# alphahull v2.2

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## Generalization of the Convex Hull of a Sample of Points in the Plane

Computation of the alpha-shape and alpha-convex
hull of a given sample of points in the plane. The concepts of
alpha-shape and alpha-convex hull generalize the definition of
the convex hull of a finite set of points. The programming is
based on the duality between the Voronoi diagram and Delaunay
triangulation. The package also includes a function that
returns the Delaunay mesh of a given sample of points and its
dual Voronoi diagram in one single object.

## Functions in alphahull

Name | Description | |

dw_track | RBM-sausage calculation of tracking data | |

rotation | Clockwise rotation | |

plot.ahull | Plot the alpha-convex hull | |

rkoch | Random generation on a Koch snowflake curve | |

lengthahull | Length of the boundary of the alpha-convex hull | |

dw | Devroye-Wise estimator | |

ashape | alpha-shape calculation | |

dummycoor | Semi-infinite edge of the Voronoi diagram | |

inahull | Determines for one or more points whether they belong to the alpha-convex hull | |

plot.delvor | Plot the Voronoi diagram and Delaunay traingulation | |

plot.ashape | Plot the alpha-shape | |

tricircum | Returns the circumcentres of a Delaunay triangulation | |

koch | Construct a Kock snowflake curve | |

inter | Intersection of two circumferences | |

areaahull | Area of the alpha-convex hull | |

anglesArc | Angles of the extremes of an arc | |

delvor | Delaunay triangulation and Voronoi diagram | |

ahull_track | alpha-convex hull calculation of tracking data | |

arc | Add an arc to a plot | |

complement | Complement of the alpha-convex hull | |

alphahull-package | Generalization of the Convex Hull of a Sample of Points in the Plane | |

ahull | alpha-convex hull calculation | |

areaahulleval | Area of the alpha-convex hull | |

No Results! |

## Vignettes of alphahull

Name | ||

alphahull.rnw | ||

biblioJSS.bib | ||

No Results! |

## Last month downloads

## Details

Date | 2019-06-19 |

License | file LICENSE |

NeedsCompilation | yes |

License_restricts_use | yes |

Packaged | 2019-06-19 13:07:31 UTC; beatriz |

Repository | CRAN |

Date/Publication | 2019-06-21 17:30:03 UTC |

imports | ggplot2 , R.utils , sgeostat , spatstat , splancs , tripack |

Contributors | Beatriz Pateiro-Lopez, Alberto Rodriguez-Casal |

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