/// <summary>
/// Retrieves the angular type based on the esriSRUnit type
/// </summary>
/// <param name="angularUnitFactoryCode">factory unit code for the map</param>
/// <returns>AngularTypes unit type</returns>
private AngularTypes GetAngularType(int angularUnitFactoryCode)
{
// default to degrees
AngularTypes angularType = AngularTypes.DEGREES;
switch (angularUnitFactoryCode)
{
case (int)esriSRUnitType.esriSRUnit_Degree:
angularType = AngularTypes.DEGREES;
break;
case (int)esriSRUnitType.esriSRUnit_Grad:
angularType = AngularTypes.GRADS;
break;
case (int)esriSRUnitType.esriSRUnit_Mil6400:
angularType = AngularTypes.MILS;
break;
default:
angularType = AngularTypes.DEGREES;
break;
}
return(angularType);
}
/// <summary>
/// Method to get an angular distance in the correct units for the map
/// </summary>
/// <param name="map">IMap</param>
/// <param name="inputDistance">the input distance</param>
/// <param name="distanceType">the "from" distance unit type</param>
/// <returns></returns>
private double GetAngularDistance(IMap map, double inputDistance, AngularTypes angularType)
{
if (SelectedSurfaceSpatialRef == null)
{
return(inputDistance);
}
AngularTypes angularDistanceTo = AngularTypes.DEGREES; // default to degrees
var gcs = SelectedSurfaceSpatialRef as IGeographicCoordinateSystem;
if (gcs != null)
{
angularDistanceTo = GetAngularType(gcs.CoordinateUnit.FactoryCode);
}
var result = GetAngularDistanceFromTo(angularType, angularDistanceTo, inputDistance);
return(result);
}
/// <summary>
/// Method to convert to/from different types of angular units
/// </summary>
/// <param name="fromType">DistanceTypes</param>
/// <param name="toType">DistanceTypes</param>
private double GetAngularDistanceFromTo(AngularTypes fromType, AngularTypes toType, double input)
{
double angularDistance = input;
try
{
if (fromType == AngularTypes.DEGREES && toType == AngularTypes.GRADS)
{
angularDistance *= 1.11111;
}
else if (fromType == AngularTypes.DEGREES && toType == AngularTypes.MILS)
{
angularDistance *= 17.777777777778;
}
else if (fromType == AngularTypes.GRADS && toType == AngularTypes.DEGREES)
{
angularDistance /= 1.11111;
}
else if (fromType == AngularTypes.GRADS && toType == AngularTypes.MILS)
{
angularDistance *= 16;
}
else if (fromType == AngularTypes.MILS && toType == AngularTypes.DEGREES)
{
angularDistance /= 17.777777777778;
}
else if (fromType == AngularTypes.MILS && toType == AngularTypes.GRADS)
{
angularDistance /= 16;
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
return(angularDistance);
}
// TODO: Move repeated method GetAngularDistanceFromTo to common visibility library
/// <summary>
/// Method to convert to/from different types of angular units
/// </summary>
/// <param name="fromType">DistanceTypes</param>
/// <param name="toType">DistanceTypes</param>
private double GetAngularDistanceFromTo(AngularTypes fromType, AngularTypes toType, double input)
{
double angularDistance = input;
try
{
if (fromType == AngularTypes.DEGREES && toType == AngularTypes.GRADS)
{
angularDistance *= 1.11111;
}
else if (fromType == AngularTypes.DEGREES && toType == AngularTypes.MILS)
{
angularDistance *= 17.777777777778;
}
else if (fromType == AngularTypes.GRADS && toType == AngularTypes.DEGREES)
{
angularDistance /= 1.11111;
}
else if (fromType == AngularTypes.GRADS && toType == AngularTypes.MILS)
{
angularDistance *= 16;
}
else if (fromType == AngularTypes.MILS && toType == AngularTypes.DEGREES)
{
angularDistance /= 17.777777777778;
}
else if (fromType == AngularTypes.MILS && toType == AngularTypes.GRADS)
{
angularDistance /= 16;
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
}
return(Math.Round(angularDistance, 1));
}
/// <summary>
/// Method to convert to/from different types of angular units
/// </summary>
/// <param name="fromType">DistanceTypes</param>
/// <param name="toType">DistanceTypes</param>
private double GetAngularDistanceFromTo(AngularTypes fromType, AngularTypes toType, double input)
{
double angularDistance = input;
try
{
if (fromType == AngularTypes.DEGREES && toType == AngularTypes.GRADS)
angularDistance *= 1.11111;
else if (fromType == AngularTypes.DEGREES && toType == AngularTypes.MILS)
angularDistance *= 17.777777777778;
else if (fromType == AngularTypes.GRADS && toType == AngularTypes.DEGREES)
angularDistance /= 1.11111;
else if (fromType == AngularTypes.GRADS && toType == AngularTypes.MILS)
angularDistance *= 16;
else if (fromType == AngularTypes.MILS && toType == AngularTypes.DEGREES)
angularDistance /= 17.777777777778;
else if (fromType == AngularTypes.MILS && toType == AngularTypes.GRADS)
angularDistance /= 16;
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
return angularDistance;
}
/// <summary>
/// Method to get an angular distance in the correct units for the map
/// </summary>
/// <param name="map">IMap</param>
/// <param name="inputDistance">the input distance</param>
/// <param name="distanceType">the "from" distance unit type</param>
/// <returns></returns>
private double GetAngularDistance(IMap map, double inputDistance, AngularTypes angularType)
{
if (map.SpatialReference == null)
return inputDistance;
AngularTypes angularDistanceTo = AngularTypes.DEGREES; // default to degrees
var gcs = map.SpatialReference as IGeographicCoordinateSystem;
if (gcs != null)
{
angularDistanceTo = GetAngularType(gcs.CoordinateUnit.FactoryCode);
}
var result = GetAngularDistanceFromTo(angularType, angularDistanceTo, inputDistance);
return result;
}