rectangular geo fence code

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Hi,

I am trying to implement a rectangular geo fence.

I am getting the latitude and longitude co-ordinates from GPS module which gives the current position of the vehicle.
When the vehicle is parked, a virtual fence is activated. The program should check if the vehicle is within the boundary through regular position updates and alert the user in case of fence breach.

Any C code for the above implementation would be very helpful.

Posted 28-Feb-12 18:52pm

kavyabc123

Updated 28-Feb-12 19:25pm

André Kraak

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André Kraak 29-Feb-12 1:25am

Edited question:
Formatted text/code
Removed unnecessary tags

Fredrik Bornander 29-Feb-12 4:17am

Is there a reason the fence has to be rectangular? A circular fence would be simpler (not saying that a rectangular would be that difficult) as the fence is then just a distance.

kavyabc123 1-Mar-12 3:22am

There is no particular reason that the fence has to be rectangular, a circular fence would also suffice. Just trying to figure out the most effective implementation for my project..

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JackDingler · Accepted Answer · 2012-03-01T08:56:00

A rectangular or circular fence would be of similar ease to program.

A fence of an irregular shape would be tougher.

How about....

C++

bool IsInFence(double CurrentX, double CurrentY, double ParkedX, double ParkedY, double FenceDistance)
{
   double dX = CurrentX - ParkedX;
   double dY = CurrentY - ParkedY;
   double Distance = sqrt((dX * dX) + (dY * dY));
   if (Distance > FenceDistance)
      return true;

   return false;
}

I'll leave it up to you to finish the rest of your homework.