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MathGroup Archive 2010

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Digitizing plots with Mathematica (i.e. extracting data points from

  • To: mathgroup at smc.vnet.net
  • Subject: [mg107662] Digitizing plots with Mathematica (i.e. extracting data points from
  • From: Will DeBeest <wildebeestz at gmail.com>
  • Date: Mon, 22 Feb 2010 03:09:06 -0500 (EST)

I've just written a blog post showing how to make a plot digitizer
using Mathematica. It may be of interest to other Mathematica users
particularly anyone who wants to extract some data out of plots.

barChartDigitizer[g_Image] :=
 DynamicModule[{min = {0, 0}, max = {0, 0}, xmin = -1., xmax = 1.,
   pt = {0, 0}, data = {}, img = ImageDimensions[g], output},

  Deploy@Column[{
     Row[{
       Column[{Button["Y Axis Min", min = pt],
         InputField[Dynamic[xmin], Number, ImageSize -> 70]}],
       Column[{Button["Y Axis Max", max = pt],
         InputField[Dynamic[xmax], Number, ImageSize -> 70]}],
       Column[{Button["Add point", AppendTo[data, pt]],
         Button["Remove Last", data = Quiet@Check[Most@data, {}]]}],
       Column[{Button["Start Over", data = {}],
         Button["Print Output",
          Print@Column[{BarChart[
              output =
               Rescale[#, {Last@min, Last@max}, {xmin, xmax}] & /@
                data[[All, 2]],
              PlotRange -> {Automatic, {xmin, xmax}},
              ImageSize -> 400], output}],
          Enabled -> Dynamic[data =!= {}]]}]
       }],
     Row[{
       Graphics[{Inset[
          Image[g, ImageSize -> img]], {Tooltip[Locator[Dynamic[pt]],
           Dynamic[pt]]}},
        ImageSize -> img, PlotRange -> 1,
        AspectRatio -> img[[2]]/img[[1]]]}]
     }]
  ]

A full description will a worked example can be found here:

http://www.wildebeests.net/2010/02/21/digitizing-plots-with-mathematica/


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