C# Drag the image and zoom in and out, use a lot of three plug-ins, such as AxInterop.OWC10.dll, AxSHDocVw.dll, Interop.OWC10.dll, Microsoft.Office.Interop.Graph.dll, Microsoft.Office.Interop. PowerPoint.dll, SHDocVw.dll, office.dll so that methods of program implementation is not too simple, with so many additional controls, and the function does not seem to realize is proportional to, huh, huh, personal opinion.

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