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CGAL 4.8 - 2D and 3D Linear Geometry Kernel

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Kernel::Direction_2 Concept Reference
Kernel Geometric Object Concepts

## Definition

A type representing directions in two dimensions.

Refines:

  CopyConstructible

  Assignable

  DefaultConstructible

See Also
  `CGAL::Direction_2<Kernel>`
  `Kernel::CompareAngleWithXAxis_2`
  `Kernel::ComputeDx_2`
  `Kernel::ComputeDy_2`
  `Kernel::ConstructDirection_2`
  `Kernel::ConstructOppositeDirection_2`
  `Kernel::ConstructPerpendicularDirection_2`
  `Kernel::CounterclockwiseInBetween_2`
  `Kernel::Equal_2`