diagrams-lib-1.2.0.9: Embedded domain-specific language for declarative graphics

Copyright(c) 2011 diagrams-lib team (see LICENSE)
LicenseBSD-style (see LICENSE)
Maintainerdiagrams-discuss@googlegroups.com
Safe HaskellNone
LanguageHaskell2010

Diagrams.BoundingBox

Contents

Description

Bounding boxes are not very compositional (e.g. it is not possible to do anything sensible with them under rotation), so they are not used in the diagrams core. However, they do have their uses; this module provides definitions and functions for working with them.

Synopsis

Bounding boxes

data BoundingBox v

A bounding box is an axis-aligned region determined by two points indicating its "lower" and "upper" corners. It can also represent an empty bounding box - the points are wrapped in Maybe.

Instances

Constructing bounding boxes

emptyBox :: BoundingBox v

An empty bounding box. This is the same thing as mempty, but it doesn't require the same type constraints that the Monoid

fromCorners :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => Point v -> Point v -> BoundingBox v

Create a bounding box from a point that is component-wise (<=) than the other. If this is not the case, then mempty is returned.

fromPoint :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => Point v -> BoundingBox v

Create a degenerate bounding "box" containing only a single point.

fromPoints :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => [Point v] -> BoundingBox v

Create the smallest bounding box containing all the given points.

boundingBox :: forall a. (Enveloped a, HasBasis (V a), AdditiveGroup (V a), Ord (Basis (V a))) => a -> BoundingBox (V a)

Create a bounding box for any enveloped object (such as a diagram or path).

Queries on bounding boxes

isEmptyBox :: BoundingBox v -> Bool

Queries whether the BoundingBox is empty.

getCorners :: BoundingBox v -> Maybe (Point v, Point v)

Gets the lower and upper corners that define the bounding box.

getAllCorners :: (HasBasis v, AdditiveGroup (Scalar v), Ord (Basis v)) => BoundingBox v -> [Point v]

Computes all of the corners of the bounding box.

boxExtents :: AdditiveGroup v => BoundingBox v -> v

Get the size of the bounding box - the vector from the (component-wise) lesser point to the greater point.

boxTransform :: (AdditiveGroup v, HasLinearMap v, Fractional (Scalar v), AdditiveGroup (Scalar v), Ord (Basis v)) => BoundingBox v -> BoundingBox v -> Maybe (Transformation v)

Create a transformation mapping points from one bounding box to the other.

boxFit :: (Enveloped a, Transformable a, Monoid a, Ord (Basis (V a))) => BoundingBox (V a) -> a -> a

Transforms an enveloped thing to fit within a BoundingBox. If it's empty, then the result is also mempty.

contains :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> Point v -> Bool

Check whether a point is contained in a bounding box (including its edges).

contains' :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> Point v -> Bool

Check whether a point is strictly contained in a bounding box.

inside :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> BoundingBox v -> Bool

Test whether the first bounding box is contained inside the second.

inside' :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> BoundingBox v -> Bool

Test whether the first bounding box is strictly contained inside the second.

outside :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> BoundingBox v -> Bool

Test whether the first bounding box lies outside the second (although they may intersect in their boundaries).

outside' :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> BoundingBox v -> Bool

Test whether the first bounding box lies strictly outside the second (they do not intersect at all).

Operations on bounding boxes

union :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> BoundingBox v -> BoundingBox v

Form the smallest bounding box containing the given two bound union. This function is just an alias for mappend.

intersection :: (HasBasis v, Ord (Basis v), AdditiveGroup (Scalar v), Ord (Scalar v)) => BoundingBox v -> BoundingBox v -> BoundingBox v

Form the largest bounding box contained within this given two bounding boxes, or Nothing if the two bounding boxes do not overlap at all.