Google舆图API使用demo _Web前端

Google地图API使用demo

<html xmlns="http://www.w3.org/1999/xhtml">  
<head><title>API3_DrawCircle</title>  
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<link rel="stylesheet" type="text/css" href="http://www.google.com/uds/css/gsearch.css"/>
<link rel="stylesheet" type="text/css" href="http://www.google.com/uds/solutions/localsearch/gmlocalsearch.css"/>
<script src="https://maps-api-ssl.google.com/maps/api/js?v=3&sensor=true" type="text/javascript"></script> 
<script type="text/javascript" language="JavaScript">  
var map = null;  
var cicles=new Array();//所有圆集合
function displayMap(){
	var myOptions = {
		zoom: 12,  
		center: new google.maps.LatLng(22.54077580925294,114.04699606323243),  
		mapTypeId: google.maps.MapTypeId.ROADMAP  
	};   
	map = new google.maps.Map(document.getElementById("map"),myOptions); 
	google.maps.event.addListener(map, 'click', function(event) {
		if (event) {
			createCircle(new google.maps.LatLng(event.latLng.lat(),event.latLng.lng()),500,800,map);  
		}
	});  

	google.maps.event.addListener(map, 'rightclick', function(event) {
		if (event) {
			cicles.pop().remove();
		}
	});
}


var metric = false;  
var singleClick = false;  
var infowindow = new google.maps.InfoWindow({
	content: ""  
}); 

function createCircle(point, radius1,radius2,map) {
  singleClick = false;  
  var geoQuery = new GeoQuery();  
  geoQuery.initializeCircle(radius1,radius2,point, map);   
  geoQuery.render(); //圆的渲染 
  cicles.push(geoQuery);
}
  
/** 
 * 
 * 算法:通过原点、角度和距离计算目标点的坐标 
 * orig:原点坐标 
 * hdng:角度 
 * dist:原点的到目标点的距离 
 * @return 目标点坐标 
 *  
 */  
function destination(orig, hdng, dist){
  var R = 6371; // earth's mean radius in km  
  var oX, oY;  
  var x, y;  
  var d = dist/R;  // d = angular distance covered on earth's surface  
  hdng = hdng * Math.PI / 180; // degrees to radians  
  oX = orig.lng() * Math.PI / 180;  
  oY = orig.lat() * Math.PI / 180;  
  
  y = Math.asin( Math.sin(oY)*Math.cos(d) + Math.cos(oY)*Math.sin(d)*Math.cos(hdng) );  
  x = oX + Math.atan2(Math.sin(hdng)*Math.sin(d)*Math.cos(oY), Math.cos(d)-Math.sin(oY)*Math.sin(y));  
  
  y = y * 180 / Math.PI;  
  x = x * 180 / Math.PI;  
  return new google.maps.LatLng(y, x);
}
  
/** 
 * 
 * 算法:计算两个坐标点的距离 
 * point1:坐标点1 
 * point2:坐标点2 
 * @return 两点的距离  
 * 
 */  
function distance(point1, point2){
  var R = 6371; // earth's mean radius in km  
  var lon1 = point1.lng()* Math.PI / 180;  
  var lat1 = point1.lat() * Math.PI / 180;  
  var lon2 = point2.lng() * Math.PI / 180;  
  var lat2 = point2.lat() * Math.PI / 180;  
  
  var deltaLat = lat1 - lat2  
  var deltaLon = lon1 - lon2  
  
  var step1 = Math.pow(Math.sin(deltaLat/2), 2) + Math.cos(lat2) * Math.cos(lat1) * Math.pow(Math.sin(deltaLon/2), 2);  
  var step2 = 2 * Math.atan2(Math.sqrt(step1), Math.sqrt(1 - step1));  
  return step2 * R;  
}
  
/** 
 * 画圆的类 
 * 
 */  
function GeoQuery() {}
  
  
  
function MyMap(map,cricle,polylines,markers) {
	this.prototype._map=map;
	this.prototype._circle=circle;
	this.polylines=polylines;
	this.markers=markers;
}


GeoQuery.prototype.CIRCLE='circle';        //画的形状  
GeoQuery.prototype.COLORS=["#0000ff", "#00ff00", "#ff0000"];  //圆的颜色  
var COLORI=0;             //默认颜色为0  
  
