 0.1
// Copyright      :  2010 Alberto Realis-Luc
// License        : GPL
// Last change    : 2 March 2011
//============================================================================

package it.alus.GPSreceiver.instruments;

import it.alus.GPSreceiver.sentences.GSV;
import java.awt.Color;
import java.awt.Dimension;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PolarPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class SatelliteRadar extends ChartPanel {
    private static final long serialVersionUID = 2785753501853018650L;
    private static final int MAX_SAT = 50;
    private int azimuth[], elevation[], snr[];
    private XYSeries satSeries;
    private JFreeChart jChart = null;

    public SatelliteRadar() {
        super(null);
        azimuth = new int[MAX_SAT];
        elevation = new int[MAX_SAT];
        snr = new int[MAX_SAT];
        resetArray();
        satSeries = new XYSeries("Satellites");
        XYSeriesCollection seriescollection = new XYSeriesCollection();
        seriescollection.addSeries(satSeries);
        jChart = ChartFactory.createPolarChart("Satellites", seriescollection, true, false, false);
        jChart.setBackgroundPaint(Color.white);
        PolarPlot polarplot = (PolarPlot) jChart.getPlot();
        polarplot.setBackgroundPaint(Color.lightGray);
        polarplot.setAngleGridlinePaint(Color.white);
        polarplot.setRadiusGridlinePaint(Color.white);
        NumberAxis numberaxis = (NumberAxis) polarplot.getAxis();
        numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        super.setChart(jChart);
        super.setMouseZoomable(false);
        super.setPreferredSize(new Dimension(500, 270));
    }

    private void resetArray() {
        for (int i = 0; i < MAX_SAT; i++)
            azimuth[i] = -1;
    }

    public void receiveGSVsentence(GSV gsv) {
        if (gsv.getGSVmsgSequenceNo() == 1)
            resetArray();
        for (int i = 0; i < gsv.getSatellitesNumberOfMsg(); i++) {
            azimuth[gsv.getSatPRN(i)] = gsv.getSatAzimuth(i);
            elevation[gsv.getSatPRN(i)] = gsv.getSatElevation(i);
            snr[gsv.getSatPRN(i)] = gsv.getSatSNR(i);
        }
        if (gsv.isLastMsgOfSeq())
            updateRadar();
    }

    private void updateRadar() {
        satSeries.clear();
        for (int i = 0; i < MAX_SAT; i++)
            if (azimuth[i] != -1) {
                satSeries.add(azimuth[i], 90 - elevation[i]);
            }
    }

}