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SJasinski
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Prevent cycles
Sep 13th, 2005 at 1:59pm
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I am porting our product from lasal's addflow to your component. Now there's only one thing I can't find how to do with flowchart.net, namely preventing users from drawing cycles in the diagram. That's done by setting one property in lasal's control, can you suggest how to do it with yours or can you add such a feature, please ?

thank you
  
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Stoyo
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Re: Prevent cycles
Reply #1 - Sep 14th, 2005 at 10:33am
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Hi,

Try using the PathFinder.FindCycle from the ArrowCreating event. If there is a cycle found, do not allow the arrow to be created, i.e. set eargs.Confirm = false.

Stoyan
  
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SJasinski
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Re: Prevent cycles
Reply #2 - Sep 14th, 2005 at 1:00pm
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Nope that doesn't work. it seems the cycle is not there yet when that event is raised... any other suggestions please ?
  
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Stoyo
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Re: Prevent cycles
Reply #3 - Sep 14th, 2005 at 1:50pm
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Oh, try this:
Handle ArrowCreating, if there is path going from the new arrow's Destination to its Origin, then adding that arrow would produce a cycle. So use PathFinder.FindShortestPath(dest, origin) and if there's one found set the event arg Confirm = false.
  
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SJasinski
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Re: Prevent cycles
Reply #4 - Sep 14th, 2005 at 2:25pm
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Great thanks, I should have thought of this myself  Grin
  
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