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Scale.NiceRange

Computes a "nice" axis range with rounded min, max, and tick interval Returns values suitable for human-friendly axis labelling

DaxLib.SVG.Scale.NiceRange( dataMin, dataMax, maxTicks, includeZero )
Parameter Type Required Description
dataMin NUMERIC VAL Minimum value from source data
dataMax NUMERIC VAL Maximum value from source data
maxTicks INT64 Optional: Desired maximum number of ticks. Defaults to 5
includeZero BOOLEAN Optional: Whether to include zero in the range when data is fully positive. Defaults to FALSE.

TABLE Single-row table with @NiceMin, @NiceMax, @NiceInterval, @NiceTickCount

DaxLib.SVG.Scale.NiceRange( 3.2, 97.8, 5, TRUE )
// Returns single-row table:
//   @NiceMin = 0
//   @NiceMax = 100
//   @NiceInterval = 25
//   @NiceTickCount = 5

function 'DaxLib.SVG.Scale.NiceRange' =
        (
            dataMin: NUMERIC VAL,
            dataMax: NUMERIC VAL,
            maxTicks: INT64,
            includeZero: BOOLEAN
        ) =>

            VAR _MaxTicks = IF( ISBLANK( maxTicks ) || maxTicks < 2, 5, maxTicks )
            VAR _IncludeZero = IF( ISBLANK( includeZero ), FALSE(), includeZero )
            VAR _DataMin = IF( _IncludeZero && dataMin > 0, 0, dataMin )
            VAR _DataMax = dataMax
            VAR _Range = _DataMax - _DataMin
            VAR _NiceInterval =
                IF(
                    _Range = 0,
                    IF( _DataMax = 0, 1, DaxLib.SVG.Scale.NiceNum( ABS( _DataMax ) * 0.2, TRUE() ) ),
                    DaxLib.SVG.Scale.NiceNum( _Range / ( _MaxTicks - 1 ), TRUE() )
                )
            VAR _NiceMin = INT( _DataMin / _NiceInterval ) * _NiceInterval
            VAR _NiceMax = -INT( -_DataMax / _NiceInterval ) * _NiceInterval
            VAR _NiceTickCount = INT( ( _NiceMax - _NiceMin ) / _NiceInterval ) + 1

            RETURN
                ROW(
                    "@NiceMin", _NiceMin,
                    "@NiceMax", _NiceMax,
                    "@NiceInterval", _NiceInterval,
                    "@NiceTickCount", _NiceTickCount
                )