Fast refresh
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Please refer to the project  "Editor"  which is located in the SeeDraw Samples folder.


// Render background object.


// Move the current vertex to other position.

m_object.SetWindowVertex(curnodeIdx, new SeeDraw.sdGeometry.Point2D(e.X, e.Y));

// Redraw the object 


// Update all the entities that Drawn by DrawEntity to the screen.



Fast refresh can only be used in the condition that the 

background is a static drawing !!!