矩形地理围栏代码 [英] rectangular geo fence code

问题描述

我正在尝试实现矩形的地理围栏.

我正在从GPS模块获取纬度和经度坐标，该坐标给出了车辆的当前位置.
停车时，将激活虚拟围栏.该程序应通过定期更新位置来检查车辆是否在边界内，并在发生围栏破坏时提醒用户.

用于上述实现的任何C代码都将非常有帮助.

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.

推荐答案

矩形或圆形围栏与编程相似.

不规则形状的围栏会更坚固.

怎么样....

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

A fence of an irregular shape would be tougher.

How about....

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;
}

我会把剩下的功课交给你.

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

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