DeepEarth更新到Silverlight 4了

　　很久没有关注DeepEarth的更新进展了，昨晚上CodePlex看发现DeepEarth已经更新到Silverlight 4版本了，并且做了许多的改变，主要包括如下：

　　Added SL4 branch folders.
　　Added upgraded SL4 GeoAPI, NetTopologySuite.
　　Added SL4 Silverlight toolkit library dlls (April 2010).

　　Upgraded DeepEarth MapControl to Silverlight 4
　　Upgraded all DeepEarth TileProviders to Silverlight 4
　　Upgrade DeepEarth MapControl to use Silverlight 4 inbuilt MouseWheel Events
　　Create new LocationBase class to replace the PointBase class, and uses Latitude & Longitude
　　Enable Hardware Acceleration for the MapControl
　　Upgraded the core controls (navigation, coordinates etc) to Silverlight 4 & integrate with map project.
　　Fixed Styles for controls and C# code to allow Styles/Templates to display correctly at design time in both VS2010 & Blend 4 RC
　　Remove the dependicy/referance to NetopologySuite Project and include the relevant parts in our code, upgraded to SL4 code.
　　Provide an example of a separate control that is a separate project interacting with the map = eg, layer control.
　　Tested everything works in Out of Browser Mode (OOB)

　　DeepEarth从Silverlight 3升级到了Silverlight 4，在几何框架中并通过新创建的LocationBase类替换了原来在Silverlight版本中的PointBase基类，并使用了经度（Longitude）和纬度(Latitude)替换了旧版本PointBase中使用的X,Y。

        /// <summary>
        /// The Latitude coordinate of the point
        /// </summary>
        public double Longitude
        {
            get { return Point.X; }
            set
            {
                _Point.X = value;
                Point = _Point;
            }
        }

        /// <summary>
        /// The Longitude coordinate of the point
        /// </summary>
        public double Latitude
        {
            get { return Point.Y; }
            set 
            {
                _Point.Y = value;
                Point = _Point;
            }
        }

　　同时还为MapControl启用了硬件加速的支持，另外还优化了DeepEarth的内置控件，升级到Silverlighg 4后我们可以在VS2010或是Blend4中设计更佳美观、炫丽的UI效果。

推荐资源：

　　DeepEarth开发文章汇总

     【Silverlight】Bing Maps系列文章

     http://deepearth.codeplex.com/