draw.polygons {tlocoh.dev} | R Documentation |
Returns a SpatialPolygonsDataFrame object containing polygons drawn with the mouse on a plot
draw.polygons(n, draw.reg = TRUE, col = NULL, alpha = 0.5, prompt.labels = TRUE, ID = NULL, proj4string = CRS(as.character(NA)))
n |
Number of polygons to draw. |
draw.reg |
Whether to draw the polygons on the plot. TRUE/FALSE. |
col |
Color values for the polygons to be drawn. Ignored if |
alpha |
Transparency of the colors (0..1). Ignored if |
prompt.labels |
Whether to prompt for a label after each polygon is drawn (TRUE/FALSE). See Details. |
ID |
A character vector of length |
proj4string |
An object of class |
This function involves 'digitizing' polygons by clicking with the mouse, so it requires a plot window
to be active. The number of polygons to be drawn must be specified by the argument n
. If
prompt.labels=FALSE
, default IDs will be constructed for each polygon.
proj4string
can be used if the current plot window is displaying geographic data.
An object of class SpatialPolygonsDataFrame