To turn a graph into a navigation graph you need to add one or
more navigators. Navigator have their own set of states that can be queried
and modified.

l_navigator_add(widget, from = "", to = "", proportion = 0,
color = "orange", ...)

## Arguments

widget |
graph widget |

from |
The position of the navigator on the graph is defined by the
states `from` , `to` and `proportion` . The states `from`
and `to` hold vectors of node names of the graph. The
`proportion` state is a number between and including `0` and
`1` and defines how far the navigator is between the last element of
`from` and the first element of `to` . The `to` state can
also be an empty string `''` if there is no further node to go to.
Hence, the concatenation of `from` and `to` define a path on the
graph. |

to |
see descriptoin above for `from` |

proportion |
see descriptoin above for `from` |

color |
of navigator |

... |
named arguments passed on to modify navigator states |

## Value

navigator handle with navigator id

## Details

For more information run: `l_help("learn_R_display_graph.html#navigators")`

## See also