Build Detector Array on Triangular or Hexagonal Grid
Construct an array of detectors on a triangular grid and optionally select a hexagonal subset of detectors.
make.tri (nx = 10, ny = 12, spacing = 20, detector = "multi",
originxy = c(0,0))
clip.hex (traps, side = 20, centre = c(50, 60*cos(pi/6)),
fuzz = 1e-3, ID = "num", ...)nx |
number of columns of detectors |
ny |
number of rows of detectors |
spacing |
distance between detectors (x and y directions) |
detector |
character value for detector type - "single", "multi" etc. |
originxy |
vector origin for x-y coordinates |
traps |
traps object |
side |
length of hexagon side |
centre |
x-y coordinates of hexagon centre |
fuzz |
floating point fuzz value |
ID |
character string to control row names |
... |
other parameters passed to subset.traps (not used) |
make.tri generates coordinates for nx.ny traps at
separations spacing. The bottom-left (southwest) corner is at
originxy. Identifiers are numeric. See make.grid
for further explanation.
clip.hex clips a grid of detectors, retaining only
those within a bounding hexagon. Detectors are re-labelled according to
ID as follows:
| ID | Effect |
| NULL | no change |
| num | numeric sequence |
| alpha | letter for`shell'; number within shell |
An object of class traps comprising a data frame of x- and
y-coordinates, the detector type ("single", "multi", or "proximity" etc.),
and possibly other attributes.
Several methods are provided for manipulating detector arrays - see traps.
tri.grid <- make.tri(spacing = 10)
plot(tri.grid, border = 5)
hex <- clip.hex(tri.grid, side = 30, ID = "alpha")
plot (hex, add = TRUE, detpar = list(pch = 16, cex = 1.4),
label = TRUE, offset = 2.5 )Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.