单张绘图，仅标记显示，线条和多边形不可见

Question

我正在尝试添加Leaflet Draw library /控件。

我可以添加一个标记，它会持续存在（并保持可见）。但是当我添加一条线或多边形时，它们是不可见的（如果我检查.layers则保持不变，也检查屏幕截图。元素似乎在那里，但它只是不可见）。

任何指导都将受到高度赞赏！

编辑：我正在使用以下代码初始化地图：

var elem = angular.element('#datasetLeafletMap'); //using Angular
console.log('initting map', elem[0]);


var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                osmAttrib = '&copy; <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
osm = L.tileLayer(osmUrl, { maxZoom: 18, attribution: osmAttrib });
var map = new L.Map(elem[0], { layers: [osm], center: new L.LatLng(52.105289405897, 5.2629891004852425), zoom: 13 });
console.log('map ready');

var drawnItems = new L.FeatureGroup();

var coords = [new L.latLng(51.2, 4.5), new L.latLng(51.2, 4.6), new L.latLng(51.2, 4.9)];
var poly = new L.Polyline(coords, {
color: 'blue',
opacity: 1,
weight: 5
});

drawnItems.addLayer(poly);


map.addLayer(drawnItems);


var drawControl = new L.Control.Draw({
    draw: {
        position: 'right',
        polygon: {
            title: 'Polygon',
            allowIntersection: false,
            drawError: {
                color: '#b00b00',
                timeout: 1000
            },
            shapeOptions: {
                color: '#bada55'
            },
            showArea: true
        },
        polyline: {
            metric: false
        },
        circle: {
            shapeOptions: {
                color: '#662d91'
            }
        }
    },
    edit: {
        featureGroup: drawnItems
    }
});

map.addControl(drawControl);

map.on('draw:created', function (e) {
    var type = e.layerType,
        layer = e.layer;

    if (type === 'marker') {
        layer.bindPopup('A popup!');
    }

    drawnItems.addLayer(layer);
    console.log('adding layer', layer, drawnItems);
});