The Google Chart API also has great support for bar graphs. In this recipe, we will produce a bar graph of two sets of inputs in the same diagram to show the usefulness of this API.
Install the GoogleChart package as follows:
$ cabal install hs-gchart
Create two files called input1.txt and input2.txt with numbers inserted line by line as follows:
$ cat input1.txt 2 5 3 7 4 1 19 18 17 14 15 16 $ cat input2.txt 4 2 6 7 8 2 18 17 16 17 15 14
Import the Google Chart API library as follows:
import Graphics.Google.Chart
Gather the two input values from both the text files and parse them as two separate lists of integers, as shown in the following code snippet:
main = do rawInput1 <- readFile "input1.txt" rawInput2 <- readFile "input2.txt" let nums1 = map (read :: String -> Int) (lines rawInput1) let nums2 = map (read :: String -> Int) (lines rawInput2)
Set up the bar chart too and print out the Google Chart...