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package tim.prune.data;
/**
* Class to hold an altitude and provide conversion functions
*/
public class Altitude
{
private boolean _valid = false;
private double _value = 0.0;
private Unit _unit = null;
private String _stringValue = null;
/** Constant to use for a lack of altitude */
public static final Altitude NONE = new Altitude(null, null);
/**
* Constructor using String
* @param inString string to parse
* @param inUnit of altitude, either metres or feet
*/
public Altitude(String inString, Unit inUnit) {
set(inString, inUnit);
}
/**
* Constructor with double value
* @param inValue double value of altitude
* @param inUnit unit of altitude, either metres or feet
*/
public Altitude(double inValue, Unit inUnit)
{
_value = inValue;
_unit = inUnit;
_valid = true;
_stringValue = "" + inValue;
}
/**
* Constructor with another Altitude value
*/
public Altitude(Altitude inOther)
{
_value = inOther._value;
_unit = inOther._unit;
_valid = inOther._valid;
_stringValue = inOther._stringValue;
}
/**
* Reset the altitude parameters to the same as the given object
* @param inValue value to set as string
* @param inUnit units
*/
public void set(String inValue, Unit inUnit)
{
_stringValue = inValue;
_unit = inUnit;
final String trimmedValue = (inValue == null ? "" : inValue.trim());
final Double result = NumberUtils.parseDoubleUsingLocale(trimmedValue);
_value = (result != null ? result : 0.0);
_valid = (result != null);
}
/**
* @return true if the value could be parsed
*/
public boolean isValid() {
return _valid;
}
/**
* @return raw value as double
*/
public double getValue() {
return _value;
}
/**
* @param inAltUnit altitude units to use
* @return value in specified units (unrounded)
*/
public double getValue(Unit inAltUnit)
{
if (inAltUnit == null) {
return getValue();
}
return getMetricValue() * inAltUnit.getMultFactorFromStd();
}
/**
* @param inAltUnit altitude units to use
* @return value in specified units (rounded to the nearest int)
*/
public int getIntValue(Unit inAltUnit) {
return (int) Math.round(getValue(inAltUnit));
}
/**
* @return unit of number
*/
public Unit getUnit() {
return _unit;
}
/**
* @return value of altitude in metres, used for calculations and charts
*/
public double getMetricValue()
{
if (_unit == UnitSetLibrary.UNITS_METRES || _unit == null) {
return _value;
}
return _value / _unit.getMultFactorFromStd();
}
/**
* Get a string version of the value
* @param inUnit specified unit
* @return string value, if possible the original one
*/
public String getStringValue(Unit inUnit)
{
if (!_valid) {
return "";
}
// Return string value if the same format or "no format" was requested
if ((inUnit == _unit || inUnit == null)
&& _stringValue != null && !_stringValue.equals(""))
{
return _stringValue;
}
return "" + getValue(inUnit);
}
/**
* Get a locally-formatted string version of the value
* @param inUnit specified unit
* @return string value using the local formatting
*/
public String getLocalStringValue(Unit inUnit)
{
if (!_valid) {
return "";
}
return NumberUtils.formatNumberLocalToMatch(getValue(inUnit), _stringValue);
}
/**
* Interpolate a new Altitude object between the given ones
* @param inStart start altitude
* @param inEnd end altitude
* @param inIndex index of interpolated point
* @param inNumSteps number of steps to interpolate
* @return Interpolated Altitude object
*/
public static Altitude interpolate(Altitude inStart, Altitude inEnd, int inIndex, int inNumSteps)
{
return interpolate(inStart, inEnd, 1.0 * (inIndex + 1) / (inNumSteps + 1));
}
/**
* Interpolate a new Altitude object between the given ones
* @param inStart start altitude
* @param inEnd end altitude
* @param inFrac fraction of distance from first point
* @return Interpolated Altitude object
*/
public static Altitude interpolate(Altitude inStart, Altitude inEnd, double inFrac)
{
// Check if altitudes are valid
if (inStart == null || inEnd == null || !inStart.isValid() || !inEnd.isValid()) {
return Altitude.NONE;
}
// Use altitude format of first point
Unit altUnit = inStart.getUnit();
double startValue = inStart.getValue();
double endValue = inEnd.getValue(altUnit);
// interpolate between start and end
double newValue = startValue + (endValue - startValue) * inFrac;
return new Altitude(newValue, altUnit);
}
}
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