GMaps API - 计算路线进入步行区域

Question

到目前为止，我的计算路线运行良好，但我的目的地地址有问题。

当目的地在步行区（市中心）内时，此目的地（lat，long）将设置为下一个有效街道。这可能是它应该如何，但重要的是我得到路线直到特定的目的地地址。我想要的是：例如我开车进入步行区，或者我开车尽量开车然后步行到目的地。

任何人都知道如何解决这个问题？我使用以下代码，代码工作，这不是问题：

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<script type="text/javascript">

var directionsDisplay = new google.maps.DirectionsRenderer({
	animation: google.maps.Animation.DROP,
	draggable: true
});
var directionsService = new google.maps.DirectionsService();
var map;
var geocoder;
var resultsInput;

var question;
var routeStart, routeEnd;
var travMode;
var frage_gruppen_nr;

var zsf1,zsf2;

var zentrieren;

function initialize() {
	geocoder = new google.maps.Geocoder();

	routeStart = $('.multiple-short-txt:eq(0) .text:eq(0)');
     routeEnd = $('.multiple-short-txt:eq(0) .text:eq(1)');
	

	coords_field_map = $('.text-short:eq(1) .text:eq(0)');
	coords_field_map.hide();

	zsf1 = $('.multiple-short-txt:eq(1) .text:eq(0)');
	zsf2 = $('.multiple-short-txt:eq(1) .text:eq(1)');	


	 var aktuelle_frage = 'r1';
	 var frage_gruppen_nr = parseInt(aktuelle_frage.substr(1));
	 frage_gruppen_nr = frage_gruppen_nr - 1;

	 if(frage_gruppen_nr>1){
			
			routeStart.val('xxxx');	

			var coords;
			var ziel_vorfrage =  'abc';	
			alert(ziel_vorfrage);
			geocoder.geocode( { 'address': ziel_vorfrage}, function(results1, status1) {
					if (status1 == google.maps.GeocoderStatus.OK) {
					coords = String(results1[0].geometry.location)

					} 
				});
			zentrieren = new google.maps.LatLng(coords);	 
	 }else{

		zentrieren = new google.maps.LatLng(49.759578, 6.644134);	 
	 }
 
	
	travMode = document.getElementsByTagName("SELECT")[0];
	
	question = '{SGQ}_c';

	var mapOptions = {
		zoom:12,
		center: zentrieren
	};
	
map = new google.maps.Map(document.getElementById('gmap_canvas_'+question), mapOptions);

	google.maps.event.addListener(directionsDisplay, 'directions_changed', function(event) {
		
		var directions = this.getDirections();
		var overview_path = directions.routes[0].overview_path;
		var startingPoint = overview_path[0];
		var destination = overview_path[overview_path.length - 1];

		if (typeof startLatlng === 'undefined' || !startingPoint.equals(startLatlng)) {
			startLatlng = startingPoint;
			getLocationName(startingPoint, function(name) {
			routeStart.val(name);
			});
		}
		if (typeof endLatlng === 'undefined' || !destination.equals(endLatlng)) {
			endLatlng = destination;
			getLocationName(destination, function(name) {
			routeEnd.val(name);
			});
		}
		//alert('startpoint: '+startingPoint);
		calculateDistances(startingPoint, destination);

	});

	directionsDisplay.setMap(map);  
	
	resultsInput = $('.text-long:eq(0) .textarea');

	$(resultsInput).attr('readonly', true);
	
}

function calcRoute() {
	
	var coords;
	var coords2;

	var start =  routeStart.val();	
	 geocoder.geocode( { 'address': start}, function(results1, status1) {
	 if (status1 == google.maps.GeocoderStatus.OK) {
	   coords = String(results1[0].geometry.location)

	} 
	else {
		 alert('Die Startadresse konnte nicht gefunden werden.');
	 }
	 });
	
	
	 var end = routeEnd.val();
	  geocoder.geocode( { 'address': end}, function(results2, status1) {
		 if (status1 == google.maps.GeocoderStatus.OK) {
	 	  coords2 = String(results2[0].geometry.location)
		   
		} 
		else {
		 alert('Die Zieladresse konnte nicht gefunden werden.');
	 	}
	 });	
	 
	var selectedMode;
	
	if(travMode.value == 1){
		selectedMode = 'DRIVING';
	}else if(travMode.value == 2){
		selectedMode = 'BICYCLING';		
	}else if(travMode.value == 3){
		selectedMode = 'TRANSIT';		
	}else if(travMode.value == 4){
		selectedMode = 'WALKING';		
	}

	//
	var request = {
	  origin:start,
	  destination:end,
	  travelMode: google.maps.TravelMode[selectedMode]

	};
	directionsService.route(request, function(response, status) {
    	if (status == google.maps.DirectionsStatus.OK) {
      		directionsDisplay.setDirections(response);
	}
  });
  
}

 
	function calculateDistances(origin, destination) {
		
			var selectedMode;

			//select travel mode
			if(travMode.value == 1){
				selectedMode = 'DRIVING';
			}else if(travMode.value == 2){
				selectedMode = 'BICYCLING';		
			}else if(travMode.value == 3){
				selectedMode = 'TRANSIT';		
			}else if(travMode.value == 4){
				selectedMode = 'WALKING';		
			}

		var service = new google.maps.DistanceMatrixService();
		service.getDistanceMatrix({
			origins: [origin],
			destinations: [destination],
			travelMode: google.maps.TravelMode[selectedMode],
			unitSystem: google.maps.UnitSystem.METRIC,
			avoidHighways: false,
			avoidTolls: false
		}, callback);
	}

	function callback(response, status) {
		
		if (status != google.maps.DistanceMatrixStatus.OK) {
			
		} else {
			
			
			var origins = response.originAddresses;
			var destinations = response.destinationAddresses;

			for (var i = 0; i < origins.length; i++) {
				var results = response.rows[i].elements;
				for (var j = 0; j < results.length; j++) {
					$(resultsInput).val('Startaddresse: '+origins[i]+'\n\nReiseziel: '+destinations[j]+'\n\nDistanz: '+results[j].distance.text+'\n\nZeit: '+results[j].duration.text+'');
					
					//save result to fields
					zsf1.val(results[j].distance.text);
					zsf2.val(results[j].duration.text);
				}
			}
		}
	}

	function getLocationName(latlng, callback) {
		geocoder.geocode({
			location: latlng
		}, function(result, status) {
			if (status === google.maps.GeocoderStatus.OK) {
				var i = -1;
				console.log(result);
				// find the array index of the last object with the locality type
				for (var c = 0; c < result.length; c++) {
					for (var t = 0; t < result[c].types.length; t++) {
						if (result[c].types[t].search('locality') > -1) {
							i = c;
						}
					}
				}

				var locationName = result[0].formatted_address;					
				callback(locationName);
			}
		});
	}
				

google.maps.event.addDomListener(window, 'load', initialize);
</script>

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