给定以下关于 Plunker 的 Leaflet.Draw 示例，我将如何捕获矩形创建的事件和对它的操作？

Question

Plunker 示例： Leaflet Draw plugin with OSM map

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('leaflet', { 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);
});

我需要捕获一个创建的矩形并最终用它的坐标创建一个文件，但现在我正在尝试弄清楚如何捕获事件并将矩形坐标输出到控制台。

原谅我，还在踏入Javascript。谢谢

--编辑-- 所以我看到了如何将此事件记录到控制台，但我不清楚如何从事件中访问 lat/lng 信息。

map.on('draw:rectangle-created', function (e) {
    console.log(e.rectangle-created);
});

Answer 1

只需使用 draw:created 事件并检查类型是否为矩形：

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

    if (type === 'rectangle') {
        // It's a rectangle, do stuff
        console.log(layer.getLatLngs());
    }

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

您可以通过调用 getLatLngs 方法来访问矩形的坐标。它 returns 一个包含 L.LatLng 个对象的数组：

rectangle.getLatLngs().forEach(function (latlng) {
    console.log(latlng.lat); //latitude
    console.log(latlng.lng); //longitude
});

http://leafletjs.com/reference.html#latlng

给定以下关于 Plunker 的 Leaflet.Draw 示例，我将如何捕获矩形创建的事件和对它的操作？

Given the following Leaflet.Draw example on Plunker, how would I catch the rectangle created event and action on it?

javascript

leaflet

leaflet.draw