vc environment development process, multi-document can set the background graphics region: grid form can drawcircle, a straight line, you can save, save it as a txt file save the contents of the coordinates of the image, save again after the open

demo
....\EditorDemo
....\..........\DiagramEditor
....\..........\.............\DiagramClipboardHandler.cpp
....\..........\.............\DiagramClipboardHandler.h
....\..........\.............\DiagramEditor.cpp
....\..........\.............\DiagramEditor.h
....\..........\.............\DiagramEntity.cpp
....\..........\.............\DiagramEntity.h
....\..........\.............\DiagramEntityContainer.cpp
....\..........\.............\DiagramEntityContainer.h
....\..........\.............\DiagramLine.cpp
....\..........\.............\DiagramLine.h
....\..........\.............\DiagramMenu.cpp
....\..........\.............\DiagramMenu.h
....\..........\.............\DiagramPropertyDlg.cpp
....\..........\.............\DiagramPropertyDlg.h
....\..........\.............\GroupFactory.cpp
....\..........\.............\GroupFactory.h
....\..........\.............\HitParams.h
....\..........\.............\HitParamsRect.h
....\..........\.............\Tokenizer.cpp
....\..........\.............\Tokenizer.h
....\..........\.............\UndoItem.cpp
....\..........\.............\UndoItem.h
....\..........\DiagramEditorDemo.cpp
....\..........\DiagramEditorDemo.dsp
....\..........\DiagramEditorDemo.dsw
....\..........\DiagramEditorDemo.h
....\..........\DiagramEditorDemo.rc
....\..........\DiagramEditorDemoDlg.cpp
....\..........\DiagramEditorDemoDlg.h
....\..........\GridSizeDialog.cpp
....\..........\GridSizeDialog.h
....\..........\PaperSizeDialog.cpp
....\..........\PaperSizeDialog.h
....\..........\res

....\..........\...\DiagramEditorDemo.rc2
....\..........\resource.h
....\..........\StdAfx.cpp
....\..........\StdAfx.h
....\..........\TextFile.cpp
....\..........\TextFile.h

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