--- /dev/null
+package tim.prune.data;
+
+/**
+ * Class to represent a single data point in the series
+ * including all its fields
+ * Can be either a track point or a waypoint
+ */
+public class DataPoint
+{
+ // Hold these as Strings? Or FieldValue objects?
+ private String[] _fieldValues = null;
+ // list of fields
+ private FieldList _fieldList = null;
+ // Special fields for coordinates
+ private Coordinate _latitude = null, _longitude = null;
+ private Altitude _altitude;
+ private Timestamp _timestamp = null;
+ private boolean _pointValid = false;
+
+
+ // TODO: Make it possible to turn track point into waypoint - may need to alter FieldList
+
+ /**
+ * Constructor
+ * @param inValueArray array of String values
+ * @param inFieldList list of fields
+ * @param inAltFormat altitude format
+ */
+ public DataPoint(String[] inValueArray, FieldList inFieldList, int inAltFormat)
+ {
+ // save data
+ _fieldValues = inValueArray;
+ // save list of fields
+ _fieldList = inFieldList;
+
+ // parse fields
+ _latitude = new Latitude(getFieldValue(Field.LATITUDE));
+ _longitude = new Longitude(getFieldValue(Field.LONGITUDE));
+ _altitude = new Altitude(getFieldValue(Field.ALTITUDE), inAltFormat);
+ _timestamp = new Timestamp(getFieldValue(Field.TIMESTAMP));
+ }
+
+
+ /**
+ * Private constructor for artificially generated points (eg interpolated)
+ * @param inLatitude latitude
+ * @param inLongitude longitude
+ * @param inAltitude altitude
+ */
+ private DataPoint(Coordinate inLatitude, Coordinate inLongitude, Altitude inAltitude)
+ {
+ // Only these three fields are available
+ _fieldValues = new String[0];
+ _fieldList = new FieldList();
+ _latitude = inLatitude;
+ _longitude = inLongitude;
+ _altitude = inAltitude;
+ _timestamp = new Timestamp(null);
+ }
+
+
+ /**
+ * Get the value for the given field
+ * @param inField field to interrogate
+ * @return value of field
+ */
+ public String getFieldValue(Field inField)
+ {
+ return getFieldValue(_fieldList.getFieldIndex(inField));
+ }
+
+
+ /**
+ * Get the value at the given index
+ * @param inIndex index number starting at zero
+ * @return field value, or null if not found
+ */
+ public String getFieldValue(int inIndex)
+ {
+ if (_fieldValues == null || inIndex < 0 || inIndex >= _fieldValues.length)
+ return null;
+ return _fieldValues[inIndex];
+ }
+
+
+ public Coordinate getLatitude()
+ {
+ return _latitude;
+ }
+ public Coordinate getLongitude()
+ {
+ return _longitude;
+ }
+ public boolean hasAltitude()
+ {
+ return _altitude.isValid();
+ }
+ public Altitude getAltitude()
+ {
+ return _altitude;
+ }
+ public boolean hasTimestamp()
+ {
+ return _timestamp.isValid();
+ }
+ public Timestamp getTimestamp()
+ {
+ return _timestamp;
+ }
+
+ /**
+ * @return true if point has a waypoint name
+ */
+ public boolean isWaypoint()
+ {
+ String name = getFieldValue(Field.WAYPT_NAME);
+ return (name != null && !name.equals(""));
+ }
+
+ /**
+ * Compare two DataPoint objects to see if they
+ * are duplicates
+ * @param inOther other object to compare
+ * @return true if the points are equivalent
+ */
+ public boolean isDuplicate(DataPoint inOther)
+ {
+ if (inOther == null) return false;
+ if (_longitude == null || _latitude == null
+ || inOther._longitude == null || inOther._latitude == null)
+ {
+ return false;
+ }
+ // Compare latitude and longitude
+ if (!_longitude.equals(inOther._longitude) || !_latitude.equals(inOther._latitude))
+ {
+ return false;
+ }
+ // Note that conversion from decimal to dms can make non-identical points into duplicates
+ // Compare description (if any)
+ String name1 = getFieldValue(Field.WAYPT_NAME);
+ String name2 = inOther.getFieldValue(Field.WAYPT_NAME);
+ if (name1 == null || name1.equals(""))
+ {
+ return (name2 == null || name2.equals(""));
+ }
+ else
+ {
+ return (name2 != null && name2.equals(name1));
+ }
+ }
+
+
+ /**
+ * @return true if the point is valid
+ */
+ public boolean isValid()
+ {
+ return _latitude.isValid() && _longitude.isValid();
+ }
+
+
+ /**
+ * Interpolate a set of points between this one and the given one
+ * @param inEndPoint end point of interpolation
+ * @param inNumPoints number of points to generate
+ * @return the DataPoint array
+ */
+ public DataPoint[] interpolate(DataPoint inEndPoint, int inNumPoints)
+ {
+ DataPoint[] range = new DataPoint[inNumPoints];
+ Coordinate endLatitude = inEndPoint.getLatitude();
+ Coordinate endLongitude = inEndPoint.getLongitude();
+ Altitude endAltitude = inEndPoint.getAltitude();
+
+ // Loop over points
+ for (int i=0; i<inNumPoints; i++)
+ {
+ Coordinate latitude = Coordinate.interpolate(_latitude, endLatitude, i, inNumPoints);
+ Coordinate longitude = Coordinate.interpolate(_longitude, endLongitude, i, inNumPoints);
+ Altitude altitude = Altitude.interpolate(_altitude, endAltitude, i, inNumPoints);
+ range[i] = new DataPoint(latitude, longitude, altitude);
+ }
+ return range;
+ }
+
+
+ /**
+ * Calculate the number of radians between two points (for distance calculation)
+ * @param inPoint1 first point
+ * @param inPoint2 second point
+ * @return angular distance between points in radians
+ */
+ public static double calculateRadiansBetween(DataPoint inPoint1, DataPoint inPoint2)
+ {
+ if (inPoint1 == null || inPoint2 == null)
+ return 0.0;
+ final double TO_RADIANS = Math.PI / 180.0;
+ // Get lat and long from points
+ double lat1 = inPoint1.getLatitude().getDouble() * TO_RADIANS;
+ double lat2 = inPoint2.getLatitude().getDouble() * TO_RADIANS;
+ double lon1 = inPoint1.getLongitude().getDouble() * TO_RADIANS;
+ double lon2 = inPoint2.getLongitude().getDouble() * TO_RADIANS;
+ // Formula given by Wikipedia:Great-circle_distance as follows:
+ // angle = 2 arcsin( sqrt( (sin ((lat2-lat1)/2))^^2 + cos(lat1)cos(lat2)(sin((lon2-lon1)/2))^^2))
+ double firstSine = Math.sin((lat2-lat1) / 2.0);
+ double secondSine = Math.sin((lon2-lon1) / 2.0);
+ double term2 = Math.cos(lat1) * Math.cos(lat2) * secondSine * secondSine;
+ double answer = 2 * Math.asin(Math.sqrt(firstSine*firstSine + term2));
+ // phew
+ return answer;
+ }
+}
projects / GpsPrune.git / blobdiff