このフォーラムでの助けに感謝します。開始点と多くのマーカーの間の最短ルートを検索するという課題をほぼ完了しました。しかし、私の距離測定は単純に Haversine 式を採用しているだけで、2 点間の実際のルーティング距離を示していません。DirectionServices を使用して 2 点間の最短距離を取得するために、Google マップで既に機能している以前に開発された関数を組み合わせようとしています。以下のホームページから、各ルートの距離を計算する方法を見つけました。 http://ratan.com.np/calculate-distance-location-longitude-latitude-google-maps-v3-route/
コードを繰り返しチェックしましたが、コードが失敗した理由はまだわかりません...構文エラー「予期しないトークン<」が返されました....
誰でもコードを見るのを手伝ってもらえますか...私の改訂されたプログラムの概念的な間違いを確認するために....多くの感謝...
ボタンをクリックして「Submit2()」関数を呼び出します
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var origin = null;
var destination = null;
var markersArray = [];
var start_lat = null;
var start_long = null;
var end_lat = null;
var end_long = null;
var station_num = null;
var trig_name = null;
var total_dist;
var closest_dist;
var closest_marker;
var Submit2=function() {
var URL2="Search_nearest_trig_advanced.php"; //Call another PHP to load all markers in JSON format
$.ajax({
url: URL2,
type: "POST",
dataType: "json",
success: function(data){
$.each(data, function(i, item) {
start_lat = item.start_lat; //Return the Lat, Lng of the Starting point from Textbox
start_long = item.start_long;
station_num = item.station_num;
trig_name = item.trig_name;
end_lat = item.end_lat;
end_long = item.end_long;
origin = new google.maps.LatLng(start_lat, start_long); //Origin and Destination parameters are used for Google Direction Services
destination = new google.maps.LatLng(end_lat, end_long);
marker = new google.maps.Marker({
map: map,
position: destination,
icon: trigicon,
title: trig_name
})
markersArray.push(marker);
calcRoute2(); //find the total distance 'total_dist' for each route
if (total_dist > closest_dist) { //Replace the closest_marker by the one with shorter distance
closest_dist = total;
closest_marker.setMap(null);
closest_marker = marker;
}
});
},
error:function(xhr, ajaxOptions, thrownError){
alert(xhr.status);
alert(thrownError);
}
});
destination = closest_marker.getPosition();
calcRoute(); //the original method to show the route
};
calcRoute() 関数を呼び出してルート距離を計算します
function calcRoute2() {
document.getElementById("directions_panel").innerHTML = "";
directionsDisplay = new google.maps.DirectionsRenderer({
'map': map,
'preserveViewport': false, //Google Map will change the zoom extent to match with the Direction route if set false
'draggable': true
});
var request = {
origin: origin,
destination: destination,
waypoints: waypoints,
travelMode: google.maps.DirectionsTravelMode.DRIVING,
optimizeWaypoints: document.getElementById('optimize').checked,
avoidHighways: document.getElementById('highways').checked,
avoidTolls: document.getElementById('tolls').checked
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
computeTotalDistance(response);
}
});
directionsVisible = false;
}
function computeTotalDistance(result) {
var total_dist = 0;
var myroute = result.routes[0];
for (i = 0; i < myroute.legs.length; i++) {
total_dist += myroute.legs[i].distance.value;
}
total_dist = total_dist / 1000 // the distance output is converted to KiloMeter
}
「search_nearest_trig_advanced.php」
<?php
require_once "dbconnect.php";
require_once "hk1980.php";
$coor_x = $_POST['hk80_x'];
$coor_y = $_POST['hk80_y'];
/* Connect to the MySQL database. */
if (!($connection = @ mysql_connect($remotehost, $username, $password)))
die("Connection failed");
if (!(mysql_select_db($database, $connection)))
die("Couldn't select testing database");
// Run the query on the connection
$sql_query = "Select station_num, trig_name, X(trig_xy_pos) as X_Coor, Y(trig_xy_pos) as Y_Coor From trig_station";
if (!($sql_result = @ mysql_query($sql_query, $connection)))
die("Couldn't run query");
while ($row = @ mysql_fetch_array($sql_result, MYSQL_ASSOC))
{
$start_east = floatval($coor_x);
$start_north = floatval($coor_y);
$hk1980_start = array($start_east, $start_north);
$end_east = floatval($row['X_Coor']);
$end_north = floatval($row['Y_Coor']);
$hk1980_end = array($end_east,$end_north);
$wgs84_start = hk1980_to_wgs84($hk1980_start[1],$hk1980_start[0],2);
$wgs84_end = hk1980_to_wgs84($hk1980_end[1],$hk1980_end[0],2);
$row_set[] = array("start_lat" => $wgs84_start[0], "start_long" => $wgs84_start[1], "station_num" => $row['station_num'],"trig_name" => $row['trig_name'],"end_lat" => $wgs84_end[0],"end_long" => $wgs84_end[1]);
}
echo json_encode($row_set);
?>