NetLogoR (version 1.0.5)

wrap: Wrap coordinates or pixels in a torus-like fashion

Description

Generally for model development purposes.

Usage

wrap(obj, bounds, withHeading)
# S4 method for ANY
wrap(obj, bounds, withHeading)

Value

Same class as obj, but with coordinates updated to reflect the wrapping.

Arguments

obj

A SpatialPoints* object, or matrix of coordinates.

bounds

Either a Raster*, Extent, or bbox object defining bounds to wrap around.

withHeading

Logical. If TRUE, then the previous points must be wrapped also so that the subsequent heading calculation will work. Default FALSE. See details.

Author

Eliot McIntire

Details

If withHeading used, then obj must be a SpatialPointsDataFrame that contains two columns, x1 and y1, with the immediately previous agent locations.

Examples

if (requireNamespace("terra")) {
  xrange <- yrange <- c(-50, 50)
  hab <- terra::rast(terra::ext(c(xrange, yrange)))
  hab[] <- runif(terra::ncell(hab))

  # initialize agents
  N <- 10

  # previous points
  x1 <- rep(0, N)
  y1 <- rep(0, N)
  # initial points
  starts <- cbind(
    x = stats::runif(N, xrange[1], xrange[2]),
    y = stats::runif(N, yrange[1], yrange[2])
  )

  # create the agent object
  agent <- agentMatrix(coords = starts, data = data.frame(x1 = x1, y1 = y1))

  ln <- rlnorm(N, 1, 0.02) # log normal step length
  sd <- 30 # could be specified globally in params

  if (interactive()) {
    library(quickPlot)
    clearPlot()
    Plot(hab, zero.color = "white", axes = "L")
    Plot(agent, addTo = "hab")
  }
  if (requireNamespace("SpaDES.tools") &&
    requireNamespace("CircStats")) {
    for (i in 1:10) {
      agent <- SpaDES.tools::crw(
        agent = agent,
        extent = terra::ext(hab), stepLength = ln,
        stddev = sd, lonlat = FALSE, torus = TRUE
      )
      if (interactive()) Plot(agent, addTo = "hab", axes = TRUE)
    }
  }
}