Copyright | (c) 2014 diagrams-lib team (see LICENSE) |
---|---|

License | BSD-style (see LICENSE) |

Maintainer | diagrams-discuss@googlegroups.com |

Safe Haskell | None |

Language | Haskell2010 |

Special functions for points in R2.

## Synopsis

- convexHull2D :: OrderedField n => [P2 n] -> [P2 n]
- sortedConvexHull :: OrderedField n => [P2 n] -> ([P2 n], [P2 n])

# Documentation

convexHull2D :: OrderedField n => [P2 n] -> [P2 n] #

Find the convex hull of a list of points using Andrew's monotone chain algorithm O(n log n).

Returns clockwise list of points starting from the left-most point.

sortedConvexHull :: OrderedField n => [P2 n] -> ([P2 n], [P2 n]) #

Find the convex hull of a set of points already sorted in the x direction. The first list of the tuple is the upper hull going clockwise from left-most to right-most point. The second is the lower hull from right-most to left-most in the anti-clockwise direction.