Crossing Points of Two Line Segment Patterns

Description

Finds any crossing points between two line segment patterns.

Usage

  crossing.psp(A,B,fatal=TRUE)

Arguments

Details

This function finds any crossing points between the line segment patterns A and B.

A crossing point occurs whenever one of the line segments in A intersects one of the line segments in B, at a nonzero angle of intersection.

If the windows Window(A) and Window(B) do not overlap, then an error will be reported if fatal=TRUE, while if fatal=FALSE an error will not occur and the result will be NULL.

Value

Point pattern (object of class "ppp").

Author(s)

Adrian Baddeley Adrian.Baddeley@uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz

See Also

selfcrossing.psp, psp.object, ppp.object.

Examples

  a <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
  b <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
  plot(a, col="green", main="crossing.psp")
  plot(b, add=TRUE, col="blue")
  P <- crossing.psp(a,b)
  plot(P, add=TRUE, col="red")