标签：center nts dynamic weight return length nbsp http enables
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;font-family:"微软雅黑";}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=ZwQAeZO1fncN63zUmuYeGU7CLU0mpfdk">
</script>
<title>轨迹动态展示</title>
</head>
<body>
<div id="allmap"></div>
</body>
</html>
<script type="text/javascript">
//数据准备,
var points = [];//原始点信息数组
var bPoints = [];//百度化坐标数组。用于更新显示范围。
//创建标注点并添加到地图中
function addMarker(points) {
//循环建立标注点
for(var i=0, pointsLen = points.length; i<pointsLen; i++) {
var point = new BMap.Point(points[i].lng, points[i].lat); //将标注点转化成地图上的点
var marker = new BMap.Marker(point); //将点转化成标注点
map.addOverlay(marker); //将标注点添加到地图上
//添加监听事件
(function() {
var thePoint = points[i];
marker.addEventListener("click",
function() {
showInfo(this,thePoint);
});
})();
}
}
//添加线
function addLine(points){
var linePoints = [],pointsLen = points.length,i,polyline;
if(pointsLen == 0){
return;
}
// 创建标注对象并添加到地图
for(i = 0;i <pointsLen;i++){
linePoints.push(new BMap.Point(points[i].lng,points[i].lat));
}
polyline = new BMap.Polyline(linePoints, {strokeColor:"blue", strokeWeight:5, strokeOpacity:1}); //创建折线
map.addOverlay(polyline); //增加折线
}
//随机生成新的点，加入到轨迹中。
function dynamicLine(){
var lng = 112+getRandom(100)*0.01;
var lat = 26+getRandom(100)*0.01;
var id = getRandom(1000);
var point = {"lng":lng,"lat":lat,"status":1,"id":id}
var makerPoints = [];
var newLinePoints = [];
var len;
makerPoints.push(point);
addMarker(makerPoints);//增加对应该的轨迹点
points.push(point);
bPoints.push(new BMap.Point(lng,lat));
len = points.length;
newLinePoints = points.slice(len-2, len);//最后两个点用来画线。
addLine(newLinePoints);//增加轨迹线
setZoom(bPoints);
setTimeout(dynamicLine, 1000);
}
// 获取随机数
function getRandom(n){
return Math.floor(Math.random()*n+1)
}
//根据点信息实时更新地图显示范围，让轨迹完整显示。设置新的中心点和显示级别
function setZoom(bPoints){
var view = map.getViewport(eval(bPoints));
var mapZoom = view.zoom;
var centerPoint = view.center;
map.centerAndZoom(centerPoint,mapZoom);
}
//创建地图
var map = new BMap.Map("allmap");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 11); // 设置中心点
map.centerAndZoom( "衡阳");
map.setCurrentCity("衡阳"); //设置为衡阳
map.addControl(new BMap.MapTypeControl()); //可拖拽
map.enableScrollWheelZoom(true); //滚轮实现方法缩小
dynamicLine();
</script>
标签：center nts dynamic weight return length nbsp http enables
原文地址：http://www.cnblogs.com/ordinaryk/p/6828069.html
