之前写了篇博文,深入理解最强桌面地图控件GMAP.NET — 百度地图
但是很多回复说百度地图更新了,不能显示百度的离线地图。之前承诺说是国庆节更新,最近才更新。代码已经提交到:
https://code.google.com/p/ypmap/
其实算法都是一样的,只是链接变了,
//原来:http://q3.baidu.com/it/u=x=721;y=209;z=12;v=014;type=web&fm=44
//更新:http://online1.map.bdimg.com/tile/?qt=tile&x=23144&y=6686&z=17&styles=pl
因此只要将BaiduMapProviderBase改成下面的代码即可
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Text;
using System.Xml;
using GMap.NET.Internals;
using GMap.NET.MapProviders;
using GMap.NET.Projections;namespace GMap.NET.GMap.NET.MapProviders.Baidu
{
public abstract class BaiduMapProviderBase : GMapProvider
{
private string ClientKey = "1308e84a0e8a1fc2115263a4b3cf87f1";
public BaiduMapProviderBase()
{
MaxZoom = null;
RefererUrl = "http://map.baidu.com";
Copyright = string.Format("©{0} Baidu Corporation, ©{0} NAVTEQ, ©{0} Image courtesy of NASA", DateTime.Today.Year);
} public override PureProjection Projection
{
get { return MercatorProjection.Instance; }
} GMapProvider[] overlays;
public override GMapProvider[] Overlays
{
get
{
if (overlays == null)
{
overlays = new GMapProvider[] { this };
}
return overlays;
}
}
} public class BaiduMapProvider : BaiduMapProviderBase
{
public static readonly BaiduMapProvider Instance; readonly Guid id = new Guid("608748FC-5FDD-4d3a-9027-356F24A755E5");
public override Guid Id
{
get { return id; }
} readonly string name = "BaiduMap";
public override string Name
{
get
{
return name;
}
} static BaiduMapProvider()
{
Instance = new BaiduMapProvider();
} public override PureImage GetTileImage(GPoint pos, int zoom)
{
string url = MakeTileImageUrl(pos, zoom, LanguageStr); return GetTileImageUsingHttp(url);
} string MakeTileImageUrl(GPoint pos, int zoom, string language)
{
zoom = zoom - ;
var offsetX = Math.Pow(, zoom);
var offsetY = offsetX - ; var numX = pos.X - offsetX;
var numY = -pos.Y + offsetY; zoom = zoom + ;
var num = (pos.X + pos.Y)% + ;
var x = numX.ToString().Replace("-", "M");
var y = numY.ToString().Replace("-", "M"); //原来:http://q3.baidu.com/it/u=x=721;y=209;z=12;v=014;type=web&fm=44
//更新:http://online1.map.bdimg.com/tile/?qt=tile&x=23144&y=6686&z=17&styles=pl
string url = string.Format(UrlFormat, x, y, zoom);
Console.WriteLine("url:" + url);
return url;
} static readonly string UrlFormat = "http://online1.map.bdimg.com/tile/?qt=tile&x={0}&y={1}&z={2}&styles=pl"; }
}