I am still interested in knowing who (meaning other turtles) are
linked to a given turtle, either to or from. Is this data available to
be accessed through LinkManager and if so, do you have a suggestion
for how to do so?
For clarity, I'd like to point out that links are created with the
`create-link*` primitives
<http://ccl.northwestern.edu/netlogo/docs/dictionary.html#linkgroup>.
That is, links between turtles are created in your model's NetLogo
code. To get at link information from within Java code, you /could/ use
`LinkManager` and its `findLink*` methods, but I don't see those methods
as helpful for visualization purposes. Instead, I think you would want
to get a handle on the collection of links in the model, which you can
do by using `workspace.world().links()` (similar to how you got ahold of
the turtles). Then, you can iterate over the collection, looking at
each link, looking up the corresponding turtle on each end, and drawing
the visual link between them.
And is "who is linked to who" part of the updates provided in the
diffs method of Mirroring?
Yes, updates are given with information about newly-created, modified,
and deleted links. Link updates are their own category of updates
(alongside the categories for patches, turtles, and the "observer").
On 05/19/2014 03:40 PM, Brant Horio wrote:
Many thanks Jason for the quick reply. Yes, you are correct that I
want to run NetLogo headlessly and provide my own version of the
NetLogo view. This visualization is using Processing and will for the
most part act independently from what the NetLogo view has been coded
to show in the model. I'll look into the Mirroring, many thanks as I
had not known about that.
A quick comment regarding the links: I am still interested in knowing
who (meaning other turtles) are linked to a given turtle, either to or
from. Is this data available to be accessed through LinkManager and if
so, do you have a suggestion for how to do so? And is "who is linked
to who" part of the updates provided in the diffs method of Mirroring?
Thanks for your patience with me. I really appreciate your time.
Thanks,
Brant
On Monday, May 19, 2014 4:06:52 PM UTC-4, Jason Bertsche wrote:
`LinkManager` is for NetLogo links
<http://ccl.northwestern.edu/netlogo/5.0/docs/programming.html#links>,
which are a type of visible agent in NetLogo and not exactly an
abstraction for data correlation.
What's the purpose of your correlation of turtles with other
data? NetLogo doesn't really have anything built in for saying
that a turtle is related to some other data. I'm not sure I'm
understanding your goals correctly, but, if I am, it sounds like
you just want to run NetLogo headlessly and provide your own
version of the NetLogo view, which, of course, is kept in sync
with the state of the model as it progresses. Is that right? If
so, and if you're dealing with the code from the 'headless' branch
of NetLogo, then take of a look at 'org.nlogo.mirror.Mirroring
<https://github.com/NetLogo/NetLogo/blob/headless/src/main/mirror/Mirroring.scala>'.
Using that and its `diffs` method, you can find out what variables
have changed in the model since your last snapshot, and then
update your visualization according to that diff.
On 05/19/2014 02:01 PM, Brant Horio wrote:
Hello all,
I am currently working on calling NetLogo headless from Java for
the purposes of doing my own non-NetLogo visualization, primarily
as just an exploratory programming exercise. I am coding in Java
and have been able to successfully read in and iterate through
the turtle agent list, reading in agent attribute values,
coordinate positions, etc, for the visualization. I do so by:
public static HeadlessWorkspace workspace =
HeadlessWorkspace.newInstance( );
public static Iterable<Agent> netLogoAgentList;
netLogoAgentList = workspace.world( ).turtles( ).agents( );
... after which I iterate through netLogoAgentList to get the
variable values, etc that I need for my visualization.
What I am envisioning is that for each of these agents read in, I
create an agent object in Java that carries the read in variable
updates from its NetLogo counterpart and my own methods for the
visualization. I also want these agent object to carry with them
an ArrayList of other agent objects that they are "linked" with,
as informed to them by updates from the NetLogo model. Are there
any suggestions out there for the best way for me to do so? I
suspect it will involve LinkManager, in particular
LinkManager.findLinksWith( ).
My current strategy (though I have found no success yet) is to do
the following:
1. iterate through netLogoAgentList, and cast as (Turtle).
* netLogoAgentList = workspace.world( ).turtles( ).agents( );
* for (Agent t : netLogoAgentList)
{
Turtle tmpAgent = (Turtle)
workspace.world().turtles().agent(t);
}
2. for each Turtle agent, tmpAgent, call
LinkManager.findLinksWith( ), using tmpAgent and
workspace.world( ).turtles( ) as arguments, the idea being I
can get back an agent set of all turtles linked to or from
turtle tmpAgent.
3. Store the linked turtles to my Java agent object in the
previously mentioned ArrayList, allowing me to later iterate
through the list and plot out the links in the NetLogo
network in my visualization.
I am produce perhaps some of the ugliest code around so I
apologize if I'm totally off base in my pseudo
code/approach/thought process. I have tried a bunch of different
things though and cannot seem to get what *I think* I should be
able to get back from LinkManager, which is the turtles that each
one is linked from/to. Any advice for how to best access the API
to get this data would be very much appreciated.
THANK YOU IN ADVANCE!!!
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