Gives the distance between an event and the line formed by two nodes.
Gives the distance between an event and the line (not segment) formed by two nodes.
## S3 method for class 'netTools' PointToLine(obj)
obj
: netTools object -> list(p1:c(coordx, coordy), p2:c(coordx, coordy), e:c(coordx, coordy))the distance to the line
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