点击在谷歌地图上绘制路线

Question

当用户单击两个标记时，我需要在谷歌地图标记上绘制路线，这些路线出现在用户单击的标记之间。 在图像中，当用户单击两个标记路线时，您可以看到我需要的多个地图标记出现在两个地图标记之间。

    var map;
  function initMap() {



    var origin_place_id = null;
    var destination_place_id = null;
    var myCenter=new google.maps.LatLngBounds();

    var travel_mode = google.maps.TravelMode.WALKING;
    map = new google.maps.Map(document.getElementById('map'), {
      mapTypeControl: false,
      center: myCenter,
      zoom: 7,
      mapTypeId:google.maps.MapTypeId.ROADMAP
    });

    var markers = [
        ['Faisalabad, Pakistan', 31.4187,73.0791],
        ['Multan, Pakistan', 30.1984,71.4687],
        ['Lahore, Pakistan', 31.5546,74.3572],
        ['Sahiwal, Pakistan', 30.6612,73.1086]
    ];

    var infoWindow = new google.maps.InfoWindow(), marker, i;

    for( i = 0; i < markers.length; i++ ) {
    var position = new google.maps.LatLng(markers[i][1], markers[i][2]);
    myCenter.extend(position);
    marker = new google.maps.Marker({
        position: position,
        map: map,
        title: markers[i][0]
    });
        map.fitBounds(myCenter);
    }
    var boundsListener = google.maps.event.addListener((map), 'bounds_changed', function(event) {
        this.setZoom(8);
        google.maps.event.removeListener(boundsListener);
    });

    google.maps.event.addDomListener(document.getElementById('go'), 'click',route);
    var directionsService = new google.maps.DirectionsService;
    var directionsDisplay = new google.maps.DirectionsRenderer;

    directionsDisplay.setMap(map);

    var origin_input = document.getElementById('origin-input');
    var destination_input = document.getElementById('destination-input');
    var modes = document.getElementById('mode-selector');



    map.controls[google.maps.ControlPosition.TOP_LEFT].push(modes);

    var origin_autocomplete = new google.maps.places.Autocomplete(origin_input);
    origin_autocomplete.bindTo('bounds', map);
    var destination_autocomplete = new google.maps.places.Autocomplete(destination_input);
    destination_autocomplete.bindTo('bounds', map);


    function setupClickListener(id, mode) {
      var radioButton = document.getElementById(id);
      radioButton.addEventListener('click', function() {
        travel_mode = mode;
      });
    }
    setupClickListener('changemode-walking', google.maps.TravelMode.WALKING);
    setupClickListener('changemode-transit', google.maps.TravelMode.TRANSIT);
    setupClickListener('changemode-driving', google.maps.TravelMode.DRIVING);


    function expandViewportToFitPlace(map, place) {
        if (place.geometry.viewport) {
        map.fitBounds(place.geometry.viewport);
      } else {
        map.setCenter(place.geometry.location);
        map.setZoom(17);
      }
    }

    origin_autocomplete.addListener('place_changed', function() {
      var place = origin_autocomplete.getPlace();
      if (!place.geometry) {
        window.alert("Autocomplete's returned place contains no geometry");
        return;
      }
      expandViewportToFitPlace(map, place);


      origin_place_id = place.place_id;
      route(origin_place_id, destination_place_id, travel_mode,
            directionsService, directionsDisplay);
    });

    destination_autocomplete.addListener('place_changed', function() {
      var place = destination_autocomplete.getPlace();
      if (!place.geometry) {
        window.alert("Autocomplete's returned place contains no geometry");
        return;
      }

      expandViewportToFitPlace(map, place);
    $('#go').click(function(){
        var origin_input = document.getElementById('origin-input').value;
        var res = origin_input.split(",");
        var bc = res[0];
        var destination_input = document.getElementById('destination-input').value;
        var res = destination_input.split(",");
        var bd = res[0];

        destination_place_id = place.place_id;
        route(origin_place_id, destination_place_id, travel_mode,
            directionsService, directionsDisplay);
        });
    });
    $('#mode-selector').hide();
    $('#go').click(function(){
        //$('#go').hide(250);
        $('#mode-selector').show(250);
    });


    function route(origin_place_id, destination_place_id, travel_mode,
    directionsService, directionsDisplay) {
      if (!origin_place_id || !destination_place_id) {
        return;
      }
      directionsService.route({
        origin: {'placeId': origin_place_id},
        destination: {'placeId': destination_place_id},
        travelMode: travel_mode
      }, 
    function(response, status) {
        if (status === google.maps.DirectionsStatus.OK) {
          directionsDisplay.setDirections(response);
        } else {
          window.alert('Directions request failed due to ' + status);
        }
      });
    }
  }

Answer 1

<!DOCTYPE html>
<html>
  <head>
    <title>Simple click event</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      // JavaScript Document
var map;
  function initMap() 
  {
  	 var myCenter=new google.maps.LatLngBounds();
	 var directionsDisplay;
     var directionsService = new google.maps.DirectionsService();
	
   	 map = new google.maps.Map(document.getElementById('map'), {
      	mapTypeControl: false,
      	center: myCenter,
      	zoom: 7,
      	mapTypeId:google.maps.MapTypeId.ROADMAP
    	});

		var markers = [
			['Faisalabad, Pakistan', 31.4187,73.0791],
			['Multan, Pakistan', 30.1984,71.4687],
			['Lahore, Pakistan', 31.5546,74.3572],
			['Sahiwal, Pakistan', 30.6612,73.1086]
		];
		 directionsDisplay = new google.maps.DirectionsRenderer();
		
		directionsDisplay.setMap(map);

	    var infoWindow = new google.maps.InfoWindow(), marker, i;

    	for( i = 0; i < markers.length; i++ ) {
			//var myLatLng = {lat: markers[i][1], lng: markers[i][2]};
    	var pos = new google.maps.LatLng(markers[i][1], markers[i][2]);
    	myCenter.extend(pos);
    	marker = new google.maps.Marker({
        position: pos,
        map: map,
        title: markers[i][0]
    	});
        map.fitBounds(myCenter);
		
		var  route = 0;
		var pos_source=0;
		var pos_destination=0;
		
		google.maps.event.addListener(marker, 'click', (function(marker, i) {
            return function() {
				route++;
				if(route==1)
				{
					pos_source = this.position;
				}
				if(route==2)
				{
					pos_destination = this.position;
					route = 0;
					
					var start = new google.maps.LatLng(pos_source.lat(), pos_source.lng());
					var end = new google.maps.LatLng(pos_destination.lat(), pos_destination.lng());
					var request = {
						origin: start,
						destination: end,
						travelMode: google.maps.TravelMode.DRIVING
					};
					directionsService.route(request, function (response, status) {
						if (status == google.maps.DirectionsStatus.OK) {
							directionsDisplay.setDirections(response);
						}
					});
				}
                
				}
        })(marker, i));
    	}
  }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?callback=initMap">
    </script>
  </body>
</html>

Answer 2

您所要做的就是跟踪用户单击的两个标记。为此，创建一个全局标记数组。在每个标记上单击检查标记数组是否为：

• 空：推送当前标记（刚刚被点击）
• 包含一个元素：调用 showRoute 函数并将当前标记（目标）和数组（源）中存在的标记作为参数传递。使用 google map direction api 绘制路线。清空标记数组。