150 lines
3.8 KiB
Haskell
150 lines
3.8 KiB
Haskell
module Diagram (t,
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dX,
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dY,
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alg,
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defaultProp,
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diag,
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diagS,
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whiteRect) where
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import Defaults
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import Diagrams.Prelude
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import Diagrams.Backend.Cairo
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import Meshparser
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import Util
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-- |Represents a Cairo Diagram. This allow 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 -- ^ properties of the diagrams
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-> VTable -- ^ coordinates from the vertice table
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-> Diagram Cairo R2 -- ^ resulting cairo 2d diagram
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}
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-- |Holds the properties for a Diagram, like thickness of 2d points etc.
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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 :: (Double, Double),
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-- |The dimensions of the y-axis.
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dY :: (Double, Double),
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-- |Algorithm to use.
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alg :: Int
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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 (\_ _ -> rect 0 0 # lwG 0.00)
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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 `atop` 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
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-- |Extract the lower bound of the x-axis dimension.
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xlD :: DiagProp -> Double
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xlD = fst . dX
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-- |Extract the upper bound of the x-axis dimension.
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xuD :: DiagProp -> Double
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xuD = snd . dX
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-- |Extract the lower bound of the y-axis dimension.
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ylD :: DiagProp -> Double
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ylD = fst . dY
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-- |Extract the upper bound of the y-axis dimension.
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yuD :: DiagProp -> Double
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yuD = snd . dY
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-- |The X offset to move coordinates to the right
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-- position depending on the X dimensions.
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xOffset :: DiagProp -> Double
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xOffset p = (negate (xlD p) / 2) - (xuD p / 2)
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-- |The Y offset to move coordinates to the right
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-- position depending on the X dimensions.
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yOffset :: DiagProp -> Double
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yOffset p = (negate (ylD p) / 2) - (yuD p / 2)
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-- |Creates a Diagram that shows the coordinates from the VTable
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-- as dots. The VTable and thickness of the dots can be controlled
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-- via DiagProp.
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showCoordinates :: Diag
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showCoordinates = Diag f
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where
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f p vt
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= position (zip (map mkPoint . filter (inRange (dX p) (dY p)) $ vt)
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(repeat dot)) # moveTo (p2(xOffset p, yOffset p))
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where
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-- a dot itself is a diagram
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dot = (circle $ t p :: Diagram Cairo R2) # fc black
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-- this is just abstraction
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mkPoint (x,y) = p2 (x,y)
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-- |Creates a Diagram that shows an XAxis which is bound
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-- by the dimensions given in xD from DiagProp.
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showXAxis :: Diag
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showXAxis = Diag f
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where
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f p _ = hrule (xuD p - xlD p) # moveTo (p2(0, yOffset p))
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-- |Creates a Diagram that shows an YAxis which is bound
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-- by the dimensions given in yD from DiagProp.
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showYAxis :: Diag
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showYAxis = Diag f
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where
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f p _ = vrule (yuD p - ylD p) # moveTo (p2(xOffset p, 0))
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-- |Creates a Diagram that shows a white rectangle which is a little
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-- bit bigger as both X and Y axis dimensions from DiagProp.
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showWhiteRectB :: Diag
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showWhiteRectB = Diag f
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where
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f p _ = whiteRect (xuD p - xlD p + 50) (yuD p - ylD p + 50)
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-- |Create the Diagram from the VTable.
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diag :: DiagProp -> VTable -> Diagram Cairo R2
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diag p = case alg p of
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0 -> mkDiag
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(mconcat [showCoordinates, showXAxis, showYAxis, showWhiteRectB])
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p
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_ -> mempty
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-- |Create the Diagram from a String which is supposed to be the contents
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-- of an obj file.
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diagS :: DiagProp -> String -> Diagram Cairo R2
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diagS p mesh
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= diag p .
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meshToArr $
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mesh
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-- |Create a white rectangle with the given width and height.
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whiteRect :: Double -> Double -> Diagram Cairo R2
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whiteRect x y = rect x y # lwG 0.00 # bg white
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