Get Radial Sets pointer location

Build tooltip for radial sets network plot

getPointerLoc(metadata, pointer, plotDomain = list(left = -1.08, right =
  1.08, bottom = -1.08, top = 1.08), transCoord = FALSE)

Arguments

metadata	A list of data frames from getRadialSetsMetadata
pointer	A named list created by plotOutput
plotDomain	A list of dimensions for converting pointer location on image to plot coordinates
transCoord	A logical indicating if coodinates from pointer should be transformed based on plotDomain