//public String replace(String s, String one, String another) {
// // In a string replace one substring with another
// if (s.Equals(""))
// return "";
// String res = "";
// int i = s.IndexOf(one, 0);
// int lastpos = 0;
// while (i != -1) {
// res += s.Substring(lastpos, i) + another;
// lastpos = i + one.Length();
// i = s.IndexOf(one, lastpos);
// }
// res += s.Substring(lastpos); // the rest
// return res;
//}
/**
* distance(p0, p1, p2) computes the distance between the point p0 and the
* segment [p1,p2]. This could probably be replaced with something that is a
* bit more numerically stable.
*
* @param p0
* @param p1
* @param p2
* @return
*/
public double distance(Trackpoint p0, Trackpoint p1, Trackpoint p2)
{
double u, result = 0.0;
if (p1.getLatDouble() == p2.getLatDouble() &&
p1.getLonDouble() == p2.getLonDouble())
{
result = Math.Sqrt(Math.Pow(p2.getLatDouble() - p0.getLatDouble(), 2)
+ Math.Pow(p2.getLonDouble() - p0.getLonDouble(), 2));
}
else
{
u = ((p0.getLatDouble() - p1.getLatDouble())
* (p2.getLatDouble() - p1.getLatDouble()) + (p0
.getLonDouble() - p1.getLonDouble())
* (p2.getLonDouble() - p1.getLonDouble()))
/ (Math.Pow(p2.getLatDouble() - p1.getLatDouble(), 2) + Math
.Pow(p2.getLonDouble() - p1.getLonDouble(), 2));
if (u <= 0)
{
result = Math.Sqrt(Math.Pow(p0.getLatDouble() - p1.getLatDouble(),
2)
+ Math.Pow(p0.getLonDouble() - p1.getLonDouble(), 2));
}
if (u >= 1)
{
result = Math.Sqrt(Math.Pow(p0.getLatDouble() - p2.getLatDouble(),
2)
+ Math.Pow(p0.getLonDouble() - p2.getLonDouble(), 2));
}
if (0 < u && u < 1)
{
result = Math.Sqrt(Math.Pow(p0.getLatDouble() - p1.getLatDouble()
- u * (p2.getLatDouble() - p1.getLatDouble()), 2)
+ Math.Pow(p0.getLonDouble() - p1.getLonDouble() - u
* (p2.getLonDouble() - p1.getLonDouble()), 2));
}
}
return(result);
}
private String createEncodings(List <Trackpoint> points, double[] dists)
{
StringBuilder encodedPoints = new StringBuilder();
double maxlat = 0, minlat = 0, maxlon = 0, minlon = 0;
int plat = 0;
int plng = 0;
for (int i = 0; i < points.Count; i++)
{
// determin bounds (max/min lat/lon)
if (i == 0)
{
maxlat = minlat = points[i].getLatDouble();
maxlon = minlon = points[i].getLonDouble();
}
else
{
if (points[i].getLatDouble() > maxlat)
{
maxlat = points[i].getLatDouble();
}
else if (points[i].getLatDouble() < minlat)
{
minlat = points[i].getLatDouble();
}
else if (points[i].getLonDouble() > maxlon)
{
maxlon = points[i].getLonDouble();
}
else if (points[i].getLonDouble() < minlon)
{
minlon = points[i].getLonDouble();
}
}
if (dists[i] != 0 || i == 0 || i == points.Count - 1)
{
Trackpoint point = points[i];
int late5 = floor1e5(point.getLatDouble());
int lnge5 = floor1e5(point.getLonDouble());
int dlat = late5 - plat;
int dlng = lnge5 - plng;
plat = late5;
plng = lnge5;
encodedPoints.Append(encodeSignedNumber(dlat));
encodedPoints.Append(encodeSignedNumber(dlng));
}
}
Dictionary <String, Double> bounds = new Dictionary <String, Double>();
bounds.Add("maxlat", maxlat);
bounds.Add("minlat", minlat);
bounds.Add("maxlon", maxlon);
bounds.Add("minlon", minlon);
this.setBounds(bounds);
return(encodedPoints.ToString());
}