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

In PredictiveEcology/NetLogoR: Build and Run Spatially Explicit Agent-Based Models

Wrap coordinates or pixels in a torus-like fashion

Description

Generally for model development purposes.

Usage

wrap(obj, bounds, withHeading)

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

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.

Details

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

Value

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

Author(s)

Eliot McIntire

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)
    }
  }
}

PredictiveEcology/NetLogoR documentation built on Jan. 31, 2024, 9:31 p.m.