public double CalculateDistanceOfNextStep(LatLng CurrentLocation, int index, DirectionStep step)
{
if (index >= step.PolyLineIndex)
{
return(0);
}
double d = 0;
for (int i = index + 1; i < (step.PolyLineIndex); i++)
{
if (i + 1 < Points.Count)
{
d += util.GetDistanceBetweenPoints(Points[i], Points[i + 1]);
}
}
d += util.GetDistanceBetweenPoints(CurrentLocation, Points[index + 1]);
return(d);
}
public DirectionStep GetDirectionNextStep(int PolyLineIndex)
{
if (PolyLineIndex < 0 || PolyLineIndex >= this.Points.Count)
{
return(null);
}
DirectionStep step = null;
foreach (DirectionStep stp in this.Steps)
{
if (stp.PolyLineIndex > PolyLineIndex)
{
return(stp);
}
step = stp;
}
return(null);
}
public string GetDirectionDiscriptionFromLocation(LatLng loc)
{
int index = GetNearestPolyIndex(loc);
if (index < 0)
{
string Description = "You've lost your way!!!!";
if (!isLostWay)
{
#if SPEECH_ENABLED
speaker.SpeakAsync(Description);
#endif
isLostWay = true;
}
return(Description);
}
else
{
DirectionStep step = GetDirectionNextStep(index);
isLostWay = false;
if (step != null)
{
double distance = CalculateDistanceOfNextStep(loc, index, step);
string str_dis;
if (distance < 1)
{
str_dis = " in " + String.Format("{0:0}", distance * 1000) + " Meters";
}
else
{
str_dis = " in " + String.Format("{0:0.0}", distance) + " KiloMeters";
}
string Description = step.step_description + str_dis;
if (!step.far_speech)
{
#if SPEECH_ENABLED
speaker.SpeakAsync(Description);
#endif
if (distance * 1000 < 300)
{
step.near_speech = true;
}
step.far_speech = true;
}
if (distance * 1000 < 300 && step.near_speech == false)
{
step.near_speech = true;
#if SPEECH_ENABLED
speaker.SpeakAsync(Description);
#endif
}
return(Description);
}
else
{
isLostWay = true;
double distance = util.GetDistanceBetweenPoints(loc, Points[Points.Count - 1]);
string str_dis;
if (distance < 1)
{
str_dis = "in " + String.Format("{0:0}", distance * 1000) + " Meters";
}
else
{
str_dis = "in " + String.Format("{0:0.0}", distance) + " KiloMeters";
}
string Description = "Arrive " + str_dis;
if (distance * 1000 < 500)
{
if (!isArrived)
{
#if SPEECH_ENABLED
speaker.SpeakAsync(Description);
#endif
}
}
isArrived = true;
return(Description);
}
}
}