Unfortunately, we did not have time to implement custom divisions for the initial release of the WPF controls. For now, the only way to add divisions to a scale is through the MajorDivisions property.
Below is an example helper that adds one custom division to a double scale. You can add this as a static resource and bind the Mode and LabelPresenter properties to have the division appear.
public class CustomDivisionHelper {
private readonly RangeDivisionsMode _mode;
private readonly ValuePresenter _presenter;
public CustomDivisionHelper( ) : this( 4.2 ) { }
public CustomDivisionHelper( double customDivision ) {
_mode = new CustomDivisionsMode( customDivision );
_presenter = new CustomFormatter( customDivision );
}
public RangeDivisionsMode Mode { get { return _mode; } }
public ValuePresenter Presenter { get { return _presenter; } }
private sealed class CustomDivisionsMode : RangeDivisionsMode {
private readonly double _customDivision;
public CustomDivisionsMode( double customDivision ) { _customDivision = customDivision; }
public override bool RequiresDivisionsEstimate { get { return Auto.RequiresDivisionsEstimate; } }
public override IList<TData> GetDivisions<TData>( IRangeDataMapper<TData> mapper, int divisionsEstimate ) {
var divisions = new List<double>( Auto.GetDivisions( (IRangeDataMapper<double>)mapper, divisionsEstimate ) );
int index = divisions.BinarySearch( _customDivision );
if( index < 0 )
divisions.Insert( ~index, _customDivision );
return (IList<TData>)divisions;
}
public override IList<TData> GetSubdivisions<TData>( IRangeDataMapper<TData> mapper, IList<TData> dependentDivisions ) {
return Auto.GetSubdivisions( mapper, dependentDivisions );
}
}
private sealed class CustomFormatter : GeneralValueFormatter {
private readonly double _customDivision;
public CustomFormatter( double customDivision ) { _customDivision = customDivision; }
protected override UIElement VisualizeCore<TData>( TData value, ValuePresenterArgs args, UIElement existingVisual ) {
UIElement visual;
if( _customDivision.Equals( value ) ) {
visual = base.VisualizeCore( "custom", args, existingVisual );
Panel.SetZIndex( visual, 10 );
}
else {
visual = base.VisualizeCore<TData>( value, args, existingVisual );
Panel.SetZIndex( visual, 0 );
}
return visual;
}
}
}
~ Paul H
