diagrams-lib-0.3: Embedded domain-specific language for declarative graphics

Diagrams.TwoD.Util

Description

Utility functions for diagrams in two-dimensional Cartesian space.

Synopsis

General two-dimensional utilities

The unit vector in the positive X direction.

The unit vector in the positive Y direction.

The unit vector in the negative X direction.

The unit vector in the negative Y direction.

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.

Size and extent of diagrams in R2

Computing sizes

width :: (Boundable a, V a ~ R2) => a -> DoubleSource

Compute the width of a diagram.

height :: (Boundable a, V a ~ R2) => a -> DoubleSource

Compute the height of a diagram.

size2D :: (Boundable a, V a ~ R2) => a -> (Double, Double)Source

Compute the width and height of a diagram.

extentX :: (Boundable a, V a ~ R2) => a -> (Double, Double)Source

Compute the absolute x-coordinate range of a diagram in R2, in the form (lo,hi).

extentY :: (Boundable a, V a ~ R2) => a -> (Double, Double)Source

Compute the absolute y-coordinate range of a diagram in R2, in the form (lo,hi).

center2D :: (Boundable a, V a ~ R2) => a -> P2Source

Compute the point at the center (in the x- and y-directions) of a diagram.

Specifying sizes

data SizeSpec2D Source

A specification of a (requested) rectangular size.

Constructors

 Width Double Specify an explicit width. The height should be determined automatically (so as to preserve aspect ratio). Height Double Specify an explicit height. The width should be determined automatically (so as to preserve aspect ratio) Dims Double Double An explicit specification of both dimensions. Absolute Absolute size: use whatever size an object already has; do not rescale.