<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Direction_Complex.aspx.cs"
Inherits="Samples.Services.Direction_Complex" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>路线查询</title>
<style type="text/css">
#maps
{
height: 450px;
}
</style>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&language=zh-CN"></script>
<script language="javascript" type="text/javascript">
var map; //申明地图对象
var directionDisplay; //申明路线显示对象
var directionsService; //申明路线查询服务
var stepDisplay; //申明路线步骤对象
var markerArray = []; //申明标记数组
//地图初始化函数
function initialize() {
// Instantiate a directions service.
//创建路线查询服务实例
directionsService = new google.maps.DirectionsService();
// Create a map and center it on Manhattan.
var manhattan = new google.maps.LatLng(40.7711329, -73.9741874);
var myOptions = {
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: manhattan
}
map = new google.maps.Map(document.getElementById("maps"), myOptions);
// Create a renderer for directions and bind it to the map.
//创建一个路线呈现对象并绑定到地图
var rendererOptions = {
map: map
}
//实例化路线显示对象
directionsDisplay = new google.maps.DirectionsRenderer(rendererOptions)
// Instantiate an info window to hold step text.
//创建信息窗口实例来显示步骤信息
stepDisplay = new google.maps.InfoWindow();
calcRoute();
}
//计算路线函数
function calcRoute() {
// First, remove any existing markers from the map.
//首先删除所有的标记
for (i = 0; i < markerArray.length; i++) {
markerArray[i].setMap(null);
}
// Now, clear the array itself.
//清空标记数组
markerArray = [];
// Retrieve the start and end locations and create
// a DirectionsRequest using WALKING directions.
var start = document.getElementById("start").value;
var end = document.getElementById("end").value;
var request = {
origin: start,
destination: end,
travelMode: google.maps.DirectionsTravelMode.WALKING
};
// Route the directions and pass the response to a
// function to create markers for each step.
//根据计算出来的路线并调用步骤显示函数来创建标记
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
var warnings = document.getElementById("warnings_panel");
warnings.innerHTML = "<b>" + response.routes[0].warnings + "</b>";
directionsDisplay.setDirections(response);
showSteps(response);
}
});
}
//步骤显示函数
function showSteps(directionResult) {
// For each step, place a marker, and add the text to the marker's
// info window. Also attach the marker to an array so we
// can keep track of it and remove it when calculating new
// routes.
//获取步骤地址数组
var myRoute = directionResult.routes[0].legs[0];
//为每一个步骤地址创建标记
for (var i = 0; i < myRoute.steps.length; i++) {
var marker = new google.maps.Marker({
position: myRoute.steps[i].start_point,
map: map
});
//显示步骤信息
attachInstructionText(marker, myRoute.steps[i].instructions);
markerArray[i] = marker;
}
}
//显示步骤信息函数 当点击标记时打开信息窗口并在其中显示步骤信息
function attachInstructionText(marker, text) {
google.maps.event.addListener(marker, 'click', function() {
// Open an info window when the marker is clicked on,
// containing the text of the step.
stepDisplay.setContent(text);
stepDisplay.open(map, marker);
});
}
//将地图初始化函数绑定到window的load事件
google.maps.event.addDomListener(window, "load", initialize);
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<b>Start: </b>
<select id="start" onchange="calcRoute();">
<option value="penn station, new york, ny">Penn Station</option>
<option value="grand central station, new york, ny">Grand Central Station</option>
<option value="625 8th Avenue New York NY 10018">Port Authority Bus Terminal</option>
<option value="staten island ferry terminal, new york, ny">Staten Island Ferry Terminal</option>
<option value="101 E 125th Street, New York, NY">Harlem - 125th St Station</option>
</select>
<b>End: </b>
<select id="end" onchange="calcRoute();">
<option value="260 Broadway New York NY 10007">City Hall</option>
<option value="W 49th St & 5th Ave, New York, NY 10020">Rockefeller Center</option>
<option value="moma, New York, NY">MOMA</option>
<option value="350 5th Ave, New York, NY, 10118">Empire State Building</option>
<option value="253 West 125th Street, New York, NY">Apollo Theatre</option>
<option value="1 Wall St, New York, NY">Wall St</option>
</select>
</div>
<div id="maps">
</div>
<div id="warnings_panel" style="width: 100%; height: 10%; text-align: center">
</div>
</form>
</body>
</html>
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