问题描述
限时送ChatGPT账号..下面是我想要的结果
我想知道的是:
我使用中心点纬度和半径创建了圆.现在我想知道,如何检查(计算)纬度和经度是在该区域的内部还是外部,如果您能给我 Javascript 中的代码示例,我将不胜感激.我使用的是 Google Maps API V3.
I have created the circle using center point lat lang and radius around it. Now I want to know, how to check (calculate) if a latitude and longitude is either inside or outside the area I would appreciate if you can give me code example in Javascript. I'm using Google Maps API V3.
我发现了这个功能,但没有按预期工作:
function arePointsNear(checkPoint, centerPoint) {
var sw = new google.maps.LatLng(centerPoint.lat() - 0.005, centerPoint.lng() - 0.005);
var ne = new google.maps.LatLng(centerPoint.lat() + 0.005, centerPoint.lng() + 0.005);
var bounds = new google.maps.LatLngBounds(sw, ne);
if (bounds.contains (checkPoint)){
return true;
}
return false;
}
任何帮助都会很棒..提前致谢!!
Any help will be great.. thanks in advance!!
推荐答案
对于如此短的距离,并且当精度不必精确到厘米时,您可以将地球表面视为平坦的.计算中心点纬度处度数到公里的换算,则勾股定理可得用于获取距离:
For such short distances, and when the accuracy doesn't have to be exact to the centimeter, you can treat the surface of the earth as flat. Calculate a conversion from degrees to kilometers at the latitude of the center point, then the Pythagorean theorem can be used to get the distance:
function arePointsNear(checkPoint, centerPoint, km) {
var ky = 40000 / 360;
var kx = Math.cos(Math.PI * centerPoint.lat / 180.0) * ky;
var dx = Math.abs(centerPoint.lng - checkPoint.lng) * kx;
var dy = Math.abs(centerPoint.lat - checkPoint.lat) * ky;
return Math.sqrt(dx * dx + dy * dy) <= km;
}
演示:http://jsfiddle/Guffa/57gQa/
注意:如果您传递的是 0/360 经度,则代码不会考虑在内.如果是这种情况,您必须先对经度进行归一化.
Note: The code doesn't take into consideration if you are passing the 0/360 longitude. If that is the case, you would have to normalize the longitudes first.
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