Split a polygon using a line from a different theme

Summary

This article provides sample Avenue code that splits a polygon feature using a selected line from a different theme.

Procedure

1. Open a new script window.
   
   
   A. Activate the Project window.
   B. Click the Scripts icon.
   C. Click New.
   
   
2. Paste the following code into the new window:
   
   

   Code:
   theView = av.GetActiveDoc
   t = theView.GetThemes
   splitTheme = msgbox.choice(t,"","Choose the line theme with the selected line")
   
   theProjection = theView.GetProjection
   theFtab = splitTheme.GetFTab
   theShapeField = theFtab.FindField("Shape")
   
   thebit = theFtab.GetSelection
     
     for each x in thebit
     aShape = theFtab.ReturnValue(theShapeField, x)
     if (theProjection.IsNull) then 
       aGraphic = GraphicShape.Make(aShape.ReturnProjected(theProjection))
     else
       aGraphic = GraphicShape.Make(aShape)
     end
     if (aShape.Is(Polygon)) then
         msgbox.info("You must choose a line theme","Warning")
      end
   end
   theTheme = theView.GetEditableTheme
   
      if (theTheme <> nil) then
       theTheme.GetFtab.BeginTransaction
       theField = theTheme.GetFTab.FindField("Shape")
       theType = theField.GetType
       if ((theType = #FIELD_SHAPEPOLY) or (theType = #FIELD_SHAPELINE)) then
         theTheme.Split(aShape)
       end
       theTheme.GetFtab.EndTransaction
     end  
     av.GetProject.SetModified(true)
   

   
   
3. Attach the script to a button on the View GUI.
   
   
   A. Compile the script.
   B. Switch to the Project window.
   C. Select Customize from the Project menu.
   D. On the Customize dialog box, click the Type dropdown arrow and click View.
   E. Select Buttons under Category.
   F. Click the New button.
   G. Double-click the Click property in the Customize dialog box.
   H. Type the name of the script in the Script Manager and click Select.
   I. Close the Customize dialog box.
   
   For more information, see "Customize dialog box" in ArcView Help.
   
   
4. Open the view and make the polyline theme active.
5. Select the line that will split the polygon.
6. Make the polygon theme active and select Start Editing from the Theme menu.
7. Click the new button.
8. Select Stop Editing from the Theme menu.