Diagrams.ThreeD.Transform

Transformations specific to three dimensions, with a few generic transformations (uniform scaling, translation) also re-exported for convenience.

Documentation

aboutZ :: Angle a => a -> T3

Create a transformation which rotates by the given angle about a line parallel the Z axis passing through the local origin. A positive angle brings positive x-values towards the positive-y axis.

The angle can be expressed using any type which is an instance of Angle. For example, aboutZ (1/4 :: Turn), aboutZ (tau/4 :: Rad), and aboutZ (90 :: Deg) all represent the same transformation, namely, a counterclockwise rotation by a right angle. For more general rotations, see rotationAbout.

Note that writing aboutZ (1/4), with no type annotation, will yield an error since GHC cannot figure out which sort of angle you want to use.

aboutX :: Angle a => a -> T3

Like aboutZ, but rotates about the X axis, bringing positive y-values towards the positive z-axis.

aboutY :: Angle a => a -> T3

Like aboutZ, but rotates about the Y axis, bringing postive x-values towards the negative z-axis.

rotationAbout

Arguments

:: (Angle a, Direction d)

=> P3

origin of rotation

-> d

direction of rotation axis

-> a

angle of rotation

-> T3

rotationAbout p d a is a rotation about a line parallel to d passing through p.

pointAt :: Direction d => d -> d -> d -> T3

pointAt about initial final produces a rotation which brings the direction initial to point in the direction final by first panning around about, then tilting about the axis perpendicular to initial and final. In particular, if this can be accomplished without tilting, it will be, otherwise if only tilting is necessary, no panning will occur. The tilt will always be between ± /4 turn.

pointAt' :: R3 -> R3 -> R3 -> T3

pointAt' has the same behavior as pointAt, but takes vectors instead of directions.

scalingX :: Double -> T3

Construct a transformation which scales by the given factor in the x direction.

scaleX :: (Transformable t, V t ~ R3) => Double -> t -> t

Scale a diagram by the given factor in the x (horizontal) direction. To scale uniformly, use scale.

scalingY :: Double -> T3

Construct a transformation which scales by the given factor in the y direction.

scaleY :: (Transformable t, V t ~ R3) => Double -> t -> t

Scale a diagram by the given factor in the y (vertical) direction. To scale uniformly, use scale.

scalingZ :: Double -> T3

Construct a transformation which scales by the given factor in the z direction.

scaleZ :: (Transformable t, V t ~ R3) => Double -> t -> t

Scale a diagram by the given factor in the z direction. To scale uniformly, use scale.

onBasis :: T3 -> ((R3, R3, R3), R3)

Get the matrix equivalent of an affine transform, as a triple of columns paired with the translation vector. This is mostly useful for implementing backends.