isovist {alcyon}

Create isovists at point and direction angle

Description

Create one or more isovists at particular points, given angle and field of view

Usage

isovist(boundaryMap, x, y, angle = NA, viewAngle = NA, verbose = FALSE)

Arguments

boundaryMap

A ShapeMap with lines designating the isovist boundaries

x

X coordinate of the origin points

y

Y coordinate of the origin points

angle

The angle (from the X axis) of the isovist look direction

viewAngle

The angle signifying the isovist's field of view

verbose

Optional. Show more information of the process.

Value

A ShapeMap with the isovist polygons

Examples

mifFile <- system.file(
    "extdata", "testdata", "simple",
    "simple_interior.mif",
    package = "alcyon"
  )
  sfMap <- st_read(mifFile,
    geometry_column = 1L, quiet = TRUE
  )
  shapeMap <- as(sfMap[, vector()], "ShapeMap")
isovist(
  shapeMap,
  x = c(3.01, 1.3),
  y = c(6.70, 5.2),
  angle = 0.01,
  viewAngle = 3.14,
  FALSE
)