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#' @title Modify States of a Plot that are Linked in Loon's Standard Linking
#' Model
#'
#' @description Loon's standard linking model is based on three levels, the
#' \code{linkingGroup} and \code{linkingKey} states and the \emph{used
#' linkable states}. See the details below.
#'
#' @template param_widget
#' @param states used linkable state names, see in details below
#'
#' @details Loon's standard linking model is based on two states,
#' \code{linkingGroup} and \code{linkingKey}. The full capabilities of the
#' standard linking model are described here. However, setting the
#' \code{linkingGroup} states for two or more displays to the same string is
#' generally all that is needed for linking displays that plot data from the
#' same data frame. Changing the linking group of a display is also the only
#' linking-related action available on the analysis inspectors.
#'
#' The first linking level is as follows: loon's displays are linked if they
#' share the same string in their \code{linkingGroup} state. The default
#' linking group \code{'none'} is a keyword and leaves a display un-linked.
#'
#' The second linking level is as follows. All \code{n}-dimensional states can
#' be linked between displays. We call these states \emph{linkable}. Further,
#' only linkable states with the same name can be linked between displays. One
#' consequence of this \emph{shared state name} rule is that, with the
#' standard linking model, the \code{linewidth} state of a serialaxes display
#' cannot be linked with the \code{size} state of a scatterplot display. Also,
#' each display maintains a list that defines which of its linkable states
#' should be used for linking; we call these states the \emph{used linkable}
#' states. The default used linkable states are as follows
#'
#' \tabular{ll}{
#'
#' Display \tab Default \emph{used linkable} states\cr
#'
#' scatterplot \tab \code{selected}, \code{color}, \code{active},
#' \code{size}\cr histogram \tab \code{selected}, \code{color},
#' \code{active}\cr
#'
#' serialaxes \tab \code{selected}, \code{color}, \code{active}\cr
#'
#' graph \tab \code{selected}, \code{color}, \code{active}, \code{size}
#'
#' }
#'
#' If any two displays are set to be linked (i.e. they share the same linking
#' group) then the intersection of their \emph{used linkable} states are
#' actually linked.
#'
#' The third linking level is as follows. Every display has a
#' \code{n}-dimensional \code{linkingKey} state. Hence, every data point has
#' an associated linking key. Data points between linked plots are linked if
#' they share the same linking key.
#'
#' @export
l_setLinkedStates <- function(widget, states) {
invisible(as.character(tcl(widget, 'setLinkedStates', states)))
}
#' @title Query the States that are Linked with Loon's Standard Linking Model
#'
#' @description Loon's standard linking model is based on three levels, the
#' \code{linkingGroup} and \code{linkingKey} states and the \emph{used
#' linkable states}. See the details in the documentation for
#' \code{\link{l_setLinkedStates}}.
#'
#' @template param_widget
#'
#' @return vector with state names that are linked states
#'
#' @seealso \code{\link{l_setLinkedStates}}
#'
#' @export
l_getLinkedStates <- function(widget) {
as.character(tcl(widget, 'getLinkedStates'))
}
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