Draw a line or polygon on a plot (map) and save it for later use. After calling the function, start clicking on the map. To finish, right-click and select 'stop'.
drawPoly(sp=TRUE, col='red', lwd=2, ...)
drawLine(sp=TRUE, col='red', lwd=2, ...)logical. If TRUE, the output will be a sp object (SpatialPolygons or SpatialLines). Otherwise a matrix of coordinates is returned
the color of the lines to be drawn
the width of the lines to be drawn
additional arguments padded to locator
If sp==TRUE a SpatialPolygons or SpatialLines object; otherwise a matrix of coordinates