angular-google-maps中心缩放多个标记

Question

我正在使用AngularJS for Google Maps，并希望根据动态加载的多个标记来动态居中和缩放地图。这是一个使用Ionic Framework的Cordova应用程序。

这是我的观点：

<ion-view title="" ng-controller="MapCtrl as vm">
 <ion-content class="padding">
  <google-map id="mainMap" control="vm.googleMap" draggable="true" center="vm.map.center" zoom="vm.map.zoom" mark-click="false">
      <markers idKey="mainMap" fit="vm.map.fit">
          <marker idKey="marker.id" ng-repeat="marker in vm.map.markers" coords="marker.coords" options="marker.options">
              <marker-label content="marker.name" anchor="2 0" class="marker-labels"/>
          </marker>
      </markers>
  </google-map>
 </ion-content>
</ion-view>

这是我的控制器：

angular.module('myApp.controllers', [])

.controller('MapCtrl', function($scope, $ionicPlatform) {
 var vm = this;
 vm.googleMap = {}; // this is filled when google map is initialized, but it's too late
 vm.mapMarkers = [];

 vm.arrMarkers = [
    {
        id: "home",
        name: "home",
        coords: {
            latitude:xxxxxxx, //valid coords
            longitude:xxxxxxx //valid coords
        },
        options: {
            animation: google.maps.Animation.BOUNCE
        }
    },
    {
        id: "placeAId",
        name: "Place A",
        coords: {
            latitude:xxxxxxx, //valid coords
            longitude:xxxxxxx //valid coords
        }
    },
    {
        id: "placeBId",
        name: "Place B",
        coords: {
            latitude:xxxxxxx, //valid coords
            longitude:xxxxxxx //valid coords
        }
    }
];
vm.map = {
    center: { //how to determine where to center???
        latitude: xxxxxxx, //valid coords
        longitude: xxxxxxx //valid coords
    },
    zoom: 12, //how to determine zoom dynamically???
    fit: true,
    markers: vm.arrMarkers
};

var setMapBounds = function () {
    var bounds = new google.maps.LatLngBounds();
    createMarkers();
    var markers = vm.mapMarkers;
    for(var i=0; i<markers.length; i++) {
        bounds.extend(markers[i].getPosition());
    }
    var map = vm.googleMap.control.getGMap();
    map.setCenter(bounds.getCenter());
    map.fitBounds(bounds);
    //remove one zoom level to ensure no marker is on the edge.
    map.setZoom(map.getZoom()-1);

    // set a minimum zoom
    // if you got only 1 marker or all markers are on the same address map will be zoomed too much.
    if(map.getZoom()> 15){
        map.setZoom(15);
    }
};

var createMarkers = function() {
    var map = vm.googleMap.control.getGMap(); //vm.googleMap.control is undefined because this fire before map is initialized
    angular.forEach(vm.restaurants, function(restaurant, index) {
        var marker = new google.maps.Marker({
            map: map,
            position: new google.maps.LatLng(restaurant.coords.latitude, restaurant.coords.longitude),
            title: restaurant.name
        });
        vm.mapMarkers.push(marker);
    });
};

$ionicPlatform.ready(function() {
    setMapBounds();
});

})

因此，我的问题是如何使用多个动态加载的标记对地图进行居中和缩放？另外，如何在加载地图之前获取googleMap.control (vm.googleMap.control)的实例？

Answer 1

这是我的代码，以防有人想知道如何在本地执行此操作。这是一个简单的解决方案，满足了我的需求，我确实回到了angualr-google地图，但到目前为止，它在我的应用程序中工作得很好。

angular.module('myApp.controllers', [])
.controller('MapCtrl', function($scope) {
    var vm = this;
    vm.googleMap = null; 
    vm.mapMarkers = [];

    var onSuccess = function(position) {
        vm.userLocation.coords.latitude = position.coords.latitude;
        vm.userLocation.coords.longitude = position.coords.longitude;

        initializeMap();
    };

    var onError = function(error) {
        alert('code: ' + error.code + '\n' + 'message: ' + error.message);
    };

    vm.userLocation = {
        id: "home",
        title: "home",
        coords: {
            latitude: 33.636727,
            longitude: -83.920702
        },
        options: {
            animation: google.maps.Animation.BOUNCE
        }
    };

    vm.places = [
        {
            id: "78869C43-C694-40A5-97A0-5E709AA6CE51",
            title: "Place A",
            coords: {
                latitude: 33.625296,
                longitude: -83.976206
            }
        },
        {
            id: "52319278-83AA-46D4-ABA6-307EAF820E77",
            title: "Place B",
            coords: {
                latitude: 33.576522,
                longitude: -83.964981
            }
        }
    ];

    var addMarkers = function() {
        var userLocation = new google.maps.Marker({
            map: vm.googleMap,
            position: new google.maps.LatLng(vm.userLocation.coords.latitude, vm.userLocation.coords.longitude),
            //animation: vm.userLocation.options.animation,
            title: vm.userLocation.title
        });

        vm.mapMarkers.push(userLocation);

        angular.forEach(vm.places, function(location, index) {
            var marker = new google.maps.Marker({
                map: vm.googleMap,
                position: new google.maps.LatLng(location.coords.latitude, location.coords.longitude),
                title: location.title
            });
            vm.mapMarkers.push(marker);
        });

        var bounds = new google.maps.LatLngBounds();

        for (var i = 0; i < vm.mapMarkers.length; i++) {
            bounds.extend(vm.mapMarkers[i].getPosition());
        }
        vm.googleMap.setCenter(bounds.getCenter());
        vm.googleMap.fitBounds(bounds);
        //remove one zoom level to ensure no marker is on the edge.
        vm.googleMap.setZoom(vm.googleMap.getZoom() - 1);

        // set a minimum zoom
        // if you got only 1 marker or all markers are on the same address map will be zoomed too much.
        if (vm.googleMap.getZoom() > 15) {
            vm.googleMap.setZoom(15);
        }
    };

    var initializeMap = function() {
        var mapOptions = {
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            zoom: 12,
            center: new google.maps.LatLng(vm.userLocation.coords.latitude, vm.userLocation.coords.longitude)
        };
        var div = document.getElementById("map_canvas");
        //var map = plugin.google.maps.Map.getMap(div, mapOptions);
        vm.googleMap = new google.maps.Map(div, mapOptions);
        addMarkers();

        var width = screen.width;
        var height = screen.height;
    };

    navigator.geolocation.getCurrentPosition(onSuccess, onError);

})

Answer 2

你之前的回答很好，但没有包括你在文章开头提到的google地图指令的用法。有一种方法可以使用这些指令来实现，如下所示：

假设我们在指令的作用域中

1. Define scope.mapControl = {}; -在为指令定义标记时，这将为地图和标记提供新的访问方法
2. -包括要添加的此控件属性：

{{location.description}}在指令的事件或某个方法中使用

• ：

变量映射= scope.mapControl.getGMap()；变量标记= scope.mapControl.getGMarkers()；变量界限= map.getBounds()；for (var i= 0；i< markers.length；i++) { bounds.extend(markersi.getPosition())；} map.setCenter(bounds.getCenter())；map.fitBounds(边界)；map.setZoom(map.getZoom() - 1);