draw.polygons: Draw polygons on the plot window
In tlocoh.dev: Development package for tlocoh

Description Usage Arguments Details Value

Returns a SpatialPolygonsDataFrame object containing polygons drawn with the mouse on a plot

1 2	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 `draw.reg=FALSE`.
`alpha`	Transparency of the colors (0..1). Ignored if `draw.reg=FALSE`.
`prompt.labels`	Whether to prompt for a label after each polygon is drawn (TRUE/FALSE). See Details.
`ID`	A character vector of length `n` of the ID values for each polygon
`proj4string`	An object of class `CRS` containing the coordinate system of the drawn polygons

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

tlocoh.dev documentation built on May 2, 2019, 5:20 p.m.