module P2: sig .. end

type t = Gg.p2 

The type for points.

val dim : int

dim is the dimension of points of type Gg.p2.

type mh = Gg.m3 

The type for matrices representing linear transformations of homogenous 2D space.

val v : float -> float -> Gg.p2

v x y is the point (x y).

val x : Gg.p2 -> float

x p is the x coordinate of p.

val y : Gg.p2 -> float

y p is the y coordinate of p.

val o : Gg.p2

o is the point (0 0).

val mid : Gg.p2 -> Gg.p2 -> Gg.p2

mid p q is the mid point (p + q)/2.

val tr : Gg.m3 -> Gg.p2 -> Gg.p2

tr m p is the affine transform in homogenous 2D space of the point p by m.

Note. Since m is supposed to be affine the function ignores the last row of m. p is treated as a finite point (its last coordinate in homogenous space is 1). Use Gg.V2.tr to transform vectors (infinite points).