谷歌地图中路线的中点 [英] Midpoint of route in google maps

问题描述

我想知道是否有人知道如何使用谷歌地图 api 找到两个地方之间路线的中点.我不想要地理中心，而是想要沿行驶距离的中点.我是 Javascript 和 google maps api 的新手，因此如果您可以在答案中包含演示或一些代码，那将非常有帮助.最终结果将输出纬度和经度，并表示类似于本网站的内容:

 var directionDisplay;var directionService = new google.maps.DirectionsService();无功地图；var polyline = null;var infowindow = new google.maps.InfoWindow();函数 createMarker(latlng, label, html) {var contentString = '<b>'+label+'</b><br>'+html;var 标记 = 新的 google.maps.Marker({位置:latlng，地图:地图，标题:标签，zIndex:Math.round(latlng.lat()*-100000)<<5});标记.我的名字 = 标签；google.maps.event.addListener(marker, 'click', function() {infowindow.setContent(contentString+"
"+marker.getPosition().toUrlValue(6));infowindow.open(地图，标记)；});返回标记；}函数初始化(){方向显示 = 新的 google.maps.DirectionsRenderer({suppressMarkers:true});var 芝加哥 = 新 google.maps.LatLng(41.850033, -87.6500523);var myOptions = {变焦:6，mapTypeId: google.maps.MapTypeId.ROADMAP,中心:芝加哥}map = new google.maps.Map(document.getElementById(map_canvas"), myOptions);折线 = 新的 google.maps.Polyline({小路: []，中风颜色:'#FF0000'，行程重量:3});DirectionsDisplay.setMap(地图);calcRoute();}函数 calcRoute() {var start = document.getElementById(start").value;var end = document.getElementById("end").value;var travelMode = google.maps.DirectionsTravelMode.DRIVING无功请求 = {起源:开始，目的地:结束，旅行模式:旅行模式};路线Service.route(请求，功能(响应，状态){如果(状态 == google.maps.DirectionsStatus.OK){polyline.setPath([]);var bounds = new google.maps.LatLngBounds();startLocation = new Object();endLocation = new Object();DirectionsDisplay.setDirections(响应)；var route = response.routes[0];var summaryPanel = document.getElementById(directions_panel");summaryPanel.innerHTML = "";//对于每个路由，显示摘要信息.var path = response.routes[0].overview_path;var 腿 = response.routes[0].legs;for (i=0;i

代码片段:

