Histogram data range display

My histogram class looks like this:

public class Histogram
{
  public class Bin
  {
     public Decimal Min { get; set; }
     public Decimal Max { get; set; }
     public Decimal Mid { get { return (Min + Max) / 2; } }
     public int Count { get; set; }
  }

  public Histogram() { Values = new ObservableCollection<Bin>(); }
  public ObservableCollection<Bin> Values { get; set; }
  public decimal Range { get; set; }
  public decimal Minimum { get; set; }
  public decimal Maximum { get; set; }

  public void Generate<T>(IEnumerable data, Func<T, decimal?> grabber, int num_bins, bool integral) {}
}

And I'm displaying with

        <ms:BarSeries BarSizeFactor="1" ItemsSource="{Binding VoltageHistogram.Values}"
                      XBinding="{Binding Mid}" YBinding="{Binding Count}"
                      />

I have a few questions:

1. I looked in the examples and forums, but it wasn't clear to me the best way to make a tooltip on each bar stating its Min/Max
2. Due to rounding (2 decimal places for non-integral, 0 for integral) and accumulation, the bins are not necessarily all the same width. Is it possible to bind the BarSizeFactor to a Bin width factor (Max-Min/Range) to accurately show its relative extent?
3. Can I get the x axis to display tick marks at exactly Values[i].Minimum + Maximum? If not, Can I get it to start at Minimum, end at Maximum, and have ticks at Range intervals?

Finished my failed sample project from the previous request and threw some sample data in that I've been working with.

Thanks!

Hi matelich,

1) A good way to provide tool tips would be to create a custom bar style, and set the tool tips on the visuals there. Here is an example:

<Style x:Key="BarStyle" TargetType="{x:Type ms:Bar}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate>
        <Border Background="{TemplateBinding Background}" ToolTip="{Binding Max}">
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

Then, set the BarStyle property of the bar series to be this bar style. To display both min and max in the tool tip, you could create a multi converter, and use that in a multiple binding that takes those 2 values and converts it into a combined string. Or, you could provide a tool tip template.

2) Unfortunately the BarSeries only supports equal width bars, and we don't plan to add support for this. I hope this is not critical.

3) The axis also does not have a way to have uneven spacing between the ticks, (unless you provide a custom axis-value-converter to plot the data on a custom scale. This is what we do to handle a different number of days in each month when plotting time data, or skewing the positions of minor logarithmic ticks, but I don't think a custom scale will be a good solution for you). Sorry I could not be of more help here.

-Jason Fauchelle