Spherical Projection of Cones

Visualization of small-circles and great-circles in a stereographic or equal-area projection.

Usage

stereo_smallcircle(
  x,
  d = 90,
  col = par("col"),
  N = 1000,
  upper.hem = NULL,
  earea = NULL,
  lty = par("lty"),
  lwd = par("lwd"),
  fill = FALSE,
  border = NA,
  radius = NULL,
  ...
)

stereo_greatcircle(x, ...)

Arguments

x

object of class "Vec3", "Line", "Ray", "Plane", "Pair", or "Fault", where the rows are the observations and the columns are the coordinates.

d

numeric. conical angle in degrees.

col, lty, lwd

color, line type, and line width parameters

N

integer. number of points to calculate

upper.hem

logical. Whether the projection is shown for upper hemisphere (TRUE) or lower hemisphere (FALSE). Defaults to getOption("structr.upper.hem").

earea

logical. Projection, either TRUE for Lambert equal-area projection, or FALSE for meridional stereographic projection. Defaults to getOption("structr.earea").

fill

logical. Whether to fill the inner part of the small-circle? FALSE by default.

border

Color of the filled small-circle's outline (ignored if fill=FALSE)

radius

numeric. Radius of circle. Defaults to getOption("structr.radius").

...

optional graphical parameters passed to graphics::lines() and (if fill=TRUE) graphics::polygon()

See also

lines.spherical(), stereo_segment(), stereo_lines()

Other stereo-plot: arrows(), fault-plot, lines(), plot-spherical, points.spherical(), stereo_confidence(), stereo_contour, stereo_lines(), stereo_point(), stereo_segment(), stereoplot(), stereoplot_guides(), stereoplot_ticks(), text.spherical()

Examples

stereoplot()
stereo_point(Line(90, 5), lab = "L")
stereo_smallcircle(Line(90, 5), d = 10)
stereo_point(Plane(120, 30), lab = "P", col = "red")
stereo_greatcircle(Plane(120, 30), col = "red")


stereoplot()
stereo_point(Line(c(129, 90), c(30, 5)), lab = c("L1", "L2"))
stereo_smallcircle(Line(c(129, 90), c(30, 5)), d = c(10, 5), 
  col = 1:2, lty = 1:2, lwd = 1:2)

#> [[1]]
#> NULL
#> 
#> [[2]]
#> NULL
#> 

# Filled cones:
stereoplot()
stereo_smallcircle(Line(c(90, 120), c(5, 5)), d = c(5, 20), 
  col = c('grey60', 'grey40'), border = c('red', 'blue'), fill = TRUE)
stereo_point(Line(c(90, 120), c(5, 5)), col = c('red', 'blue'))