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Splitting connections [message #1042685]

Tue, 16 April 2013 18:59

Hallvard Traetteberg

Messages: 673
Registered: July 2009
Location: Trondheim, Norway

Senior Member

Hi,

I'm implementing functionality for splitting a connection. If the
connection is a free form connection with connection points, I'd like to
move connection points to the appropriate resulting connections, so the
overall shape does not change (although there's a new node in-between).

To do so, I need to iterate over all the line segments of the
connection, but I cannot find out how to find the location of the start
and end anchors. I seems these are not stored in the connection or
anchors and instead are computed by the GEF implementation?

Another solution would be to have the context object provide the
"segment number" in addition to the x,y location, but that is not
implemented?

Hallvard

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Re: Splitting connections [message #1046866 is a reply to message #1042685]

Mon, 22 April 2013 13:29

Michael Wenz

Messages: 1931
Registered: July 2009
Location: Walldorf, Germany

Senior Member

Hallvard,

right, the location of the start and end anchors are not stored in the
connection. They are partly calcutaled and set on GEF leven, partly set as
relative coordinates on the shapes resp. their anchors. Each graphics
algorithm of an shape has relative coordinates stating its position relative
to the next upper active shape. Anchors are just like shapes, so they hold a
position and size you could use to compute the position. This is true for at
least Fixpoint and BoxRelative anchors, Chopbox anchors are always in the
middle of their parent.

The segment is currently not part of the context information, but maybe it
would make sense to add it?

Michael

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Re: Splitting connections [message #1047033 is a reply to message #1046866]

Mon, 22 April 2013 17:50

Hallvard Traetteberg

Messages: 673
Registered: July 2009
Location: Trondheim, Norway

Senior Member

On 22.04.13 06.29, Michael Wenz wrote:
>
> right, the location of the start and end anchors are not stored in the
> connection. They are partly calculated and set on GEF level, partly set
> as relative coordinates on the shapes resp. their anchors. Each graphics
> algorithm of an shape has relative coordinates stating its position
> relative to the next upper active shape. Anchors are just like shapes,
> so they hold a position and size you could use to compute the position.
> This is true for at least Fixpoint and BoxRelative anchors, Chopbox
> anchors are always in the middle of their parent.

Would it make sense for the anchor to have an EOperation computing the
position? Then a client needn't duplicate logic that anyway needs to be
in Graphiti?

> The segment is currently not part of the context information, but maybe
> it would make sense to add it?

I think so, since it makes sense to implement operations that are
segment-aware. Should I file a bug?

Hallvard

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