[OpenLayers-Users] Animating a Polyline to Simulate Fluid Flow in a
bthoen at gisnet.com
Sat Aug 23 19:33:37 EDT 2008
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://220.127.116.11/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
improve it, or any new ideas for animating lines.
So Long, and Thanks for All the Fish,
- Bill Thoen
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