Google maps API - 计算点击区域和常量位置之间的距离

Question

我想计算点击区域和常数位置之间的距离。

我想结合这两段代码，但不知何故我无法做到。

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&libraries=geometry"></script>

<script>
var p1 = new google.maps.LatLng(45.463688, 9.18814);
var p2 = HERE I WOULD LIKE TO HAVE A POSITION OF THE PLACED MARKER;

alert(calcDistance(p1, p2));

//calculates distance between two points in km's
function calcDistance(p1, p2) {
return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
}
</script>

和

google.maps.event.addListener(map, 'click', function(event){
placeMarker(event.latLng);
});

function placeMarker(location) {
var marker = new google.maps.Marker({
    position: location, 
    map: map,
    draggable: true
});
}

Answer 1

看起来你只需要将提醒距离的代码移动到正确的位置......

google.maps.event.addListener(map, 'click', function(event){
    placeMarker(event.latLng);

    var p1 = new google.maps.LatLng(45.463688, 9.18814);

    setTimeout(function() {
        alert(calcDistance(p1, event.latLng));
    }, 500);
});