Difference between revisions of "Diagrams"
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* animations/pages/frames |
* animations/pages/frames |
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| − | === Data structures === |
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| − | <haskell> |
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| − | data Figure = Figure { |
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| − | fill :: Fill |
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| − | , shape :: Shape |
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| − | , stroke :: Stroke |
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| − | } |
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| − | |||
| − | data Fill = Fill { |
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| − | fillPaint :: Paint, |
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| − | } |
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| − | |||
| − | data Stroke = Stroke { |
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| − | strokePaint :: Paint, |
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| − | , lineWidth :: Double, |
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| − | , dashPattern :: DashPattern |
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| − | , lineCap :: LineCap |
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| − | , lineJoin :: LineJoin |
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| − | , miterLimit :: Double |
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| − | } deriving(Eq, Show) |
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| − | |||
| − | data Paint = |
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| − | SolidColor |
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| − | | Pattern |
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| − | | Gradient |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data LineCap = |
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| − | LineCapButt |
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| − | | LineCapRound |
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| − | | LineCapSquare |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data LineJoin = |
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| − | LineJoinMiter |
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| − | | LineJoinRound |
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| − | | LineJoinBevel |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data Shape = |
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| − | Path |
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| − | | Primitive |
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| − | | Text |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data Path = Path { |
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| − | segments :: [Segment] |
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| − | } |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data Segment = |
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| − | Move Point |
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| − | | Line { |
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| − | a :: Point |
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| − | , b :: Point |
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| − | } |
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| − | | HorizontalLine { |
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| − | a :: Point |
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| − | , w :: Double |
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| − | } |
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| − | | VerticalLine { |
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| − | a :: Point |
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| − | , h :: Double |
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| − | } |
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| − | | QuadraticBezier Point Point Point |
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| − | | CubicBezier Point Point Point Point |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data Point = |
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| − | Node2d Double Double |
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| − | | Node3d Double Double Double |
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| − | deriving(Eq, Show) |
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| − | |||
| − | data Primitive = |
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| − | Circle |
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| − | | Ellipse |
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| − | | Rectangle |
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| − | | RegularPolygon |
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| − | | Square |
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| − | | Star |
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| − | deriving(Eq, Show) |
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| − | |||
| − | class PathLike a = |
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| − | convertToPath :: a -> Path |
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| − | </haskell> |
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Revision as of 08:50, 7 December 2009
The diagrams library provides an embedded domain-specific language (EDSL) for creating simple pictures and diagrams in Haskell
Rewrite
Core DSL
Style
Do we either want
yellowCircle x y radius = yellowFill $ circleShape x y radius
or
drawYellowCircle x y radius = do $
setFill yellow
drawCircle x y radius
?
The first version allows better reuse and functional composition.
Elements
- graphical primitives
- path
- boundingBox
- moveTo, lineTo, cubic bezier, quadratic bezier, arcTo
- text
- boundingBox
- convertToPath
- circle
- boundingBox
- convertToPath
- ellipse
- boundingBox
- convertToPath
- rectangle
- boundingBox
- convertToPath
- polygon
- boundingBox
- convertToPath
- polyline
- boundingBox
- convertToPath
- path
- graphical attributes
- fill
- paint
- solid color, gradient, pattern
- fill rule
- evenOdd, nonZero
- paint
- stroke
- paint
- solid color, gradient, pattern
- width
- line cap
- line join
- miter limit
- dash
- offset
- array
- paint
- marker symbols
- effects
- shadow, blur, turbulence
- fill
- constraint solving
- animations/pages/frames
Modules/Extensions
Paths
- inset, outset
- boolean operations
- morphing
- approximation (autotrace)
See
- http://lib2geom.sourceforge.net/
- http://inkscape.svn.sourceforge.net/viewvc/inkscape/inkscape/trunk/src/live_effects/
Shapes and symbols
- stars, supershape, symbols
- diagrams
- histograms, density plots
Input/Output
Many Haskell graphic libraries are tied to a specific rendering backend (Cairo, OpenGL, libGD etc) which makes collaboration and reuse of code and data structures very hard or impossible.
Also some dependencies are hard to fulfill. Cairo is very difficult to install on Mac OS 10.6. If you just need to generate PDF diagrams, you could choose the pure HPDF library where e.g. Hieroglyph can not be installed because of its Cairo dependence.
Output
- interactive drawing via Cairo
- PDF export via pure HPDF
- EPS export
- SWF export
- LaTeX export
- exotic backends
- generate Java2d or Processing source code
Input
- pure Haskell PNG import via pngload
- pure Haskell SVG import