144 lines
3.3 KiB
Haskell
144 lines
3.3 KiB
Haskell
{-# OPTIONS_HADDOCK ignore-exports #-}
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module Graphics.Diagram.Types where
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import Algebra.Vector
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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 =
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Diag
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{
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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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| GifDiag
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{
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mkGifDiag :: DiagProp
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-> Colour Double
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-> ([PT] -> [[PT]])
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-> [PT]
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-> [Diagram Cairo R2]
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}
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| EmptyDiag (Diagram Cairo R2)
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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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-- |The path to a quad in the quad tree.
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pQt :: String
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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 = EmptyDiag mempty
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mappend d1@(Diag {}) d2@(Diag {}) = Diag g
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where
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g p obj = mkDiag d1 p obj <> mkDiag d2 p obj
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mappend d1@(GifDiag {}) d2@(Diag {}) = GifDiag g
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where
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g p col f vt = mkGifDiag d1 p col f vt ++ [mkDiag d2 p (Object vt)]
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mappend d1@(Diag {}) d2@(GifDiag {}) = GifDiag g
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where
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g p col f vt = mkDiag d2 p (Object vt) : mkGifDiag d1 p col f vt
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mappend d1@(GifDiag {}) d2@(GifDiag {}) = GifDiag g
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where
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g p col f vt = mkGifDiag d1 p col f vt ++ mkGifDiag d2 p col f vt
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mappend (EmptyDiag _) g = g
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mappend g (EmptyDiag _) = g
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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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filterValidPT :: DiagProp -> [PT] -> [PT]
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filterValidPT p = filter (inRange (dX p, dY p))
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