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ECharts
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数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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}
百度地图API实现多区域标记 - 爱码网
最近遇到一个业务就是需要需要在地图上标记多个区域。一般餐饮业做外卖的,配送范围一般是多区域的,那么在地图上标记配送范围的时候就需要能标记多个区域。长话短说,最初的实现原型的截图如下:

实现思路如下:
1.根据百度地图API 手册先初始化地图:http://developer.baidu.com/map/reference/index.php?title=Class:%E6%80%BB%E7%B1%BB/%E6%A0%B8%E5%BF%83%E7%B1%BB
2.动态添加标记小区域(此处是给地图绑定鼠标右键事件,当点击鼠标右键时就会动态创建一个矩形区域) ,期原理就是当鼠标在地图上右键点击的时候,就会得到该点在地图上的经纬度坐标,然后以这个经纬度坐标为中心绘制出矩形区域。
3.在添加矩形区域的时候需要判断,右键的这个经纬度坐标是否在已经标记的矩形区域内,如果在则给出提示,当然对于添加的个数你可以自己控制。在这里有一个关键的函数就是判断某个点知否在一个特定的区域。这个代码如下:
/**
*
* 判断某个点是否在一个特定的区域内
* @params pt 经纬度坐标
* @params poly 区域的顶点坐标点
* @return bool true | false
*/
function isInsidePolygon(pt, poly){
for (var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i)
((poly[i].lat <= pt.lat && pt.lat < poly[j].lat) || (poly[j].lat <= pt.lat && pt.lat < poly[i].lat)) &&
(pt.lng < (poly[j].lng - poly[i].lng) * (pt.lat - poly[i].lat) / (poly[j].lat - poly[i].lat) + poly[i].lng) &&
(c = !c);
return c;
}
完整代码如下(HTML 代码):
<html>
<META http-equiv="Content-Type" content="text/html; charset=utf-8">
<head>
<title>百度地图画多边形</title>
</head>
<body>
<style type="text/css">
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?key=&v=1.3"></script>
</head>
<body onLoad="initialize()">
<div id="map_canvas" style="width: 700px; height: 500px;"></div>
</body>
</html>
完整代码如下(JS 代码):
<script type="text/javascript">
/**
*date 20140815
*author cherry.chen
*desc demo for baidu api mutiple marker
**/
var map; // map 对象
var index = 1;
var color = [\'#000000\',\'#A200FF\',\'#0000FF\',\'#008200\',\'#2e4987\']; //多区域标记色块
var polygon = [];
function initialize() {
// 百度地图API功能
map = new BMap.Map("map_canvas");
map.addControl(new BMap.NavigationControl()); // 添加平移缩放控件
map.addControl(new BMap.ScaleControl()); // 添加比例尺控件
map.addControl(new BMap.OverviewMapControl()); //添加缩略地图控件
map.enableScrollWheelZoom(); //启用滚轮放大缩小
map.addControl(new BMap.MapTypeControl());
//添加地图类型控件
//map.setMapType(BMAP_SATELLITE_MAP);
var point = new BMap.Point(108.896, 34.330); // 创建点坐标
map.centerAndZoom(point,15); // 初始化地图,设置中心点坐标和地图级别。
var obj = new Object();
obj.lat = point.lat;
obj.lng = point.lng;
obj.number = 0;
obj.map = map;
initDymamicArea(obj); //初始化地图
//绑定右键事件
map.addEventListener("rightclick", function(e){
if(index > 3){
alert("最多添加4个区域");
return;
}
var pt = new BMap.Point(e.point.lng, e.point.lat);
var res = false;
if(polygon.length > 0){
for(var i=0;i<polygon.length;i++){
console.log(polygon[i].getBounds());
res = isInsidePolygon(pt, polygon[i].getPath());
if(res) break;
}
}
if(res){
alert("区域重叠");
return;
}
var obj = new Object();
obj.lat = e.point.lat;
obj.lng = e.point.lng
obj.number = index;
obj.map = map;
initDymamicArea(obj);
index++;
});
}
/**
*
* 判断某个点是否在一个特定的区域内
* @params pt 经纬度坐标
* @params poly 区域的顶点坐标点
* @return bool true | false
*/
function isInsidePolygon(pt, poly){
for (var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i)
((poly[i].lat <= pt.lat && pt.lat < poly[j].lat) || (poly[j].lat <= pt.lat && pt.lat < poly[i].lat)) &&
(pt.lng < (poly[j].lng - poly[i].lng) * (pt.lat - poly[i].lat) / (poly[j].lat - poly[i].lat) + poly[i].lng) &&
(c = !c);
return c;
}
function initDymamicArea(obj){
var lat = obj.lat;
var lng = obj.lng;
var x1 = lat + 0.002;
var x2 = lat - 0.002;
var y1 = lng + 0.002;
var y2 = lng - 0.002;
var secRing = [];
secRing.push(new BMap.Point(y1,x1));
secRing.push(new BMap.Point(y1,x2));
secRing.push(new BMap.Point(y2,x2));
secRing.push(new BMap.Point(y2,x1));
polygon[obj.number] = new BMap.Polygon(
secRing,
{
strokeColor:color[obj.number],
fillColor:"#AAAAAA",
strokeWeight:3,
strokeOpacity:0,
fillOpacity:0
}
);
polygon[obj.number].enableEditing();
obj.map.addOverlay(polygon[obj.number]);
}
</script>
对于标记多区域的触发事件你可以自己修改,这里只是一个前端的demo,如果你需要保存这些巨型区域的顶点信息,可以通过polygon.getPath() 这个函数得到,你可以选择在点击按钮时得到,或者是给 polygon 添加鼠标离开事件(mouseout),在鼠标离开时得到这个区域的顶点信息。
demo 到这里就完了。
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