C＃：谷歌地图检查值是否在圈内？ [英] C#: Google map check the value is inside the circle or not..?

问题描述

hi,
 
 
     I need to find the the latitude langitude value is inside the Radius circle or not.if its is outside i have to pass some value from my MVC Controller. 
 
 




i have tried this but data comes wrong distance,

if the distance is acroos from the radius line i have to show some notification. if anybody knows this please help me for the same

Thanks,

我试过的：

What I have tried:

function distance(lat1,lon1,lat2,lon2){
  var R = 6371; // Earth's radius in Km
  return Math.acos(Math.sin(lat1)*Math.sin(lat2) + 
                  Math.cos(lat1)*Math.cos(lat2) *
                  Math.cos(lon2-lon1)) * R;
}


if (distance(user.lat, user.lon, post.lat, post.lon) <= desiredRadiusInKm){
  // return true;
} else {
  // return false;
}

推荐答案

只需获得两点之间的距离，看看它是否在所需的半径范围内。



如果谷歌地图API没有这个功能（如果没有它会让我感到惊讶），你可以使用本文中的类来确定两个GPS点之间的距离。





一个方便的GPS类 [ ^ ]

Simply get the distance between two points, and see if it's within the desired radius.

If the Google Maps API doesn't have a function for that (and it would honestly surprise me if it didn't), you can use the class in this article to determine the distance between two GPS points.


A Handy GPS Class[^]

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