114 lines
2.5 KiB
Haskell
114 lines
2.5 KiB
Haskell
{-# OPTIONS_HADDOCK ignore-exports #-}
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module Graphics.Diagram.Types where
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import Algebra.VectorTypes
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import Diagrams.Backend.Cairo
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import Diagrams.Prelude
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import MyPrelude
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type MeshString = String
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-- |Represents a Cairo Diagram. This allows us to create multiple
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-- diagrams with different algorithms but based on the same
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-- coordinates and common properties.
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data Diag = Diag {
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mkDiag :: DiagProp
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-> Object
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-> Diagram Cairo R2
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}
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data Object = Object [PT]
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| Objects [[PT]]
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-- |Holds the properties for a Diagram, like thickness of 2d points etc.
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-- This can also be seen as a context when merging multiple diagrams.
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data DiagProp = MkProp {
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-- |The thickness of the dots.
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t :: Double,
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-- |The dimensions of the x-axis.
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dX :: Coord,
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-- |The dimensions of the y-axis.
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dY :: Coord,
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-- |Algorithm to use.
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alg :: Int,
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-- |If we want to show the grid.
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gd :: Bool,
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-- |If we want to show the coordinates as text.
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ct :: Bool,
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-- |Square size used to show the grid and x/y-axis.
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sqS :: Double
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}
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instance Def DiagProp where
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def = defaultProp
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instance Monoid Diag where
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mempty = Diag (\_ _ -> mempty)
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mappend d1 d2 = Diag g
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where
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g p vt = mkDiag d1 p vt <> mkDiag d2 p vt
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mconcat = foldr mappend mempty
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-- |The default properties of the Diagram.
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defaultProp :: DiagProp
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defaultProp = MkProp 2 (0,500) (0,500) 0 False False 50
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-- |Extract the lower bound of the x-axis dimension.
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xmin :: DiagProp -> Double
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xmin = fst . dX
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-- |Extract the upper bound of the x-axis dimension.
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xmax :: DiagProp -> Double
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xmax = snd . dX
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-- |Extract the lower bound of the y-axis dimension.
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ymin :: DiagProp -> Double
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ymin = fst . dY
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-- |Extract the upper bound of the y-axis dimension.
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ymax :: DiagProp -> Double
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ymax = snd . dY
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-- |The full width of the x dimension.
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w' :: DiagProp -> Double
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w' p = xmax p - xmin p
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-- |The full height of the y dimension.
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h' :: DiagProp -> Double
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h' p = ymax p - ymin p
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-- |The offset on the x-axis to move the grid and the white rectangle
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-- to the right place.
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wOff :: DiagProp -> Double
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wOff p = xmin p + (w' p / 2)
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-- |The offset on the y-axis to move the grid and the white rectangle
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-- to the right place.
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hOff :: DiagProp -> Double
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hOff p = ymin p + (h' p / 2)
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-- |Returns the specified diagram if True is passed,
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-- otherwise returns the empty diagram. This is just for convenience
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-- to avoid if else constructs.
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maybeDiag :: Bool -> Diag -> Diag
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maybeDiag b d
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| b = d
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| otherwise = mempty
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