var directionDisplay;var directionService = new google.maps.DirectionsService();无功地图；var polyline = null;var infowindow = new google.maps.InfoWindow();函数 createMarker(latlng, label, html) {var contentString = ''+ 标签 + '</b><br>'+ html;var 标记 = 新的 google.maps.Marker({位置:latlng，地图:地图，标题:标签，zIndex: Math.round(latlng.lat() * -100000) <<5});标记.我的名字 = 标签；google.maps.event.addListener(marker, 'click', function() {infowindow.setContent(contentString + "
" + marker.getPosition().toUrlValue(6));infowindow.open(地图，标记)；});返回标记；}函数初始化(){方向显示 = 新的 google.maps.DirectionsRenderer({抑制标记:真});var 芝加哥 = 新 google.maps.LatLng(41.850033, -87.6500523);var myOptions = {变焦:6，mapTypeId: google.maps.MapTypeId.ROADMAP,中心:芝加哥}map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);折线 = 新的 google.maps.Polyline({小路: []，中风颜色:'#FF0000'，行程重量:3});DirectionsDisplay.setMap(地图);calcRoute();}函数 calcRoute() {var start = document.getElementById("start").value;var end = document.getElementById("end").value;var travelMode = google.maps.DirectionsTravelMode.DRIVING无功请求 = {起源:开始，目的地:结束，旅行模式:旅行模式};路线Service.route(请求，功能(响应，状态){如果(状态 == google.maps.DirectionsStatus.OK){polyline.setPath([]);var bounds = new google.maps.LatLngBounds();startLocation = new Object();endLocation = new Object();DirectionsDisplay.setDirections(响应)；var route = response.routes[0];var summaryPanel = document.getElementById("directions_panel");summaryPanel.innerHTML = "";//对于每个路由，显示摘要信息.var path = response.routes[0].overview_path;var 腿 = response.routes[0].legs;for (i = 0; i  总时间为:" + (totalTime/60).toFixed(2) + "minutes";}功能 putMarkerOnRoute(百分比){var 距离 = (百分比/100) * totalDist;var time = ((percentage/100) * totalTime/60).toFixed(2);如果(！标记){标记 = createMarker(polyline.GetPointAtDistance(distance), "time:" + time, "marker");} 别的 {标记.setPosition(polyline.GetPointAtDistance(distance));标记.setTitle("时间:" + 时间);}}google.maps.event.addDomListener(window, 'load', initialize);//来自 http://www.geocodezip.com/scripts/v3_epoly.js，修改为使用几何库//=== 一种返回沿路径给定距离的点的 GLatLng 的方法 ===//=== 如果路径短于指定距离则返回 null ===google.maps.Polyline.prototype.GetPointAtDistance = 函数(米){//一些尴尬的特殊情况if (metres == 0) 返回 this.getPath().getAt(0);如果(米＜0)返回空值；如果 (this.getPath().getLength() <2) 返回空值；无功分布= 0;var olddist = 0;对于 (var i = 1;(i < this.getPath().getLength() && dist < 米);我++) {olddist = dist;dist += google.maps.geometry.sphereal.computeDistanceBetween(this.getPath().getAt(i), this.getPath().getAt(i - 1));}如果(距离＜米){返回空；}var p1 = this.getPath().getAt(i - 2);var p2 = this.getPath().getAt(i - 1);var m = (米 - olddist)/(dist - olddist);返回新的 google.maps.LatLng(p1.lat() + (p2.lat() - p1.lat()) * m, p1.lng() + (p2.lng() - p1.lng()) *米);}

html {高度:100%}身体 {高度:100%；边距:0px；填充:0px}

<script type="text/javascript" src="http://maps.google.com/maps/api/js?键=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=geometry"></script><div id="工具">开始:<input type="text" name="start" id="start" value="海得拉巴"/>结尾:<input type="text" name="end" id="end" value="Bangalore"/><input type="submit" onclick="calcRoute();"/><br/>

<div id="map_canvas" style="float:left;width:70%;height:80%;"></div><div id="control_panel" style="float:right;width:30%;text-align:left;padding-top:20px"><div id="directions_panel" style="margin:20px;background-color:#FFEE77;"></div><div id="total"></div>

I was wondering if anyone knew how to use the google maps api to find the midpoint of a route between two places. I dont want the geographic center but rather the midpoint along the driving distance. I am new to both Javascript and the google maps api so if you could include a demo or some code with your answer it would be very helpful. The end result would output the latitude and longitude and would represent something like what this website has: http://www.geomidpoint.com/meet/.

So far I have only calculated the geographic midpoint between certain points using the algorithm here: Calculate the center point of multiple latitude/longitude coordinate pairs

I wanted to test efficiencies between geographic center and route midpoint for some research

解决方案

Example that calculates the midpoint of a route

Uses the v3 version of Mike Williams' epoly library.

  var directionDisplay;
  var directionsService = new google.maps.DirectionsService();
  var map;
  var polyline = null;
  var infowindow = new google.maps.InfoWindow();

function createMarker(latlng, label, html) {
    var contentString = '<b>'+label+'</b><br>'+html;
    var marker = new google.maps.Marker({
        position: latlng,
        map: map,
        title: label,
        zIndex: Math.round(latlng.lat()*-100000)<<5
        });
        marker.myname = label;

    google.maps.event.addListener(marker, 'click', function() {
        infowindow.setContent(contentString+"<br>"+marker.getPosition().toUrlValue(6)); 
        infowindow.open(map,marker);
        });
    return marker;
}

  function initialize() {
    directionsDisplay = new google.maps.DirectionsRenderer({suppressMarkers:true});
    var chicago = new google.maps.LatLng(41.850033, -87.6500523);
    var myOptions = {
      zoom: 6,
      mapTypeId: google.maps.MapTypeId.ROADMAP,
      center: chicago
    }
    map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    polyline = new google.maps.Polyline({
    path: [],
    strokeColor: '#FF0000',
    strokeWeight: 3
    });
    directionsDisplay.setMap(map);
    calcRoute();
  }
  
