This is a helper function that creates a sequence of points on a circle of
radius `r`

as a resolution determined by `n`

. It is not intended
for direct calling, and is used by the ellipse plotting function
`addEllipse`

. NB not an exported function.

1 | ```
genCircle(n = 100, r)
``` |

`n` |
the number of points to create around the circle. Defaults to 100. |

`r` |
the radius of the circle to create. |

A 2 x n matrix of x and y coordinates of points on a circle.

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