Data.Geometry.Ipe.FromIpe

Functions that help reading geometric values from ipe images.

Documentation

>>> :set -XOverloadedStrings
>>> import Data.Geometry.Ipe.Attributes
>>> import Data.Geometry.Ipe.Color(IpeColor(..))
>>> import Data.Geometry.Point
>>> :{
let testPath :: Path Int
    testPath = Path . fromSingleton  . PolyLineSegment
             . PolyLine.fromPoints . map ext
             $ [ origin, point2 10 10, point2 200 100 ]
    testPathAttrs :: IpeAttributes Path Int
    testPathAttrs = attr SStroke (IpeColor "red")
    testObject :: IpeObject Int
    testObject = IpePath (testPath :+ testPathAttrs)
:}

_asLineSegment :: Prism' (Path r) (LineSegment 2 () r)

Try to convert a path into a line segment, fails if the path is not a line segment or a polyline with more than two points.

_asPolyLine :: Prism' (Path r) (PolyLine 2 () r)

Convert to a polyline. Ignores all non-polyline parts

>>> testPath ^? _asPolyLine
Just (PolyLine {_points = LSeq (fromList [Point2 [0,0] :+ (),Point2 [10,10] :+ (),Point2 [200,100] :+ ()])})

_asSimplePolygon :: Prism' (Path r) (Polygon Simple () r)

Convert to a simple polygon

_asTriangle :: Prism' (Path r) (Triangle 2 () r)

Convert to a triangle

_asMultiPolygon :: Prism' (Path r) (MultiPolygon () r)

Convert to a multipolygon

polygonToPath :: Polygon t () r -> Path r

pathToPolygon :: Path r -> Maybe (Either (SimplePolygon () r) (MultiPolygon () r))

_withAttrs :: Prism' (IpeObject r) (i r :+ IpeAttributes i r) -> Prism' (i r) g -> Prism' (IpeObject r) (g :+ IpeAttributes i r)

Use the first prism to select the ipe object to depicle with, and the second how to select the geometry object from there on. Then we can select the geometry object, directly with its attributes here.

>>> testObject ^? _withAttrs _IpePath _asPolyLine
Just (PolyLine {_points = LSeq (fromList [Point2 [0,0] :+ (),Point2 [10,10] :+ (),Point2 [200,100] :+ ()])} :+ Attrs {NoAttr, NoAttr, NoAttr, NoAttr, Attr IpeColor (Named "red"), NoAttr, NoAttr, NoAttr, NoAttr, NoAttr, NoAttr, NoAttr, NoAttr, NoAttr, NoAttr, NoAttr})

class HasDefaultFromIpe g where

Associated Types

type DefaultFromIpe g :: * -> *

Methods

defaultFromIpe :: r ~ NumType g => Prism' (IpeObject r) (g :+ IpeAttributes (DefaultFromIpe g) r)

Instances

HasDefaultFromIpe (MultiPolygon () r)

Defined in Data.Geometry.Ipe.FromIpe

Associated Types

type DefaultFromIpe (MultiPolygon () r) :: Type -> Type

Methods

defaultFromIpe :: r0 ~ NumType (MultiPolygon () r) => Prism' (IpeObject r0) (MultiPolygon () r :+ IpeAttributes (DefaultFromIpe (MultiPolygon () r)) r0)

HasDefaultFromIpe (SimplePolygon () r)

Defined in Data.Geometry.Ipe.FromIpe

Associated Types

type DefaultFromIpe (SimplePolygon () r) :: Type -> Type

Methods

defaultFromIpe :: r0 ~ NumType (SimplePolygon () r) => Prism' (IpeObject r0) (SimplePolygon () r :+ IpeAttributes (DefaultFromIpe (SimplePolygon () r)) r0)

HasDefaultFromIpe (LineSegment 2 () r)

Defined in Data.Geometry.Ipe.FromIpe

Associated Types

type DefaultFromIpe (LineSegment 2 () r) :: Type -> Type

Methods

defaultFromIpe :: r0 ~ NumType (LineSegment 2 () r) => Prism' (IpeObject r0) (LineSegment 2 () r :+ IpeAttributes (DefaultFromIpe (LineSegment 2 () r)) r0)

HasDefaultFromIpe (PolyLine 2 () r)

Defined in Data.Geometry.Ipe.FromIpe

Associated Types

type DefaultFromIpe (PolyLine 2 () r) :: Type -> Type

Methods

defaultFromIpe :: r0 ~ NumType (PolyLine 2 () r) => Prism' (IpeObject r0) (PolyLine 2 () r :+ IpeAttributes (DefaultFromIpe (PolyLine 2 () r)) r0)

readAll :: (HasDefaultFromIpe g, r ~ NumType g, Foldable f) => f (IpePage r) -> [g :+ IpeAttributes (DefaultFromIpe g) r]

Read all g's from some ipe page(s).

readAllFrom :: (HasDefaultFromIpe g, r ~ NumType g, Coordinate r, Eq r) => FilePath -> IO [g :+ IpeAttributes (DefaultFromIpe g) r]

Convenience function from reading all g's from an ipe file. If there is an error reading or parsing the file the error is "thrown away".

fromSingleton :: a -> LSeq 1 a