很久沒有關注DeepEarth的更新進展了，昨晚上CodePlex看發現DeepEarth已經更新到Silverlight 4版本了，并且做了許多的改變，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)

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　　DeepEarth從Silverlight 3升級到了Silverlight 4，在幾何框架中并通過新創建的LocationBase類替換了原來在Silverlight版本中的PointBase基類，并使用了經度（Longitude）和緯度(Latitude)替換了舊版本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;
????????????}
????????}

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　　同時還為MapControl啟用了硬件加速的支持，另外還優化了DeepEarth的內置控件，升級到Silverlighg 4后我們可以在VS2010或是Blend4中設計更佳美觀、炫麗的UI效果。

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推薦資源：

　　DeepEarth開發文章匯總

?????【Silverlight】Bing Maps系列文章

???? http://deepearth.codeplex.com/

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