/// <summary>
/// add a point to the ring
/// </summary>
/// <param name="longitude"></param>
/// <param name="latitude"></param>
/// <param name="altitude"></param>
public void Add(float longitude, float latitude, float altitude)
{
kmlPoint pt = new kmlPoint();
pt.longitude = longitude;
pt.latitude = latitude;
pt.altitude = altitude;
Add(pt);
}
/// <summary>
/// relocate the line at the new position
/// </summary>
/// <param name="longitude"></param>
/// <param name="latitude"></param>
public void Relocate(float longitude, float latitude)
{
// adjust the position of each point relative to the centre
for (int i = 0; i < Points.Count; i++)
{
kmlPoint pt = (kmlPoint)Points[i];
pt.longitude += longitude - centre_longitude;
pt.latitude += latitude - centre_latitude;
}
updateCentrePoint();
}
/// <summary>
/// recalculate the centre point of the ring
/// </summary>
private void updateCentrePoint()
{
if (Points.Count > 0)
{
float tot_x = 0;
float tot_y = 0;
for (int i = 0; i < Points.Count; i++)
{
kmlPoint pt = (kmlPoint)Points[i];
tot_x += pt.longitude;
tot_y += pt.latitude;
}
centre_longitude = tot_x / Points.Count;
centre_latitude = tot_y / Points.Count;
}
}
/// <summary>
/// return an xml element
/// </summary>
/// <param name="doc">xml document to add the data to</param>
/// <returns>an xml element</returns>
public XmlElement getXml(XmlDocument doc)
{
String coords = "";
for (int i = 0; i < Points.Count; i++)
{
kmlPoint pt = (kmlPoint)Points[i];
coords += "\r\n" +
Convert.ToString(pt.longitude) + "," +
Convert.ToString(pt.latitude) + "," +
Convert.ToString(pt.altitude) + ",";
}
coords += "\r\n";
XmlElement elem = doc.CreateElement("LinearRing");
doc.DocumentElement.AppendChild(elem);
xml.AddTextElement(doc, elem, "coordinates", coords);
return(elem);
}
/// <summary>
/// returns true if the given location is inside the ring
/// </summary>
/// <param name="longitude"></param>
/// <param name="latitude"></param>
/// <returns>true if the given location is inside this ring</returns>
public bool isInside(float longitude, float latitude)
{
bool inside = false;
int i, j;
for (i = 0, j = Points.Count - 1; i < Points.Count; j = i++)
{
kmlPoint pt1 = (kmlPoint)Points[i];
kmlPoint pt2 = (kmlPoint)Points[j];
if ((((pt1.latitude <= latitude) && (latitude < pt2.latitude)) ||
((pt2.latitude <= latitude) && (latitude < pt1.latitude))) &&
(longitude < (pt2.longitude - pt1.longitude) * (latitude - pt1.latitude) /
(pt2.latitude - pt1.latitude) + pt1.longitude))
{
inside = !inside;
}
}
return(inside);
}
/// <summary>
/// add a point to the ring
/// </summary>
/// <param name="pt"></param>
public void Add(kmlPoint pt)
{
Points.Add(pt);
updateCentrePoint();
}
/// <summary>
/// add a point to the ring
/// </summary>
/// <param name="longitude"></param>
/// <param name="latitude"></param>
/// <param name="altitude"></param>
public void Add(float longitude, float latitude, float altitude)
{
kmlPoint pt = new kmlPoint();
pt.longitude = longitude;
pt.latitude = latitude;
pt.altitude = altitude;
Add(pt);
}
/// <summary>
/// add a point to the ring
/// </summary>
/// <param name="pt"></param>
public void Add(kmlPoint pt)
{
Points.Add(pt);
updateCentrePoint();
}
