Setting the cursor tool
TCanvasPolygonCreationTool is instrumental in interacting with TCanvasView, or the main canvas view of GrafEdit. The current cursor tool is typically "set" through a menu or tool palette. For instance, MarsPresenter.C contains the code that creates a polygon menu item and associates it with this tool:
popup = new TMomentaryMenuItem (new TCursorToolSelectionState(new TCanvasPolygonCreationTool()));
popup->AdoptLabel (new TTextLabel (TStandardText("Polygon")));
toolsMenu->AdoptLast (popup);
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