X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fdata%2FSpeed.java;fp=src%2Ftim%2Fprune%2Fdata%2FSpeed.java;h=80cb7dffc0b95a1f4e126ffae2b82605880cd4f2;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/data/Speed.java b/src/tim/prune/data/Speed.java
new file mode 100644
index 0000000..80cb7df
--- /dev/null
+++ b/src/tim/prune/data/Speed.java
@@ -0,0 +1,102 @@
+package tim.prune.data;
+
+/**
+ * Class to hold either a horizontal speed or a vertical speed
+ * including the units
+ */
+public class Speed
+{
+	private double _value = 0.0;
+	private Unit   _unit  = null;
+	private boolean _valid = false;
+
+	/**
+	 * Constructor
+	 * @param inValue value
+	 * @param inUnit unit, such as m/s or km/h
+	 */
+	public Speed(double inValue, Unit inUnit)
+	{
+		_value = inValue;
+		_unit  = inUnit;
+		_valid = isValidUnit(inUnit);
+	}
+
+	/**
+	 * Constructor
+	 * @param inValue value as string
+	 * @param inUnit unit, such as m/s or km/h
+	 */
+	public Speed(String inValue, Unit inUnit)
+	{
+		try {
+			_value = Double.parseDouble(inValue);
+			_unit  = inUnit;
+			_valid = isValidUnit(inUnit);
+		}
+		catch (Exception e)
+		{
+			_valid = false;
+		}
+	}
+
+	/**
+	 * Check if the given unit is valid for a speed
+	 * @param inUnit unit
+	 * @return true if it's valid
+	 */
+	private static boolean isValidUnit(Unit inUnit)
+	{
+		return inUnit != null && (inUnit == UnitSetLibrary.SPEED_UNITS_METRESPERSEC
+				|| inUnit == UnitSetLibrary.SPEED_UNITS_KMPERHOUR
+				|| inUnit == UnitSetLibrary.SPEED_UNITS_FEETPERSEC
+				|| inUnit == UnitSetLibrary.SPEED_UNITS_MILESPERHOUR
+				|| inUnit == UnitSetLibrary.SPEED_UNITS_KNOTS);
+	}
+
+	/**
+	 * Invert the speed value, for example when vertical speeds are positive downwards
+	 */
+	public void invert() {
+		if (_valid) _value = -_value;
+	}
+
+	/** @return the numerical value in whatever units they're in */
+	public double getValue() {return _value;}
+
+	/** @return the units they're in */
+	public Unit getUnit() {return _unit;}
+
+	/**
+	 * @return speed value in metres per second
+	 */
+	public double getValueInMetresPerSec()
+	{
+		if (!_valid) return 0.0;
+		return _value / _unit.getMultFactorFromStd();
+	}
+
+	/**
+	 * @param inUnit specified speed units
+	 * @return speed value in the specified units
+	 */
+	public double getValue(Unit inUnit)
+	{
+		if (!_valid || !isValidUnit(inUnit)) return 0.0;
+		return getValueInMetresPerSec() * inUnit.getMultFactorFromStd();
+	}
+
+	/** @return true if this is valid */
+	public boolean isValid() {return _valid;}
+
+	/**
+	 * Copy the values from the other object into this one, to make this one a clone
+	 * @param inOther other speed object
+	 */
+	public void copyFrom(Speed inOther)
+	{
+		_value = inOther._value;
+		_unit  = inOther._unit;
+		_valid = inOther._valid;
+	}
+}