R: Cut Line Segments Where They Intersect

selfcut.psp {spatstat.geom} | R Documentation

## Cut Line Segments Where They Intersect

### Description

Finds any crossing points between the line segments in a line segment pattern, and cuts the segments into pieces at these crossing-points.

### Usage

    selfcut.psp(A, ..., eps)

### Arguments

`A` | Line segment pattern (object of class `"psp"`).
`eps` | Optional. Smallest permissible length of the resulting line segments. There is a sensible default.
`...` | Ignored.

### Details

This function finds any crossing points between different line segments in the line segment pattern `A`, and cuts the line segments into pieces at these intersection points.

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

### Value

Another line segment pattern (object of class `"psp"`) in the same window as `A` with the same kind of marks as `A`.

The result also has an attribute `"camefrom"` indicating the provenance of each segment in the result. For example `camefrom[3]=2` means that the third segment in the result is a piece of the second segment of `A`.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.

### See Also

`selfcrossing.psp`

### Examples

      X <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
      Y <- selfcut.psp(X)
      n <- nsegments(Y)
      plot(Y %mark% factor(sample(seq_len(n), n, replace=TRUE)))

[Package spatstat.geom version 2.2-0 Index]