leafletjs怎么设置地图

leafletjs怎么设置地图,第1张

首先引入leaflet相关js和css

<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />

<script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>

然后构建地图,并添加openStreetMap

// create a map in the "map" div, set the view to a given place and zoom

var map = L.map('map').setView([51.505, -0.09], 13)

// add an OpenStreetMap tile layer

L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png').addTo(map)

// add a marker in the given location, attach some popup content to it and open the popup

L.marker([51.5, -0.09]).addTo(map)

.bindPopup('A pretty CSS3 popup.

Easily customizable.')

.openPopup()

运行效果如下:

结合Qunee拓扑图

Leaflet地图上可以添加点线面基段汪本图形,如果需要展示更复杂的图形或者链接关系,显得力不足,可以结合Qunee组件使用,下面我们让地图和拓扑图叠加起来,在地图上显示拓扑元素,并整合两者的交互

图层叠加

在地图的DIV容器中添加一个孩子div,作为拓扑图的画布,并设置相应的css,然后野尘调用超类的构造函数,取消默认的双击和滚轮 *** 作,已被后面地图与拓扑图的交互同步var MapGraph = function (map) {

var container = map._container

var canvas = document.createElement("div")

canvas.style.width = "100%"

canvas.style.height = "100%"

container.appendChild(canvas)

Q.doSuperConstructor(this, MapGraph, [canvas])

this.enableWheelZoom = false

this.enableDoubleClickToOverview = false

this.originAtCenter = false

this.setMap(map)

...

}

关联地图

下面实现拓扑图与地图的绑定,在#setMap(map)函数中颂燃禅,监听了地图的zoomstart和zoomend事件,根据经纬度动态的调整图元的屏幕位置,同样在节点被拖动后,也需要设置新的经纬度MapGraph.prototype = {

map: null,

mapShowing: true,

enableInertia: false,

createNodeByLonLat: function (name, lon, lat) {

var l = this.toLonLat(lon, lat)

var p = this.getPixelFromLonLat(l)

var node = graph.createNode(name, p.x, p.y)

node.lonLat = l

return node

},

toLonLat: function (lon, lat) {

return new L.latLng(lat, lon)

},

getPixelFromLonLat: function (lonLat) {

return this.map.latLngToContainerPoint(lonLat, this.map._zoom)

},

getLonLatFromPixel: function (x, y) {

return this.map.containerPointToLatLng([x, y])

},

setMap: function (map) {

this.map = map

this.map.on("zoomstart", this.hideGraph, this)

this.map.on("zoomend", this.updateNodes, this)

this.html.ondblclick = createEventFunction(this, function (evt) {

if (this.getElementByMouseEvent(evt)) {

Q.stopEvent(evt)

}

})

this.interactionDispatcher.addListener(function (evt) {

if (evt.kind == Q.InteractionEvent.ELEMENT_MOVE_END) {

var datas = evt.datas

Q.forEach(datas, function (data) {

var pixel = this.toCanvas(data.location.x, data.location.y)

data.lonLat = this.getLonLatFromPixel(pixel.x, pixel.y)

}, this)

}

}, this)

},

hideGraph: function(){

this.html.style.visibility = "hidden"

},

showGraph: function(){

this.html.style.visibility = ""

},

translate: function (tx, ty) {

Q.doSuper(this, MapGraph, "translate", arguments)

this.map.panBy([-tx, -ty], {animate: false})

},

resetVisibility: function () {

this.forEach(function (e) {

if (e.invalidateVisibility) {

e.invalidateVisibility(true)

}

})

},

updateNodes: function () {

this.translateTo(0, 0, 1, true)

this.resetVisibility()

this.forEach(function (d) {

if (d instanceof Q.Node) {

var l = d.lonLat

var p = this.getPixelFromLonLat(l)

d.location = p

}

}, this)

this.showGraph()

}

}

Q.extend(MapGraph, Q.Graph)

此外还可以通过可见过滤器实现,不同比例尺显示不同的节点

地图之家总目录(建议先查看念姿该内容)

1.(leaflet篇)leaflet接入天地图

2.(leaflet篇)leaflet接入百度地图

3.(leaflet篇)leaflet接入高德、openstreetmap、google地图

4.(leaflet篇)leaflet接入腾讯矢量、腾讯影像地图

5.(leaflet篇)leaflet点采集与点编辑

6.(leaflet篇)leaflet线采集与线编辑

7.(leaflet篇)leaflet面采集与面编辑

8.(leaflet篇)leaflet圆采集与圆编辑

9.(leaflet篇)leaflet矩形采集与矩形编辑

10.(leaflet篇)leaflet暗色系地图样式地图(滤镜实现,反色滤镜)

11.(leaflet篇)leaflet聚合

12.(leaflet篇)leaflet叠加热力图激拍

13.(leaflet篇)leaflet散点图

14.(leaflet篇)leaflet波纹点

15.(leaflet篇)leaflet蜂巢图

16.(leaflet篇)leaflet动态热力图

17.(leaflet篇)leaflet动态热力图(大数据版)

18.(leaflet篇)leaflet自定义地图样式地图(插件实现)

19.(leaflet篇)leaflet聚合图(大数据版)

20.(leaflet篇)leaflet图标闪烁

21.(明高羡leaflet篇)leaflet监听地图(移动一段距离后发起请求)

22.(leaflet篇)leaflet区域聚合点(点击后散开并进行合理定位)

23.(leaflet篇)leaflet叠加html(leaflet叠加div元素)

24.(leaflet篇)leaflet接入天地图(经纬度投影256)

25.(leaflet篇)leaflet删除所有图层(不含地图)

26.(leaflet篇)leaflet聚合图(自定义样式版)

下载源码或者针对问题对源码进行修改,或者引用新的js文件和css文件。

由于图层不弯芦是leaflet原生类,可以修改的参数也比较有限,但是在实际应用中,会根据实际会对聚合图层有一些自己的要求,但是却无法修改。

通过在leaflet.markercluster-src.js搜索“large”,可以搜索到进行分段的相关代码。可见默认只对点数量聚合了三类,并备闹毁且范围写死,100以上全部为红,导致数据量大展示效果十分不好。找到相应的代码就是仿备可以改了,改起来也十分简单,如果要修改数量范围直接修改数字即可,如果要新加颜色样式可以添加else if (childCount 回答于 2022-04-20


欢迎分享,转载请注明来源:内存溢出

原文地址: http://outofmemory.cn/bake/11972769.html

(0)
打赏 微信扫一扫 微信扫一扫 支付宝扫一扫 支付宝扫一扫
上一篇 2023-05-20
下一篇 2023-05-20

发表评论

登录后才能评论

评论列表(0条)

保存