javascript 如何计算折线距离？
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how to calculate polyline distance?
提问by user2232995
function createLine()
{
geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(7.5653, 80.4303);
var mapOptions = {
zoom: 8,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("directionpanel"), mapOptions);
var address = document.getElementById('startvalue').value;
var address2 = document.getElementById('endvalue').value;
var temp, temp2;
geocoder.geocode({ 'address': address }, function (results, status) {
temp = results[0].geometry.location;
geocoder.geocode({ 'address': address2 }, function (results, status) {
temp2 = results[0].geometry.location;
var route = [
temp,
temp2
];
var polyline = new google.maps.Polyline({
path: route,
strokeColor: "#ff0000",
strokeOpacity: 0.6,
strokeWeight: 5
});
polyline.setMap(map);
});
});
}
This code work fine. I want to calculate the distance of the line which I created. I want to display this value in meters via an alert. Please help me... (In this case two points connect directly with the line. I want to calculate that direct line distance. )
这段代码工作正常。我想计算我创建的线的距离。我想通过警报以米为单位显示此值。请帮帮我...（在这种情况下，两点直接与直线相连。我想计算直线距离。）
回答by geocodezip
Use google.maps.geometry.spherical.computeLength(be sure to include the geometry library)
使用google.maps.geometry.sphereal.computeLength（确保包含几何库）
function createLine()
{
geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(7.5653, 80.4303);
var mapOptions = {
zoom: 8,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("directionpanel"), mapOptions);
var address = document.getElementById('startvalue').value;
var address2 = document.getElementById('endvalue').value;
var temp, temp2;
geocoder.geocode({ 'address': address }, function (results, status) {
temp = results[0].geometry.location;
geocoder.geocode({ 'address': address2 }, function (results, status) {
temp2 = results[0].geometry.location;
var route = [
temp,
temp2
];
var polyline = new google.maps.Polyline({
path: route,
strokeColor: "#ff0000",
strokeOpacity: 0.6,
strokeWeight: 5
});
var lengthInMeters = google.maps.geometry.spherical.computeLength(polyline.getPath());
alert("polyline is "+lengthInMeters+" long");
polyline.setMap(map);
});
});
}
Working example(updated the example from your last question to include the length calculation)
工作示例（更新了您上一个问题中的示例以包括长度计算）
