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DrawContext.GetClipRectangle

Method
Description:
Gets the clip rectangle for the Revit view where rendering takes place. The clip rectangle is the area currently being redrawn, which may be smaller than the view rectangle.
Syntax
public static Rectangle GetClipRectangle()
Exceptions
Exception Condition
InvalidOperationException This DrawContext is not available because Revit is not currently rendering. In general, this DrawContext must be used in the scope of the RenderScene() callback of IDirectContext3DServer.