# simplify.owin

From spatstat v1.21-0
by Adrian Baddeley

##### Approximate a Polygon by a Simpler Polygon

Given a polygonal window, this function finds a simpler polygon that approximates it.

##### Usage

`simplify.owin(W, dmin)`

##### Arguments

- W
- The polygon which is to be simplied.
An object of class
`"owin"`

. - dmin
- Numeric value. The smallest permissible length of an edge.

##### Details

This function simplifies a polygon `W`

by recursively deleting the shortest edge of `W`

until all remaining edges are longer than the specified
minimum length `dmin`

, or until there are only three edges left.

The argument `W`

must be a window (object of class
`"owin"`

). It should be of type `"polygonal"`

.
If `W`

is a rectangle, it is returned without alteration.

The simplification algorithm is not yet implemented for
binary masks. If `W`

is a mask, an error is generated.

##### Value

- Another window (object of class
`"owin"`

) of type`"polygonal"`

.

##### See Also

##### Examples

```
data(letterR)
plot(letterR, col="red")
plot(simplify.owin(letterR, 0.3), col="blue", add=TRUE)
data(chorley)
W <- chorley$window
plot(W)
WS <- simplify.owin(W, 2)
plot(WS, add=TRUE, border="green")
points(vertices(WS))
```

*Documentation reproduced from package spatstat, version 1.21-0, License: GPL (>= 2)*

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