initial commit
more on sweep line
circle circle intersection
circle-segment and segment-segment intersection
fix resolution on retina display in chrome
remove endpoints
d3 / svg rendering
basic interaction with control points
refactor
define circles by two points.
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refactor: scene class
in progress: scene building
drop canvas rendering
cleanup for browser
background-like example
nicer interface for scene building
add failing test for unique intersections
revamp intersections
try collapsing equal points...