# is.convex

From spatstat v1.17-0
by Adrian Baddeley

##### Test Whether a Window is Convex

Determines whether a window is convex.

##### Usage

`is.convex(x)`

##### Arguments

- x
- Window (object of class
`"owin"`

).

##### Details

If `x`

is a rectangle, the result is TRUE.

If `x`

is polygonal, the result is TRUE if `x`

consists of a
single polygon and this polygon is equal to the minimal convex hull
of its vertices computed by `chull`

.

If `x`

is a mask, the algorithm first extracts all boundary
pixels of `x`

using `vertices`

. Then it computes
the (polygonal) convex hull $K$ of the boundary pixels.
The result is TRUE if every boundary pixel lies within
one pixel diameter of an edge of $K$.

##### Value

- Logical value, equal to
`TRUE`

if`x`

is convex.

##### See Also

*Documentation reproduced from package spatstat, version 1.17-0, License: GPL (>= 2)*

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