/// <summary>
/// Create a geodetic ellipse
/// </summary>
private IGeometry DrawEllipse()
{
try
{
var ellipticArc = (IConstructGeodetic) new Polyline();
double bearing;
if (AzimuthType == AzimuthTypes.Mils)
{
bearing = GetAzimuthAsDegrees();
}
else
{
bearing = Azimuth;
}
ellipticArc.ConstructGeodesicEllipse(Point1, GetLinearUnit(), MajorAxisDistance, MinorAxisDistance, bearing, esriCurveDensifyMethod.esriCurveDensifyByAngle, 0.01);
var line = ellipticArc as IPolyline;
if (line != null)
{
var color = (IColor) new RgbColorClass()
{
Red = 255
};
IDictionary <String, System.Object> ellipseAttributes = new Dictionary <String, System.Object>();
ellipseAttributes.Add("majoraxis", MajorAxisDistance);
ellipseAttributes.Add("minoraxis", MinorAxisDistance);
ellipseAttributes.Add("azimuth", Azimuth);
ellipseAttributes.Add("centerx", Point1.X);
ellipseAttributes.Add("centery", Point1.Y);
ellipseAttributes.Add("distanceunit", LineDistanceType.ToString());
ellipseAttributes.Add("angleunit", AzimuthType.ToString());
AddGraphicToMap((IGeometry)line, color, attributes: ellipseAttributes);
//Convert ellipse polyline to polygon
var newPoly = PolylineToPolygon((IPolyline)ellipticArc);
if (newPoly != null)
{
//Get centroid of polygon
var area = newPoly as IArea;
//Add text using centroid point
DistanceTypes dtVal = (DistanceTypes)LineDistanceType; //Get line distance type
AzimuthTypes atVal = (AzimuthTypes)AzimuthType; //Get azimuth type
EllipseTypes ellipseType = EllipseType;
double majAxisDist = majorAxisDistance * 2;
double minAxisDist = minorAxisDistance * 2;
if (area != null)
{
AddTextToMap(area.LabelPoint, string.Format("{0}:{1} {2}{3}{4}:{5} {6}{7}{8}:{9} {10}",
"Major Axis",
Math.Round(majAxisDist, 2),
dtVal.ToString(),
Environment.NewLine,
"Minor Axis",
Math.Round(minAxisDist, 2),
dtVal.ToString(),
Environment.NewLine,
"Orientation Angle",
Math.Round(azimuth, 2),
atVal.ToString()));
}
}
}
return((IGeometry)line);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
return(null);
}
}
