[OpenLayers-Users] Animating a Polyline to Simulate Fluid Flow in a Pipeline

[Bill Thoen]

Thanks Erik, that's be great.  If these ideas are useful to others I'm 
happy to share via a gallery link. It's the least I can do since I 
really appreciate being able to use the OpenLayers API in the first 
place. I usually write up notes to myself when I do one of these "code 
studies," but I can also put together a short explanation of the 
algorithms and the pros and cons of the three different approaches for 
the wiki, if you think that would be useful.

- Bill Thoen

Erik Uzureau wrote:
> Hi Bill, super interesting work you've done here. Would you be
> interested in adding a link to this site on the
> gallery.openlayers.org page? Or can you think of another, better way
> to share this information with people?
>
> I have thought it over a couple of times and I can't seem to come up
> with any good place to plug this info
> in... yet I feel it might be of big help to someone else down the
> line.... I guess the best I can do is suggest
> making a wiki tutorial for it.
>
> cheers!
> e
>
>
> On Sat, Aug 23, 2008 at 6:33 PM, Bill Thoen <bthoen at gisnet.com> wrote:
>   
>> A while ago I asked a question here about how I could simulate pipeline
>> flow in a live, animated way. A couple of you responded and gave me some
>> ideas to try. So to do my bit to contribute to the commonwealth, I've
>> posted a working sampler of these ideas at
>> http://206.168.217.244/oo-js/x2.html. This page demonstrates 3 different
>> techniques showing movement along a polyline.
>>
>> Also of note are 3 great circle functions in the Point.js code. They are
>> geoDistanceTo(), geoBearingTo() and geoWaypoint(). The first calculates
>> the great circle (shortest) distance between two points on  a sphere;
>> the second calculates the great circle bearing between two points; and
>> the third determines the lat/lon coordinate of a point along a great
>> circle that is at a specified distance and bearing from a point.  The
>> math behind these comes from Ed Williams' excellent Aviation Formulary
>> site at http://williams.best.vwh.net/avform.htm.
>>
>> To anyone who actually looks into my code I apologize for its
>> amateurishness, but I've only recently started learning OpenLayers and
>> object-oriented JavaScript. I would appreciate any comments that would
>> improve it, or any new ideas for animating lines.
>>
>> So Long, and Thanks for All the Fish,
>>
>> - Bill Thoen
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>
>