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Visibility Graph Analysis

library(alcyon)

galleryMap <- st_read(
    system.file(
        "extdata", "testdata", "gallery",
        "gallery_lines.mif",
        package = "alcyon"
    ),
    geometry_column = 1L, quiet = TRUE
)
pointMap <- makeVGAPointMap(
    galleryMap,
    fillX = 3.01,
    fillY = 6.7,
    gridSize = 0.06
)
plot(pointMap["Connectivity"])

linkedPointMap <- linkCoords(pointMap, 1.74, 6.7, 5.05, 5.24)
vgaMap <- allToAllTraverse(
    pointMap,
    traversalType = TraversalType$Metric,
    radii = -1,
    radiusTraversalType = TraversalType$None
)
plot(vgaMap["Metric Mean Shortest-Path Angle"])

vgaMap <- allToAllTraverse(
    vgaMap,
    traversalType = TraversalType$Angular,
    radii = -1,
    radiusTraversalType = TraversalType$None
)

plot(vgaMap["Angular Mean Depth"])

vgaMap <- allToAllTraverse(
    vgaMap,
    traversalType = TraversalType$Topological,
    radii = -1,
    radiusTraversalType = TraversalType$None
)
plot(vgaMap["Visual Integration [HH]"])

vgaMap <- vgaThroughVision(vgaMap)
plot(vgaMap["Through vision"])

vgaMap <- vgaVisualLocal(vgaMap, FALSE)
plot(vgaMap["Visual Control"])

boundaryMap <- as(galleryMap[, vector()], "ShapeMap")
vgaMap <- vgaIsovist(vgaMap, boundaryMap)
plot(vgaMap["Isovist Area"])

vgaMap <- oneToAllTraverse(
    vgaMap,
    traversalType = TraversalType$Metric,
    fromX = 3.01,
    fromY = 6.7
)
plot(vgaMap["Metric Step Shortest-Path Angle"])

vgaMap <- oneToAllTraverse(
    vgaMap,
    traversalType = TraversalType$Angular,
    fromX = 3.01,
    fromY = 6.7
)
plot(vgaMap["Angular Step Depth"])

vgaMap <- oneToAllTraverse(
    vgaMap,
    traversalType = TraversalType$Topological,
    fromX = 3.01,
    fromY = 6.7
)
plot(vgaMap["Visual Step Depth"])

vgaMap <- oneToOneTraverse(
    vgaMap,
    traversalType = TraversalType$Topological,
    fromX = 4.86,
    fromY = 5.25,
    toX = 1.27,
    toY = 7.60
)
nuv <- length(unique(unlist(vgaMap["Visual Shortest Path"])))
plot(vgaMap["Visual Shortest Path"],
    breaks = "equal",
    nbreaks = nuv,
    col = c("lightgray", depthmap.axmanesque.colour(nuv - 2))
)

vgaMap <- oneToOneTraverse(
    vgaMap,
    traversalType = TraversalType$Topological,
    fromX = 4.86,
    fromY = 5.25,
    toX = 1.27,
    toY = 7.60
)
nuv <- length(unique(unlist(vgaMap["Visual Shortest Path Visual Zone"])))
plot(vgaMap["Visual Shortest Path Visual Zone"],
    breaks = "equal",
    nbreaks = nuv,
    col = c("lightgray", depthmap.axmanesque.colour(nuv - 2))
)

vgaMap <- oneToOneTraverse(
    vgaMap,
    traversalType = TraversalType$Metric,
    fromX = 4.86,
    fromY = 5.25,
    toX = 1.27,
    toY = 7.60
)
nuv <- length(unique(unlist(vgaMap["Metric Shortest Path"])))
plot(vgaMap["Metric Shortest Path"],
    breaks = "equal",
    nbreaks = nuv,
    col = c("lightgray", depthmap.axmanesque.colour(nuv - 2))
)

vgaMap <- oneToOneTraverse(
    vgaMap,
    traversalType = TraversalType$Angular,
    fromX = 4.86,
    fromY = 5.25,
    toX = 1.27,
    toY = 7.60
)
nuv <- length(unique(unlist(vgaMap["Angular Shortest Path"])))
plot(vgaMap["Angular Shortest Path"],
    breaks = "equal",
    nbreaks = nuv,
    col = c("lightgray", depthmap.axmanesque.colour(nuv - 2))
)

vgaMap <- oneToOneTraverse(
    vgaMap,
    traversalType = TraversalType$Angular,
    fromX = 4.86,
    fromY = 5.25,
    toX = 1.27,
    toY = 7.60
)
nuv <- length(unique(unlist(vgaMap["Angular Shortest Path Metric Zone"])))
plot(vgaMap["Angular Shortest Path Metric Zone"],
    breaks = "equal",
    nbreaks = nuv,
    col = c("lightgray", depthmap.classic.colour(nuv - 2))
)

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.