Andrew Murdoch wrote:
>
> Thanks David,
>
> I got an email earlier from Joern Clausen with a link to his
> Google/Earthquake page (http://www.oe-files.de/gmaps/usgseq.html) and
> javascript which was helpful. I want to do similar work, but I also
> want to lay the groundwork for animating the map display when the user
> drags the event painter across the lower timeline band. Your
> suggestion to use the "addOnSelectListener" function sounds
> promising. I'll want to get a list of multiple events that fall
> within the selected time window, associate them with their lat/long
> coords and plot the coords on the map.
The getMinVisibleDate() and getMaxVisibleDate() on a band object should
give you that range--see
http://simile.mit.edu/timeline/api/scripts/timeline.js
Then, the getEventIterator() on the event source object should give you
an iterator over events in that range--see
http://simile.mit.edu/timeline/api/scripts/sources.js
> I'm not quite sure how to associate a Timeline event with lat and long
> coords (drawn from the original GeoJSON data source). Maybe when I
> initially parse my input GeoJSON to Timeline events I could add my
> array of Timeline events to another array with lat and long coords
> stored as well. Then when I use the SelectListener to get the
> selected events, I can loop through the second (event, lat and long)
> array evaluating whether the event is the same as the current selected
> event. That's assuming that it makes sense to evaluate event objects
> against each other. Would I instead have to evaluate a property of
> the event object (like an eventid)?
I'd recommend looking at Exhibit first,
http://simile.mit.edu/exhibit/
The first example does something similar to what you want.
> Is there a better way to store lat and long coords with events that
> doesn't require me to loop through an array of the entire event data
> set? Maybe some way to add properties to a Timeline event? That way
> when I use SelectListener to get selected events, I could already have
> the lat and long coords at the ready. It might make the map display a
> lot faster.
>
> If I also wanted to establish a "pre-canned" animation sequence at the
> click of a button, how would I go about that? Are there methods to
> move the event painter smoothly across a time range all within a
> certain duration of "real" time? That would be perfect.
>
> I think I'm getting a handle on this now. I'll keep you posted on my
> progress (I'll let you know when I get stuck again)! Hopefully, I
> will be able to post a website to the Internet sometime in the next month.
>
> Thanks again,
> Andrew Murdoch
>
>
> ------------------------------------------------------------------------
> > Date: Mon, 17 Dec 2007 23:23:19 -0500
> > From: [EMAIL PROTECTED]
> > To: general@simile.mit.edu
> > Subject: Re: Synchronizing Timeline and OpenLayers javascript
> mapping library
> >
> > Andrew,
> >
> > Is this close to what you're thinking?
> > http://www.oe-files.de/gmaps/usgseq.html
> >
> > If you're using Timeline version 2.0
> > http://static.simile.mit.edu/timeline/api-2.0/timeline-api.js
> > then you can add a select listener like so
> > tl.getBand(0).getEventPainter().addOnSelectListener(function(eventID) {
> > var evt = tl.getBand(0).getEventSource().getEvent(eventID);
> > ... do something with evt ...
> > });
> >
> > And to pop up a bubble on the timeline for a particular event (given
> its
> > ID):
> > tl.getBand(o).showBubbleForEvent(eventID);
> >
> > David
> >
> > Andrew Murdoch wrote:
> > > Hello,
> > >
> > > I'm trying to get the SIMILE Timeline tool to synchronize events
> > > between the timeline bars and an OpenLayers GIS web-map interface.
> > > Has anyone done similar work?
> > >
> > > My initial plans to solve this problem include getting data from the
> > > Geoserver web-map server (supplying GIS data to OpenLayers) in
> GeoJSON
> > > format. It seems that Timeline expects a particular format for JSON
> > > (or XML) input files however, so it seems I need to parse my GeoJSON
> > > attribute data and create a Timeline formatted JSON (or XML) file on
> > > the fly. Ideally, Timeline would let you tie certain attribute
> > > properties from the GeoJSON file to the needed Timeline properties
> > > (start, end, etc.) but I think I'll be able to reformat my data in
> > > javascript for the Timeline tool.
> > >
> > > My question is how to synchronize the event source loaded into
> > > Timeline with the map frame presented by OpenLayers. Is there a way
> > > to extract the events shown in the highlighted slider bar to JSON or
> > > XML format on the fly? Should I wait for a mouse-up event to extract
> > > the events shown? Once I have a JSON file of events (with their
> > > latitude and longitude attributes) I think I can load the JSON into
> > > OpenLayers as a Vector Layer and refresh the map. I may need to
> > > reformat the Timeline output back to GeoJSON format for import to
> > > OpenLayers however.
> > >
> > > Does it sound like I'm on the right track, or am I making this way
> > > too complicated? What methods do I need to call to extract the events
> > > shown in the highlighted slider bar and what format would that
> extract
> > > be in? Are there JSON javascript libraries I should consider using
> > > for the format conversions back and forth between Timeline JSON
> format
> > > and GeoJSON format?
> > >
> > > Thanks so much for your consideration of this problem.
> > > Andrew Murdoch
> > >
> > >
> ------------------------------------------------------------------------
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