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README
Introduction
GChart is a Haskell wrapper around Google Chart API.
There is a library on Hackage called GoogleChart which provides another wrapper, however it has not been updated in a long while. GChart improves upon that effort by trying to design a more elegant API, and supporting more chart types and features.
Installation
cabal install hs-gchart
Documentation
Getting Started
These examples below are available in examples/Examples.hs in the source
tarball. Look at the source file for more Some examples are taken from this
article
For examples 1 and 2, the following code is common
dataSeries1 :: [Int]
dataSeries1 = [10,20,8,25,5,3,15,9,5]
labelSeries1 = ["Egg nog",
"Christmas Ham",
"Milk (not including egg nog)",
"Cookies",
"Roasted Chestnuts",
"Chocolate",
"Various Other Beverages",
"Various Other Foods",
"Snacks"]
Example 1 : Pie Chart
The code below
christmasPie = getChartUrl $ do setChartSize 600 300
setDataEncoding simple
setChartType Pie
addChartData dataSeries1
setChartTitle "Food and Drink Consumed Christmas 2007"
setLabels labelSeries1
setColors ["00AF33",
"4BB74C",
"EE2C2C",
"CC3232",
"33FF33",
"66FF66",
"9AFF9A",
"C1FFC1",
"CCFFCC" ]
Generates the following chart.
Example 2 : Bar Chart
The code below
barGraph = getChartUrl $ do setChartSize 600 300
setDataEncoding simple
setChartType BarHorizontalGrouped
addChartData dataSeries1
setChartTitle "Food and Drink Consumed Christmas 2007"
addAxis $ makeAxis { axisType = AxisBottom }
addAxis $ makeAxis { axisType = AxisLeft,
axisLabels = Just labelSeries1 }
addColor "00AF33"
Generates the following chart
Example 3 : Line XY Chart 1
The code below
linexyGraph1 =
getChartUrl $ do setChartSize 800 300
setChartType LineXY
setDataEncoding text
setChartTitle "Projected Christmas Cheer for 2007"
setGrid $ makeGrid { xAxisStep = 3.333,
yAxisStep = 10,
lineSegmentLength = Just 1,
blankSegmentLength = Just 3 }
addAxis $ makeAxis { axisType = AxisLeft,
axisRange = Just $ Range (0,100) (Just 50) }
addAxis $ makeAxis { axisType = AxisBottom,
axisLabels = Just $ ["Dec 1st"] ++ blanks 4 ++ ["6th"] ++ blanks 18 ++ ["25th","26th"] ++ blanks 4 ++ ["Dec 31st"] }
addChartDataXY dataSeries2
dataSeries2 :: [(Float,Float)]
dataSeries2 = [(0,0),(100,100)]
blanks x = take x $ repeat ""
Generates the following chart
Example 4 : Line XY Chart 2
The code below
linexyGraph2 =
getChartUrl $ do setChartSize 800 300
setChartType LineXY
setDataEncoding text
setChartTitle "Projected Christmas Cheer for 2007"
setGrid $ makeGrid { xAxisStep = 3.333,
yAxisStep = 10,
lineSegmentLength = Just 1,
blankSegmentLength = Just 3 }
addAxis $ makeAxis { axisType = AxisLeft,
axisRange = Just $ Range (0,100) (Just 50) }
addAxis $ makeAxis { axisType = AxisBottom,
axisLabels = Just $ ["Dec 1st"] ++ blanks 4 ++ ["6th"] ++ blanks 18 ++ ["25th","26th"] ++ blanks 4 ++ ["Dec 31st"] }
addChartDataXY dataSeries3
addColor "458B00"
addChartDataXY dataSeries4
addColor "CD2626"
setLegend $ legendWithPosition ["2006","2007"] LegendRight
dataSeries3 :: [(Float,Float)]
dataSeries3 = zip [0,16.7,23.3,33.3,60,76.7,83.3,86.7,93.3,96.7,100] [30,45,20,50,15,80,60,70,40,55,80]
dataSeries4 :: [(Float,Float)]
dataSeries4 = zip [0,10,16.7,26.7,33.3] [50,10,30,55,60]
blanks x = take x $ repeat ""
Generates the following chart
Example 5 : Scatter Plot with Shape Markers
The code below
scatterPlotWithMarkers = getChartUrl $ do setChartSize 200 125
setChartType ScatterPlot
setDataEncoding simple
addChartDataXY dataSeries5
addAxis $ makeAxis { axisType = AxisBottom,
axisLabels = Just $ blanks 1 ++ ["1","2","3","4","5"] }
addAxis $ makeAxis { axisType = AxisLeft,
axisLabels = Just $ blanks 1 ++ ["50","100"] }
setGrid $ makeGrid { xAxisStep = 20, yAxisStep = 25 }
addShapeMarker $ makeShapeMarker { shapeType = ShapeSquare
, shapeColor = "ff0000"
, shapeSize = 10 }
-- Reverse engineering sample data from webpage
dataSeries5 :: [(Int,Int)]
dataSeries5 = zip xseries yseries where
xseries = map encSimpleReverse "984sttvuvkQIBLKNCAIipr3z9"
yseries = map encSimpleReverse "DEJPgq0uov17_zwopQOD"
encSimpleReverse :: Char -> Int
encSimpleReverse c | ord c >= ord 'A' && ord c <= ord 'Z' = (ord c - ord 'A')
| ord c >= ord 'a' && ord c <= ord 'z' = 26 + (ord c - ord 'a')
| ord c >= ord '0' && ord c <= ord '9' = 52 + (ord c - ord '0')
| otherwise = -1
Generates the following chart