content: {-# LANGUAGE ConstraintKinds #-}
  {-# LANGUAGE FlexibleContexts #-}
  {-# LANGUAGE TypeFamilies     #-}
  
  -----------------------------------------------------------------------------
  -- |
  -- Module      :  Diagrams.ThreeD.Size
  -- Copyright   :  (c) 2014 diagrams-lib team (see LICENSE)
  -- License     :  BSD-style (see LICENSE)
  -- Maintainer  :  diagrams-discuss@googlegroups.com
  --
  -- Utilities for working with sizes of three-dimensional objects.
  --
  -----------------------------------------------------------------------------
  module Diagrams.ThreeD.Size
         (
           -- ** Computing sizes
           extentX, extentY, extentZ
  
           -- ** Specifying sizes
         , mkSizeSpec3D
         , dims3D
  
         ) where
  
  import           Diagrams.Core
  import           Diagrams.Core.Envelope
  import           Diagrams.Size
  import           Diagrams.TwoD.Size
  import           Diagrams.ThreeD.Types
  import           Diagrams.ThreeD.Vector
  
  ------------------------------------------------------------
  -- Computing diagram sizes
  ------------------------------------------------------------
  
  -- | Compute the absolute z-coordinate range of an enveloped object in
  --   the form @(lo,hi)@. Return @Nothing@ for objects with an empty
  --   envelope.
  extentZ :: (InSpace v n a, R3 v, Enveloped a) => a -> Maybe (n, n)
  extentZ = extent unitZ
  
  -- | Make a 'SizeSpec' from possibly-specified width and height.
  mkSizeSpec3D :: Num n => Maybe n -> Maybe n -> Maybe n -> SizeSpec V3 n
  mkSizeSpec3D x y z = mkSizeSpec (V3 x y z)
  
  -- | Make a 'SizeSpec' from a width and height.
  dims3D :: n -> n -> n -> SizeSpec V3 n
  dims3D x y z = dims (V3 x y z)
  
  