1 | /*
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2 | * To change this template, choose Tools | Templates
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3 | * and open the template in the editor.
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4 | */
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5 |
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6 | package routegui;
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7 |
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8 | import java.io.IOException;
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9 | import java.util.Calendar;
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10 | import org.jdesktop.swingx.mapviewer.GeoPosition;
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11 |
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12 | /**
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13 | *
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14 | * @author rick
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15 | * http://www.codepedia.com/1/The+GPRMC+Sentence
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16 | */
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17 | public class GPRMC {
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18 | /* 0: The Command Word */
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19 | /**
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20 | * 1: Satellite-Derived Time in UTC, in a compressed form "HHMMSS.XXX,"
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21 | * 9: UTC Date, to be put into calendar format DDMMYY
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22 | */
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23 | public Calendar calendar;
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24 | /**
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25 | * 2: Satelite fix status
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26 | */
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27 | public Boolean sateliteFixStatus;
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28 | /**
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29 | * 3: latitudeDecimalDegrees HHMM.M
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30 | * 4: latitudeHemisphere [N|S]
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31 | * 5: DoubleitudeDecimalDegrees HHHMM.M
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32 | * 6: DoubleitudeHemisphere [E|W]
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33 | * converted to Geoposition
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34 | */
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35 | public GeoPosition position;
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36 | /**
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37 | * 7: speed in knobs
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38 | */
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39 | public Double speed;
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40 | /**
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41 | * 8: bearing, measured as an "azimuth.", where 0 represents north,
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42 | * 90 represents east, 180 represents south and 270 represents west.
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43 | */
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44 | public Double bearing;
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45 | /* 10: Empty */
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46 | /* 11: Empty */
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47 | /* 12: Empty */
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48 | /* 13: Checksum field */
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49 |
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50 | private String getChecksum(String strLine) {
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51 | int checksum = strLine.charAt(1);
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52 | for (int i = 2; i < strLine.length() - 3; i++ ){
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53 | checksum = checksum ^ strLine.charAt(i);
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54 | }
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55 | return String.format("%1x", checksum);
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56 | }
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57 |
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58 | GPRMC() {
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59 |
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60 | }
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61 |
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62 |
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63 | GPRMC(String strLine) {
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64 | boolean result = process(strLine);
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65 | }
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66 |
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67 | public boolean process(String strLine) {
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68 | String[] strSub = strLine.split("[,*]");
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69 |
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70 | /* Checking sentence is valid using checksum */
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71 | if (! getChecksum(strLine).equals(strSub[13])) {
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72 | return false;
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73 | }
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74 |
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75 |
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76 | /* Set calendar */
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77 | calendar = Calendar.getInstance();
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78 | calendar.set(Calendar.DAY_OF_MONTH,
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79 | Integer.parseInt(strSub[9].substring(0,2)));
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80 | calendar.set(Calendar.MONTH,
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81 | Integer.parseInt(strSub[9].substring(2,4)));
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82 | calendar.set(Calendar.YEAR,
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83 | Integer.parseInt(strSub[9].substring(4,6)) + 2000);
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84 | calendar.set(Calendar.HOUR,
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85 | Integer.parseInt(strSub[1].substring(0,2)));
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86 | calendar.set(Calendar.MINUTE,
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87 | Integer.parseInt(strSub[1].substring(2,4)));
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88 | calendar.set(Calendar.SECOND,
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89 | Integer.parseInt(strSub[1].substring(4,6)));
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90 | calendar.set(Calendar.MILLISECOND,
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91 | Integer.parseInt(strSub[1].substring(7,9)));
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92 |
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93 | /* Set fix status */
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94 | sateliteFixStatus = strSub[2].equalsIgnoreCase("A");
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95 |
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96 | if (sateliteFixStatus) {
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97 | /**
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98 | * Set position,
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99 | * see: http://en.wikipedia.org/wiki/Geographic_coordinate_conversion
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100 | * @todo: Milliseconds are ignored in calculation
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101 | */
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102 |
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103 | Double latitude = Double.parseDouble(strSub[3].substring(0, 2));
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104 | latitude += Double.parseDouble(strSub[3].substring(2)) / 60;
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105 | if (strSub[4].equalsIgnoreCase("S")) {
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106 | latitude = latitude * -1;
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107 | }
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108 |
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109 | Double longitude = Double.parseDouble(strSub[5].substring(0, 3));
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110 | longitude += Double.parseDouble(strSub[5].substring(3)) / 60;
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111 | if (strSub[6].equalsIgnoreCase("W")) {
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112 | longitude = longitude * -1;
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113 | }
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114 |
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115 | position = new GeoPosition(latitude, longitude);
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116 |
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117 | /* Set speed in knobs */
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118 | speed = Double.parseDouble(strSub[7]);
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119 |
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120 | /* Set bearing if available */
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121 | if (strSub[8].isEmpty()) {
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122 | bearing = null;
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123 | } else {
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124 | bearing = Double.parseDouble(strSub[8]);
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125 | }
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126 | }
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127 | return true;
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128 | }
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129 | }
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