Graphics.Rendering.Chart.SparkLine

Created : 2008-02-26 Modified : 2011-02-11 Version : 0.2

Sparklines implementation in Haskell. Sparklines are mini graphs inspired by Edward Tufte.

The original implementation (by Hitesh Jasani) used the gd package as a backend renderer, and is still available at http:hackage.haskell.orgpackagehsparklines The present version uses Cairo as its renderer, and integrates with the Chart package, in the sense that Sparklines are just another kind of (ToRenderable a => a), so can be composed into grids etc.

 dp :: [Double]
 dp = [24,21,32.3,24,15,34,43,55,57,72,74,75,73,72,55,44]

 sparkLineToPNG "bar_spark.png" (SparkLine barSpark dp)

SparkLine type

data SparkLine

A sparkline is a single sequence of data values, treated as y-values. The x-values are anonymous and implicit in the sequence.

Constructors

SparkLine

Fields

sl_options :: SparkOptions

sl_data :: [Double]

Instances

ToRenderable SparkLine

Drawing options

data SparkOptions

Options to render the sparklines in different ways.

Constructors

SparkOptions

Fields

so_smooth :: Bool

smooth or bars

so_step :: Int

step size

so_height :: Int

graph height (pixels)

so_limits :: (Double, Double)

data point limits

so_bgColor :: Colour Double

background color

so_minColor :: Colour Double

color of minimum datapoint

so_maxColor :: Colour Double

color of maximum datapoint

so_lastColor :: Colour Double

color of last datapoint

so_minMarker :: Bool

display minimum marker

so_maxMarker :: Bool

display maximum marker

so_lastMarker :: Bool

display last marker

Instances

Show SparkOptions

smoothSpark :: SparkOptions

Default options for a smooth sparkline.

barSpark :: SparkOptions

Default options for a barchart sparkline.

Size calculation

sparkSize :: SparkLine -> (Int, Int)

Rendering function

renderSparkLine :: SparkLine -> CRender (PickFn ())

Render a SparkLine to a drawing surface using cairo.

sparkLineToPNG :: FilePath -> SparkLine -> IO (PickFn ())

Generate a PNG for the sparkline, using its natural size.

sparkLineToPDF :: FilePath -> SparkLine -> IO ()

Generate a PDF for the sparkline, using its natural size.