GeoQuery.prototype = new GeoQuery();  
GeoQuery.prototype._map;  
GeoQuery.prototype._type;  
GeoQuery.prototype._radius;  
GeoQuery.prototype._dragHandle;  
GeoQuery.prototype._centerHandle; 
GeoQuery.prototype._polyline1;  
GeoQuery.prototype._polyline2; 
GeoQuery.prototype._color;  
GeoQuery.prototype._control;  
GeoQuery.prototype._points1; 
GeoQuery.prototype._points2; 
GeoQuery.prototype._dragHandlePosition;  
GeoQuery.prototype._centerHandlePosition;
GeoQuery.prototype.markers;
GeoQuery.prototype.centers;
GeoQuery.prototype.polylines;
/** 
 * 
 * 圆的加载 
 * 
 */  
GeoQuery.prototype.initializeCircle = function(radius1,radius2,point, map){
    this._type = this.CIRCLE;    //圆形   
    this._radius1 = radius1;     //半径1
	this._radius2 = radius2;     //半径2
    this._map = map;      //地图
   
	//计算扩大圆的点的位置  
	 var distance1 = this._radius1/1000;  
	 var newPoint = destination(point,180,distance1);  
	 distance1 = distance(point,newPoint);
	 

      
    this._dragHandlePosition = destination(point, 90, distance1);   
    //设置扩大圆的点的样式  
		this._dragHandle = new google.maps.Marker({
        position: this._dragHandlePosition,   
        map: map,  
		draggable:true,  
        icon:"resizeArrow.png"  
    });
 //中心点的位置  
    this._centerHandlePosition = point;  
 //设置中心点的样式  
    this._centerHandle = new google.maps.Marker({
        position: this._centerHandlePosition,   
        map: map,  
		draggable:true,  
		flat:false
    });
    
 //随机获取颜色  
    this._color = this.COLORS[(COLORI++) % 3];  
	
	//在地图上加载圆形  
    this._dragHandle.setMap(map); 
    this._centerHandle.setMap(map);  
   
    var myObject = this;  
 //扩大圆的点的拖拽事件  
	google.maps.event.addListener(myObject._dragHandle, 'drag', function() {myObject.updateCircle(1);});  
	
   
 //跳出的infowindow
	google.maps.event.addListener(myObject._dragHandle, 'drag', function(){myObject.updateCircle(1);});  
   
 //圆的中心点的点击事件  
	google.maps.event.addListener(myObject._centerHandle, 'click', function(){
	  infowindow.setContent("我的窗口");  
	  infowindow.open(myObject._centerHandle.get('map'), myObject._centerHandle);  
    });  
 //圆的中心点的拖拽停止事件
 /*
 google.maps.event.addListener(myObject._centerHandle, 'dragend', function() {  
  myObject.updateCircle(2);  
    
  alert(myObject._dragHandlePosition);  
  alert(myObject._radius);  
 });
*/
 //圆的中心点的拖拽事件  
 google.maps.event.addListener(myObject._centerHandle,'drag', function() {myObject.updateCircle(2);});
 var flightPlanCoordinates=[
        new google.maps.LatLng(37.772323, -122.214897),
        new google.maps.LatLng(21.291982, -157.821856),
        new google.maps.LatLng(-18.142599, 178.431),
        new google.maps.LatLng(-27.46758, 153.027892)
 ];
 new google.maps.Marker({
        position: new google.maps.LatLng(37.772323, -122.214897), 
        map: map,
        title:"Hello World!"
});
 new google.maps.Marker({
        position: new google.maps.LatLng(21.291982, -157.821856),
        map: map,
        title:"Hello World!"
    });
 new google.maps.Marker({
        position: new google.maps.LatLng(-18.142599, 178.431),
        map: map,
        title:"Hello World!"
    });
new google.maps.Marker({
        position: new google.maps.LatLng(-27.46758, 153.027892),
        map: map,
        title:"Hello World!"
});
new google.maps.Polyline({
      path: flightPlanCoordinates,
      strokeColor: "#FF0000",
      strokeOpacity: 1.0,
      strokeWeight: 2,
	  map:map
 });
}
  
