This article contains a sample script for creating a choropleth (hatch) map with user defined class ranges.
To run this script:

1. Copy the script below, or click here to download the BAS file: Create_Hatch_Map_UserDefClasses.bas.
2. In a Windows Explorer window, navigate to C:\Program Files\Golden Software\MapViewer 8\Scripter.
3. Double click on Scripter.exe to launch Scripter.
4. Press Ctrl+A to select all of the existing lines then press Delete.
5. If you copied this script, press Ctrl+V to paste it into Scripter. If you downloaded it, click File | Open, select the BAS file from your downloads directory, and click Open.
6. Click Script | Run to run the script.
    

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' Create_Hatch_Map_UserDefClasses.bas
' Copyright (C) Golden Software Inc. 1992-2015
'
' This script creates a hatch map with user-defined class ranges.
'
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Sub Main
  Dim mvApp, plot, hatch As Object
  Dim path As String

  ' Start MapViewer and create a pointer to the application object
  Set mvApp = CreateObject("MapViewer.Application")
  ' Make the application visible
  mvApp.Visible = True
  ' Create a plot document
  Set plot = mvApp.Documents.Add(DocType:=mvDocPlot)

  ' Set the path variable to point to the MapViewer samples folder
  path = mvApp.ApplicationFolder + "samples\"

  ' Create a hatch map of the population in Alabama
  ' Col A contains the PID
  ' Col G contains the population
  Set hatch = plot.CreateHatchMap( _
     BoundaryFileName := path + "al2010.gsb", DataFileName := path + "al2010.dat", _
     PIDCol := 1, VarCol := 7, NumClasses :=3 )

  hatch.ClassificationMethod = mvClassificationUserDefined
  hatch.SetClassMinMaxVals(1,0,20000)
  hatch.SetClassMinMaxVals(2,20000,100000)
  hatch.SetClassMinMaxVals(3,100000,800000)

End Sub

Updated August 20, 2018