Line between two points — ray • shadow

The function connects two points into a line segment.

ray(from, to)

Arguments

from	A `SpatialPoints*` object specifying origin.
to	A `SpatialPoints*` object specifying destination.

Value

A SpatialLines object.

Examples

ctr = rgeos::gCentroid(build)
angles = seq(0, 359, 20)
sun = mapply(
  shadow:::.sunLocation,
  sun_az = angles,
  MoreArgs = list(
    location = ctr,
    sun_elev = 10)
)
rays = mapply(ray, MoreArgs = list(from = ctr), to = sun)
rays$makeUniqueIDs = TRUE
rays = do.call(rbind, rays)
plot(rays)
sun = do.call(rbind, sun)
text(sun, as.character(angles))