draw: Draw a polygon, line, extent, or points

In terra: Spatial Data Analysis

Draw a polygon, line, extent, or points

Description

Draw on a plot (map) to get a SpatVector or SpatExtent object for later use. After calling the function, start clicking on the map. When you are done, press ESC. You can also preset the maximum number of clicks.

This does to work well on the default RStudio plotting device. To work around that, you can first run dev.new(noRStudioGD = TRUE) which will create a separate window for plotting, then use plot() followed by click() and click on the map.

Usage

## S4 method for signature 'character'
draw(x="extent", col="red", lwd=2, id=FALSE, n=1000, xpd=TRUE, ...)

Arguments

x	character. The type of object to draw. One of "extent", "polygon", "line", or "points"
col	the color to be used
lwd	the width of the lines to be drawn
id	logical. If TRUE, a numeric ID is shown on the map
n	the maximum number of clicks (does not apply when x=="extent" in which case n is always 2)
xpd	logical. If TRUE, you can draw outside the current plotting area
...	additional graphics arguments for drawing

Value

SpatVector or SpatExtent

See Also

click

terra documentation built on Oct. 14, 2024, 5:07 p.m.