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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 int _value = 0;
private Format _format = Format.NO_FORMAT;
private String _stringValue = null;
/** Altitude formats */
public enum Format {
/** No format */
NO_FORMAT,
/** Metres */
METRES,
/** Feet */
FEET
}
/** Constants for conversion */
private static final double CONVERT_FEET_TO_METRES = 0.3048;
private static final double CONVERT_METRES_TO_FEET = 3.28084;
/** Constant for no altitude value */
public static final Altitude NONE = new Altitude(null, Format.NO_FORMAT);
/**
* Constructor using String
* @param inString string to parse
* @param inFormat format of altitude, either metres or feet
*/
public Altitude(String inString, Format inFormat)
{
if (inString != null && !inString.equals(""))
{
try
{
_stringValue = inString;
_value = (int) Double.parseDouble(inString.trim());
_format = inFormat;
_valid = true;
}
catch (NumberFormatException nfe) {}
}
}
/**
* Constructor with int vaue
* @param inValue int value of altitude
* @param inFormat format of altitude, either metres or feet
*/
public Altitude(int inValue, Format inFormat)
{
_value = inValue;
_format = inFormat;
_valid = true;
}
/**
* @return an exact copy of this Altitude object
*/
public Altitude clone()
{
return new Altitude(_stringValue, _format);
}
/**
* Reset the altitude parameters to the same as the given object
* @param inClone clone object to copy
*/
public void reset(Altitude inClone)
{
_value = inClone._value;
_format = inClone._format;
_valid = inClone._valid;
}
/**
* @return true if the value could be parsed
*/
public boolean isValid()
{
return _valid;
}
/**
* @return raw value as int
*/
public int getValue()
{
return _value;
}
/**
* @return format of number
*/
public Format getFormat()
{
return _format;
}
/**
* Get the altitude value in the specified format
* @param inFormat desired format, either FORMAT_METRES or FORMAT_FEET
* @return value as an int
*/
public int getValue(Format inFormat)
{
// Note possible rounding errors here if converting to/from units
if (inFormat == _format)
return _value;
if (inFormat == Format.METRES)
return (int) (_value * CONVERT_FEET_TO_METRES);
if (inFormat == Format.FEET)
return (int) (_value * CONVERT_METRES_TO_FEET);
return _value;
}
/**
* Get a string version of the value
* @param inFormat specified format
* @return string value, if possible the original one
*/
public String getStringValue(Format inFormat)
{
if (!_valid) {return "";}
// Return string value if the same format or "no format" was requested
if ((inFormat == _format || inFormat == Format.NO_FORMAT)
&& _stringValue != null && !_stringValue.equals("")) {
return _stringValue;
}
return "" + getValue(inFormat);
}
/**
* 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
Format altFormat = inStart.getFormat();
int startValue = inStart.getValue();
int endValue = inEnd.getValue(altFormat);
// interpolate between start and end
int newValue = startValue + (int) ((endValue - startValue) * inFrac);
return new Altitude(newValue, altFormat);
}
/**
* Add the given offset to the current altitude
* @param inOffset offset as double
* @param inFormat format of offset, feet or metres
* @param inDecimals number of decimal places
*/
public void addOffset(double inOffset, Format inFormat, int inDecimals)
{
// Use the maximum number of decimal places from current value and offset
int numDecimals = NumberUtils.getDecimalPlaces(_stringValue);
if (numDecimals < inDecimals) {numDecimals = inDecimals;}
// Convert offset to correct units
double offset = inOffset;
if (inFormat != _format)
{
if (inFormat == Format.FEET)
offset = inOffset * CONVERT_FEET_TO_METRES;
else
offset = inOffset * CONVERT_METRES_TO_FEET;
}
// Add the offset
double newValue = Double.parseDouble(_stringValue.trim()) + offset;
_value = (int) newValue;
_stringValue = NumberUtils.formatNumber(newValue, numDecimals);
}
}
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