等間隔分類

Public Function GetEqualIntervalBreaks _
                     (ClassifyLayer As ITable, FieldName As String, NumClasses As Long) As Double()
' 分類するための新規TableHistogramの作成
    Dim pTableHistogram As ITableHistogram
    Dim pHistogram As IHistogram
    Set pTableHistogram = New TableHistogram
    Set pHistogram = pTableHistogram
' テーブルとフィールド･プロパティの割り当て
    Set pTableHistogram.Table = ClassifyLayer 'FeatureLayer：ITableをサポート
    pTableHistogram.Field = FieldName
' TableHistogramオブジェクトに値と頻度を設定
    Dim vFrequency As Variant
    Dim vValues As Variant
    pHistogram.GetHistogram vValues, vFrequency
' 等間隔分類(EqualInterval)内の値を使用
    Dim pClassify As IClassify
    Set pClassify = New EqualInterval
    pClassify.SetHistogramData vValues, vFrequency
' クラスの作成
    pClassify.Classify NumClasses
    GetEqualIntervalBreaks = pClassify.ClassBreaks
End Function