/// <summary>
/// This method visits a KML Polygon element
/// </summary>
/// <param name="elem">KML Polygon element to be visited</param>
protected void VisitPolygon(XmlElement elem)
{
if (elem == null)
{
return;
}
#region Extract Outer Border
XmlElement outerBoundaryIs = GetFirstChild(elem, "outerBoundaryIs");
if (outerBoundaryIs == null)
{
return;
}
XmlElement outerLinearRing = GetFirstChild(outerBoundaryIs, "LinearRing");
if (outerLinearRing == null)
{
return;
}
int numOfGeographiesBefore = this.Geographies.Count;
VisitLinearRing(outerLinearRing);
int numOfGeographiesAfter = this.Geographies.Count;
// Extracts the outer ring
if (numOfGeographiesAfter == numOfGeographiesBefore)
{
throw new KMLException("Outer ring not found!");
}
int index = this.Geographies.Count - 1;
Geography g = this.Geographies[index];
this.m_Geographies.RemoveAt(index);
LinearRing outerRing = g as LinearRing;
if (outerRing == null)
{
throw new KMLException("Outer ring not created!");
}
Polygon polygon = new Polygon();
bool isValidPolygon = true;
#region Check outer ring orientation. Outer boundary should be oriented counter-clockwise
if (!outerRing.IsValid)
{
// Checks if just the ring's orientation is wrong
outerRing.SwitchOrientation();
if (!outerRing.IsValid)
{
isValidPolygon = false;
outerRing.SwitchOrientation();
}
}
#endregion
polygon.OuterRing = outerRing;
#endregion
#region Extract Inner Borders
XmlNodeList innerBoundaryIsLst = elem.GetElementsByTagName("innerBoundaryIs");
if (innerBoundaryIsLst != null)
{
foreach (XmlNode innerBorderNode in innerBoundaryIsLst)
{
XmlElement innerBoundaryIs = innerBorderNode as XmlElement;
if (innerBoundaryIs == null)
{
continue;
}
XmlElement innerLinearRing = GetFirstChild(innerBoundaryIs, "LinearRing");
if (innerLinearRing == null)
{
continue;
}
numOfGeographiesBefore = this.Geographies.Count;
VisitLinearRing(innerLinearRing);
numOfGeographiesAfter = this.Geographies.Count;
// Extracts the inner ring
if (numOfGeographiesBefore == numOfGeographiesAfter)
{
throw new KMLException("Inner ring not found!");
}
index = this.Geographies.Count - 1;
g = this.Geographies[index];
this.m_Geographies.RemoveAt(index);
LinearRing innerRing = g as LinearRing;
if (innerRing == null)
{
throw new KMLException("Inner ring not created!");
}
#region Check the ring's orientation. Inner rings should be clockwise oriented
if (isValidPolygon)
{
if (innerRing.IsValid)
{
// The inner rings should be in the opposite direction from the outer ring
innerRing.SwitchOrientation();
}
}
#endregion
polygon.InnerRing.Add(innerRing);
}
}
#endregion
// Extracts the other non-geographic data
VisitGeography(elem, polygon);
#region Extract altitude mode
int?altitudeModeCode = GetAltitudeModeCode(elem);
if (altitudeModeCode.HasValue)
{
// Updates all the points on the outer bound
if (polygon.OuterRing != null)
{
foreach (Point p in polygon.OuterRing.Points)
{
p.Measure = altitudeModeCode;
}
}
// Update all the points on all the inner bounds
if (polygon.InnerRing != null)
{
foreach (LinearRing r in polygon.InnerRing)
{
if (r.Points == null)
{
return;
}
foreach (Point p1 in r.Points)
{
p1.Measure = altitudeModeCode;
}
}
}
}
#endregion
#region Handles tesselate flag
if (polygon.Tesselate)
{
if (polygon.OuterRing != null)
{
polygon.OuterRing.StoreTesselateFlag();
}
if (polygon.InnerRing != null)
{
foreach (LinearRing r in polygon.InnerRing)
{
r.StoreTesselateFlag();
}
}
}
#endregion
// Sets the geography instance context
polygon.Context = (elem.ParentNode != null) ? elem.ParentNode.OuterXml : elem.OuterXml;
m_Geographies.Add(polygon);
}
/// <summary>
/// This method visits a KML LineString element
/// </summary>
/// <param name="elem">KML line string element to be visited</param>
/// <param name="isLineRing">True if the line is the ring</param>
protected void VisitLineString(
XmlElement elem,
bool isLineRing)
{
if (elem == null)
{
return;
}
XmlNode coordinates = GetFirstChild(elem, "coordinates");
if (coordinates == null || !coordinates.HasChildNodes)
{
return;
}
XmlNode txt = coordinates.ChildNodes[0];
string allCoordinates = txt.InnerText;
IList <Point> points = ParseCoordinates(allCoordinates);
if (points == null || points.Count == 0)
{
return;
}
LineString ls = null;
if (isLineRing)
{
ls = new LinearRing();
}
else
{
ls = new LineString();
}
ls.Points.AddRange(points);
int?altitudeModeCode = GetAltitudeModeCode(elem);
foreach (Point p in ls.Points)
{
p.Measure = altitudeModeCode;
}
// Extract other non-geographic data
VisitGeography(elem, ls);
#region Handle tesselate flag
ls.StoreTesselateFlag();
#endregion
// Sets the geography instance context
ls.Context = (elem.ParentNode != null) ? elem.ParentNode.OuterXml : elem.OuterXml;
m_Geographies.Add(ls);
}
