Maintainer | diagrams-discuss@googlegroups.com |
---|---|
Safe Haskell | None |
Two-dimensional vectors.
Special 2D vectors
Converting between vectors and angles
direction :: R2 -> AngleSource
Compute the direction of a vector, measured counterclockwise from the positive x-axis as a fraction of a full turn. The zero vector is arbitrarily assigned the direction 0.
angleBetween :: (InnerSpace v, Scalar v ~ Double) => v -> v -> AngleSource
compute the positive angle between the two vectors in their common plane
fromDirection :: Angle -> R2Source
Convert an angle into a unit vector pointing in that direction.
A convenient synonym for fromDirection
.
2D vector utilities
perp v
is perpendicular to and has the same magnitude as v
.
In particular perp v == rotateBy (1/4) v
.