If this db-class structure is provided, the information of closest sample is printed out

Gives the rank of the coordinate used on the abscissae axis.

Gives the rank of the coordinate used on the ordinate axis.

Vector (of space dimension) which gives the indices of the reference corner point. The extracted plane contains the reference corner point.

When TRUE, this function performs a loop for digitizing several points. The different buttons of the mouse allow interrupting the digitization loops.

When TRUE and if a projection is active, the digitized polygon is not converted back to the original reference system: it is kept in the projected system.

Argument passed to locator.