# Plot the alpha-shape

### Description

This function returns a plot of the *α*-shape. If desired, it also adds the Delaunay triangulation and Voronoi diagram of the sample.

### Usage

1 2 3 4 |

### Arguments

`x` |
Object of class |

`add` |
Logical, if TRUE add to a current plot. |

`wlines` |
"Which lines?". I.e. should the Delaunay triangulation be plotted (wlines='del'), should the Voronoi diagram be plotted (wlines='vor'), should both be plotted (wlines='both'), or none (wlines='none', the default)? |

`wpoints` |
Logical, indicates if sample points should be plotted. |

`number` |
Logical, defaulting to FALSE; if TRUE then the points plotted will be labelled with their index numbers. |

`col` |
The colour numbers for plotting the |

`xlim` |
The limits on the x-axis. |

`ylim` |
The limits on the y-axis. |

`lwd` |
The line widths for plotting the tesselations and the |

`...` |
Arguments to be passed to methods, such as graphical parameters (see |

### See Also

`ashape`

.

### Examples

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | ```
## Not run:
# Uniform sample of size n=300 in the annulus B(c, 0.5)\B(c, 0.25)
# with c=(0.5, 0.5).
n <- 300
theta<-runif(n,0,2*pi)
r<-sqrt(runif(n,0.25^2,0.5^2))
x<-cbind(0.5+r*cos(theta),0.5+r*sin(theta))
# Value of alpha
alpha <- 0.1
# alpha-shape
ashape.obj <- ashape(x, alpha = alpha)
# Plot alpha-shape in blue, sample points in black,
# and Delaunay triangulation in red
plot(ashape.obj, wlines= "del", col = c(4, 1, 2))
# Random sample from a uniform distribution on a Koch snowflake
# with initial side length 1 and 3 iterations
x <- rkoch(2000, side = 1, niter = 3)
# Value of alpha
alpha <- 0.05
# alpha-shape
ashape.obj <- ashape(x, alpha = alpha)
# Plot alpha-shape in blue
plot(ashape.obj, col = c(4, 1))
## End(Not run)
``` |

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