  function calcRoute() {
    var start = document.getElementById("start").value;
    var end = document.getElementById("end").value;
    var travelMode = google.maps.DirectionsTravelMode.DRIVING

    var request = {
        origin: start,
        destination: end,
        travelMode: travelMode
    };
    directionsService.route(request, function(response, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        polyline.setPath([]);
        var bounds = new google.maps.LatLngBounds();
        startLocation = new Object();
        endLocation = new Object();
        directionsDisplay.setDirections(response);
        var route = response.routes[0];
        var summaryPanel = document.getElementById("directions_panel");
        summaryPanel.innerHTML = "";

        // For each route, display summary information.
    var path = response.routes[0].overview_path;
    var legs = response.routes[0].legs;
        for (i=0;i<legs.length;i++) {
          if (i == 0) { 
            startLocation.latlng = legs[i].start_location;
            startLocation.address = legs[i].start_address;
            marker = createMarker(legs[i].start_location,"midpoint","","green");
          }
          endLocation.latlng = legs[i].end_location;
          endLocation.address = legs[i].end_address;
          var steps = legs[i].steps;
          for (j=0;j<steps.length;j++) {
            var nextSegment = steps[j].path;
            for (k=0;k<nextSegment.length;k++) {
              polyline.getPath().push(nextSegment[k]);
              bounds.extend(nextSegment[k]);
            }
          }
        }

        polyline.setMap(map);

        computeTotalDistance(response);
      } else {
        alert("directions response "+status);
      }
    });
  }

var totalDist = 0;
var totalTime = 0;
      function computeTotalDistance(result) {
      totalDist = 0;
      totalTime = 0;
      var myroute = result.routes[0];
      for (i = 0; i < myroute.legs.length; i++) {
        totalDist += myroute.legs[i].distance.value;
        totalTime += myroute.legs[i].duration.value;      
      }
      putMarkerOnRoute(50);

      totalDist = totalDist / 1000.
      document.getElementById("total").innerHTML = "total distance is: "+ totalDist + " km<br>total time is: " + (totalTime / 60).toFixed(2) + " minutes";
      }

      function putMarkerOnRoute(percentage) {
        var distance = (percentage/100) * totalDist;
        var time = ((percentage/100) * totalTime/60).toFixed(2);
        if (!marker) {
          marker = createMarker(polyline.GetPointAtDistance(distance),"time: "+time,"marker");
        } else {
          marker.setPosition(polyline.GetPointAtDistance(distance));
          marker.setTitle("time:"+time);
        }
      }

code snippet:

var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var polyline = null;
var infowindow = new google.maps.InfoWindow();

function createMarker(latlng, label, html) {
  var contentString = '<b>' + label + '</b><br>' + html;
  var marker = new google.maps.Marker({
    position: latlng,
    map: map,
    title: label,
    zIndex: Math.round(latlng.lat() * -100000) << 5
  });
  marker.myname = label;

  google.maps.event.addListener(marker, 'click', function() {
    infowindow.setContent(contentString + "<br>" + marker.getPosition().toUrlValue(6));
    infowindow.open(map, marker);
  });
  return marker;
}

function initialize() {
  directionsDisplay = new google.maps.DirectionsRenderer({
    suppressMarkers: true
  });
  var chicago = new google.maps.LatLng(41.850033, -87.6500523);
  var myOptions = {
    zoom: 6,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    center: chicago
  }
  map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
  polyline = new google.maps.Polyline({
    path: [],
    strokeColor: '#FF0000',
    strokeWeight: 3
  });
  directionsDisplay.setMap(map);
  calcRoute();
}

function calcRoute() {
  var start = document.getElementById("start").value;
  var end = document.getElementById("end").value;
  var travelMode = google.maps.DirectionsTravelMode.DRIVING

  var request = {
    origin: start,
    destination: end,
    travelMode: travelMode
  };
  directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      polyline.setPath([]);
      var bounds = new google.maps.LatLngBounds();
      startLocation = new Object();
      endLocation = new Object();
      directionsDisplay.setDirections(response);
      var route = response.routes[0];
      var summaryPanel = document.getElementById("directions_panel");
      summaryPanel.innerHTML = "";