/** 
 * 
 * 圆的修改
 * type:1为扩大缩小点，其他为中心点 
 * 
 */  
GeoQuery.prototype.updateCircle = function(type){
  this._polyline1.setMap(null);  
  this._polyline2.setMap(null);  
    if (type==1) {
      this._dragHandlePosition = this._dragHandle.getPosition();  
      this._radius1 = distance(this._centerHandlePosition, this._dragHandlePosition) * 1000;
	  this._radius2 = distance(this._centerHandlePosition, this._dragHandlePosition) * 1000;
      this.render();  
    }else{
      this._centerHandlePosition = this._centerHandle.getPosition();  
      this.render();  
      this._dragHandle.setPosition(this.getEast());  
    }   
}
/** 
 * 
 * 圆的渲染 
 * 
 */  
GeoQuery.prototype.render = function() {
	  if (this._type == this.CIRCLE) {
		this._points1 = [];  
		this._points2 = [];  
		
	 //var dis = distance(this._points[0],this._points[1])/2;  
	 //var newPoint = destination(this._points[0],180,dis);  
	 
		var distance1 = this._radius1/1000;
		var distance2 = this._radius2/1000;
		  
		for (i = 0; i < 72; i++) {
			  this._points1.push(destination(this._centerHandlePosition, i * 360/72, distance1));  
		}
		for (i = 0; i < 72; i++) {
			  this._points2.push(destination(this._centerHandlePosition, i * 360/72,distance2));  
		}
	this._polyline1 = new google.maps.Polygon({
		  paths: this._points1,  
		  strokeColor: "#00FF00",  
		  strokeOpacity: 0.8,  
		  strokeWeight: 2,  
		  fillColor: "#00FF00",  
		  fillOpacity: 0.35  
		});   
		this._polyline1.setMap(this._map);
		this._polyline2 = new google.maps.Polygon({
		  paths: this._points2,  
		  strokeColor: "#FF0000",  
		  strokeOpacity: 0.8,  
		  strokeWeight: 2,  
		  fillColor: "#FF0000",  
		  fillOpacity: 0.35  
		});   
		this._polyline2.setMap(this._map);
		/*
		google.maps.event.addListener(this, 'drag', function() {
			this._radius+=100;
		});
		*/
	  }
}
  
  
/** 
 * 
 * 圆的删除 
 * 
 */  
GeoQuery.prototype.remove = function() {  
 this._polyline1.setMap(null);  
  this._polyline2.setMap(null);  
 this._dragHandle.setMap(null);  
 this._centerHandle.setMap(null);  
}
  
GeoQuery.prototype.getRadius = function() {  
    return this._radius;  
}  
  
GeoQuery.prototype.getHTML = function() {  
  return "<span><font color='"+ this._color + "''>" + this.getDistHtml() + "</font></span>";  
}
GeoQuery.prototype.getDistHtml = function(){
  result = "<img src='http://jfno.net/images/close.gif' onClick='myQueryControl.remove(" + this._control.getIndex(this) + ");'/>Radius ";  
  if (metric) {
    if (this._radius < 1000) {  
      result += "in meters : " + this._radius.toFixed(1);  
    } else {  
      result += "in kilometers : " + (this._radius / 1000).toFixed(1);  
    }  
  } else {  
    var radius = this._radius * 3.2808399;  
    if (radius < 5280) {  
      result += "in feet : " + radius.toFixed(1);  
    } else {  
      result += "in miles : " + (radius / 5280).toFixed(1);  
    }  
  } 
  return result;     
}  
  
GeoQuery.prototype.getNorth = function() {  
  return this._points[0];  
}
  
GeoQuery.prototype.getSouth = function() {  
  return this._points[(72/2)];  
}  
  
GeoQuery.prototype.getEast = function() {  
   
 var dis = distance(this._points1[0],this._points1[1])/2;  
 var newPoint = destination(this._points1[0],180,dis);  
 return newPoint;   
  //return this._points[(72/4)];  
}  
  
GeoQuery.prototype.getWest = function(){  
  return this._points1[(72/4*3)];  
}
</script>
</head>  
<body onload="displayMap();" style="width: 100%; height: 100%; margin: 0px;">  
 <div id="map" style="width: 100%; height: 95%;"></div>  
 <!--<div style="font-family: arial, sans-serif;">Made by <a href="http://www.3rdcrust.com">3rdCrust.com</a></div>  
 <div id="QueryControl"></div>  
 <div id="ads">  
 </div --> 
</body>  
</html>