attribution.txt

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"How to constrain movement within the area of a circle"
http://stackoverflow.com/a/8528999
By http://stackoverflow.com/users/524555/duopixel


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"Change in mouse position when viewbox is added"
http://stackoverflow.com/a/11936865
By http://stackoverflow.com/users/109374/erik-dahlstr%C3%B6m
References:
http://www.codedread.com/blog/archives/2005/12/21/how-to-enable-dragging-in-svg/
Demo: http://www.codedread.com/dragtest.svg


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"SVG how to get the mouse position on the internal matrix"
http://stackoverflow.com/q/21852543
By http://stackoverflow.com/users/1310814/serverbloke

(also https://msdn.microsoft.com/en-us/library/hh535760(v=vs.85).aspx )


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"How to scale SVG image to fill browser window?"
http://stackoverflow.com/a/5644436
http://phrogz.net/svg/svg_in_xhtml5.xhtml
By http://stackoverflow.com/users/405017/phrogz


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Point class
https://github.com/moagrius/Point/blob/master/Point.js


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Basic collisions
http://devmag.org.za/2009/04/13/basic-collision-detection-in-2d-part-1/
http://devmag.org.za/2009/04/17/basic-collision-detection-in-2d-part-2/


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Test if point is on a line segment
http://stackoverflow.com/questions/328107/how-can-you-determine-a-point-is-between-two-other-points-on-a-line-segment/328193#328193


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Find intersections of a line segment and a circle
https://bl.ocks.org/milkbread/11000965


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How can I share code between Node.js and the browser?
http://stackoverflow.com/a/8420905


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"fat models, skinny controllers, stupid views"
http://softwareengineering.stackexchange.com/a/101865