      // For each route, display summary information.
      var path = response.routes[0].overview_path;
      var legs = response.routes[0].legs;
      for (i = 0; i < legs.length; i++) {
        if (i == 0) {
          startLocation.latlng = legs[i].start_location;
          startLocation.address = legs[i].start_address;
          marker = createMarker(legs[i].start_location, "midpoint", "", "green");
        }
        endLocation.latlng = legs[i].end_location;
        endLocation.address = legs[i].end_address;
        var steps = legs[i].steps;
        for (j = 0; j < steps.length; j++) {
          var nextSegment = steps[j].path;
          for (k = 0; k < nextSegment.length; k++) {
            polyline.getPath().push(nextSegment[k]);
            bounds.extend(nextSegment[k]);
          }
        }
      }

      polyline.setMap(map);

      computeTotalDistance(response);
    } else {
      alert("directions response " + status);
    }
  });
}

var totalDist = 0;
var totalTime = 0;

function computeTotalDistance(result) {
  totalDist = 0;
  totalTime = 0;
  var myroute = result.routes[0];
  for (i = 0; i < myroute.legs.length; i++) {
    totalDist += myroute.legs[i].distance.value;
    totalTime += myroute.legs[i].duration.value;
  }
  putMarkerOnRoute(50);

  totalDist = totalDist / 1000.
  document.getElementById("total").innerHTML = "total distance is: " + totalDist + " km<br>total time is: " + (totalTime / 60).toFixed(2) + " minutes";
}

function putMarkerOnRoute(percentage) {
  var distance = (percentage / 100) * totalDist;
  var time = ((percentage / 100) * totalTime / 60).toFixed(2);
  if (!marker) {
    marker = createMarker(polyline.GetPointAtDistance(distance), "time: " + time, "marker");
  } else {
    marker.setPosition(polyline.GetPointAtDistance(distance));
    marker.setTitle("time:" + time);
  }
}
google.maps.event.addDomListener(window, 'load', initialize);

// from http://www.geocodezip.com/scripts/v3_epoly.js, modified to use the geometry library
// === A method which returns a GLatLng of a point a given distance along the path ===
// === Returns null if the path is shorter than the specified distance ===
google.maps.Polyline.prototype.GetPointAtDistance = function(metres) {
  // some awkward special cases
  if (metres == 0) return this.getPath().getAt(0);
  if (metres < 0) return null;
  if (this.getPath().getLength() < 2) return null;
  var dist = 0;
  var olddist = 0;
  for (var i = 1;
    (i < this.getPath().getLength() && dist < metres); i++) {
    olddist = dist;
    dist += google.maps.geometry.spherical.computeDistanceBetween(this.getPath().getAt(i), this.getPath().getAt(i - 1));
  }
  if (dist < metres) {
    return null;
  }
  var p1 = this.getPath().getAt(i - 2);
  var p2 = this.getPath().getAt(i - 1);
  var m = (metres - olddist) / (dist - olddist);
  return new google.maps.LatLng(p1.lat() + (p2.lat() - p1.lat()) * m, p1.lng() + (p2.lng() - p1.lng()) * m);
}

html {
  height: 100%
}

body {
  height: 100%;
  margin: 0px;
  padding: 0px
}

<script type="text/javascript" src="http://maps.google.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=geometry"></script>
<div id="tools">
  start:
  <input type="text" name="start" id="start" value="Hyderabad" /> end:
  <input type="text" name="end" id="end" value="Bangalore" />
  <input type="submit" onclick="calcRoute();" /><br />
</div>
<div id="map_canvas" style="float:left;width:70%;height:80%;"></div>
<div id="control_panel" style="float:right;width:30%;text-align:left;padding-top:20px">
  <div id="directions_panel" style="margin:20px;background-color:#FFEE77;"></div>
  <div id="total"></div>
</div>

这篇关于谷歌地图中路线的中点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！