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Logic to calculate bendpoints for a polyline connection in rectilinear routing [message #210521]

Thu, 06 November 2008 02:06

Eclipse User

Hi All!

I am using the GMF plugin (1.0.3) and the draw2d API.

I want to understand how the bendpoints of a PolyLineConnection are
calculated in case of rectilinear routing.

I did debug the code from examples and found out vaguely how the
bendpoints are calculated and how the actual routing happens. I was
looking at the calculateBendPoints method of BorderItemRectilinearRouter
class. In this method, I saw that the algorithm builds from the "original
bendpoints"
List originalbendpoints = (ArrayList) conn.getConnectionRouter()
.getConstraint(conn);

I could not figure out how these original bendpoints are calculated.
Could someone explain the standard way in which the bendpoints are
calculated?
Any pointers to the code or articles would be extremely helpful.

Thanks,
Ramya

Re: Logic to calculate bendpoints for a polyline connection in rectilinear routing [message #210782 is a reply to message #210521]

Mon, 10 November 2008 03:15

Eclipse User

After some organized and patient debugging, I figured out how the original
bendpoints are calculated. For anyone who still is interested in knowing
about this, you can look at the method doExecuteWithResult in the class
org.eclipse.gmf.runtime.diagram.ui.internal.commands.SetConn ectionBendpointsCommand.

After the initial set of bend points are calculated, the
ConnectionEditPart class refreshes the bendpoints in the method
refreshBendpoints to create RelativeBendPoint list that is understood by
the concerned rectilinear router.

Thanks,
Ramya

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