animated path on a globe canvas

[bruce Christensen]

I saw this example https://bl.ocks.org/wwymak/dcdd12937bd4643cd9b3 and I am trying to understand how the animated arcs (the animated path that the plane follows) works.  I see this example http://bl.ocks.org/duopixel/4063326 uses a stroke-dasharray , stroke-dashoffset to work but I don't think I can use stroke-dasharray on canvas.  I am sure the code in the example somewhere but I don't see it because I don't understand it. Could anyone share with me how that part of the code works and where it is? 

I am trying to create animated lines in my own test block here: http://blockbuilder.org/itsallearth/50e6ec9775b90df8193718b21e67c043.

I would appreciate any help.

Thank you,

Bruce

[bruce Christensen]

Well, I am just wondering is anyone knows the answer.  How do the animated arcs work in this example https://bl.ocks.org/wwymak/dcdd12937bd4643cd9b3 ?

How can I do it? What part of the code makes it happen?

Thank you,

Bruce

[Gordon Woodhull]

I believe it's the "great arc interpolator".

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