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发表于 2022-9-25 11:03:30
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显示全部楼层
首先引入leaflet相关js和css
<link rel=&quot;stylesheet&quot; href=&quot;http://cdn.***.com/leaflet-0.7.3/***.css&quot; />
<script src=&quot;http://cdn.***.com/leaflet-0.7.3/***.js&quot;></script>
然后构建地图,并添加openStreetMap
// create a map in the &quot;map&quot; div, set the view to a given place and zoom
var map = L.map(&#39;map&#39;).setView([51.505, -0.09], 13);
// add an OpenStreetMap tile layer
***.ti***e***ayer(&#39;http://{s}.tile.***.org/{z}/{x}/{y}.png&#39;).addTo(map);
// add a marker in the given location, attach some popup content to it and open the popup
***.marker([51.5, -0.09]).addTo(map)
.bindPopup(&#39;A pretty CSS3 popup.
Easily customizable.&#39;)
.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,然后调用超类的构造函数,取消默认的双击和滚轮操作,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 = ***.createelement(&quot;div&quot;);
canvas.***.width = &quot;100%&quot;;
canvas.***.height = &quot;100%&quot;;
***.appendchild(canvas);
***.dosuperConstructor(this, MapGraph, [canvas]);
***.enablewheelzoom = false;
***.enabledoubleclicktooverview = false;
***.originatcenter = false;
***.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,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***.prototype = {
map: null,
mapShowing: true,
enableInertia: false,
createNodeByLonLat: function (name, lon, lat) {
var l = ***.tolonlat(lon, lat);
var p = ***.getpixelfromlonlat(l);
var node = ***.createnode(name, p.x, p.y);
***.lonlat = l;
return node;
},
toLonLat: function (lon, lat) {
return new ***.***at***ng(lat, lon);
},
getPixelFromLonLat: function (lonLat) {
return ***.map.latLngToContainerPoint(lonLat, ***.map._zoom);
},
getLonLatFromPixel: function (x, y) {
return this.***.containerpointtolatlng([x, y]);
},
setMap: function (map) {
***.map = map;
this.***.on(&quot;zoomstart&quot;, ***.hidegraph, this);
this.***.on(&quot;zoomend&quot;, ***.updatenodes, this);
this.***.ondblclick = createEventFunction(this, function (evt) {
if (***.getelementbymouseevent(evt)) {
***.stopevent(evt);
}
});
this.***.addlistener(function (evt) {
if (***.kind == q.***.element_MOVE_END) {
var datas = ***.datas;
***.foreach(datas, function (data) {
var pixel = ***.tocanvas(***.location.x, ***.location.y);
***.lonlat = ***.getlonlatfrompixel(pixel.x, pixel.y);
}, this);
}
}, this)
},
hideGraph: function(){
this.***.visibility = &quot;hidden&quot;;
},
showGraph: function(){
this.***.visibility = &quot;&quot;;
},
translate: function (tx, ty) {
***.dosuper(this, MapGraph, &quot;translate&quot;, arguments);
this.***.panby([-tx, -ty], {animate: false});
},
resetVisibility: function () {
***.foreach(function (e) {
if (***.invalidat***visibility) {
***.invalidat***visibility(true);
}
});
},
updateNodes: function () {
***.translateto(0, 0, 1, true);
***.resetvisibility();
***.foreach(function (d) {
if (d instanceof ***.node) {
var l = ***.lonlat;
var p = ***.getpixelfromlonlat(l);
***.location = p;
}
}, this);
***.showgraph();
}
}
***.extend(MapGraph, ***.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 |
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