With the release bits is there a more elegant solution to this or shold I still use the code from your previous post? In the post you linked to you indicated that the initial release did not have the bits to make this elegant.

Actually any example you have would be helpful. Since I am adding all series, axes, etc. dynamically from code I have difficulties getting the standard functionality to work much less something a bit more advanced like this.

Thanks!
Mike

Crap...it seems there is always something in the way of cmpleting this task.

So, if I need something where I can control the number of axis lables/interval, the labels display as dates but also need 10 seconds to look smaller than 60 seconds what axis type would most closely accomplish those goals? Can I use numeric axis and just override how the labels are displayed or will I run into other issues?

Mike

Mike,
Here's how you might use the NumericXAxis to have greater control over the time labels that are displayed.
This sample pushes the minimum and maximum so that an even number of minutes is represented in the range.
Then it sets the interval equal to 20 seconds. So a tickmark will be displayed every 20 seconds. Is this more what you are after?
Hopefully the CategoryDateTimeXAxis will soon also support your scenario, but it doesnt currently allow for you to have this degree of configuration.

The Xaml:

<UserControl.Resources>
        <local:TicksToDateTime x:Key="converter" />
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <ig:XamDataChart  Name="xamDataChart1" 
                          HorizontalZoomable="True"
                          VerticalZoomable="True">
            <ig:XamDataChart.Axes>
                <ig:NumericXAxis x:Name="xAxis" >
                    <ig:NumericXAxis.Label>
                        <DataTemplate>
                            <TextBlock 
                            Text="{Binding Path=Item, Converter={StaticResource converter}, ConverterParameter='hh:mm:ss'}" />
                        </DataTemplate>
                    </ig:NumericXAxis.Label>
                </ig:NumericXAxis>
                <ig:NumericYAxis x:Name="yAxis" MinimumValue="0" MaximumValue="8" />
            </ig:XamDataChart.Axes>
            <ig:XamDataChart.Series>
                <ig:ScatterLineSeries x:Name="scatter"
                                      XAxis="{Binding ElementName=xAxis}"
                                      YAxis="{Binding ElementName=yAxis}"
                                      XMemberPath="XValue"
                                      YMemberPath="YValue"
                                      />
            </ig:XamDataChart.Series>
        </ig:XamDataChart>
    </Grid>

And the code behind:

public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            DateTimeData data = new DateTimeData();
            NumericXAxis a = xamDataChart1.Axes.OfType<NumericXAxis>().First();
            DateTime s = data[0].XValue;
            DateTime e = data[data.Count - 1].XValue;

            //push the min and max to be on even minute values.
            s = new DateTime(s.Year, s.Month, s.Day, s.Hour, s.Minute, 0 , 0);
            e = new DateTime(e.Year, e.Month, e.Day, e.Hour, e.Minute + 1, 0, 0);

            a.MinimumValue = s.Ticks;
            a.MaximumValue = e.Ticks;
            //set the gridline/label interval to 20 seconds.
            a.Interval = TimeSpan.FromSeconds(20).Ticks;

            xamDataChart1.Series[0].ItemsSource = data;
        }

    }

    public class TicksToDateTime
        : IValueConverter
    {
        public object Convert(
            object value, 
            Type targetType, 
            object parameter, 
            System.Globalization.CultureInfo culture)
        {
            if (value is double &&
                targetType == typeof(string))
            {
                string param = parameter as string;
                double val = (double)value;
                if (!string.IsNullOrEmpty(param))
                {
                    return new DateTime((long)val)
                        .ToString(param, culture.DateTimeFormat);
                }
                else
                {
                    return new DateTime((long)val)
                        .ToString(culture.DateTimeFormat);
                }
            }
            return "";
        }

        public object ConvertBack(
            object value, 
            Type targetType, 
            object parameter, 
            System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public class DateTimeData
        : ObservableCollection<DateTimeDataItem>
    {
        public DateTimeData()
        {
            for (int i = 0; i < 100; i++)
            {
                Add(new DateTimeDataItem() 
                { 
                    XValue = DateTime.Now.AddSeconds(i), 
                    YValue = i % 6 
                });
            }
        }
    }

    public class DateTimeDataItem
    {
        public DateTime XValue { get; set; }
        public double YValue { get; set; }
    }

Hope this helps! Please note the scatter line chart's performance is currently not as good as line series, so make sure it is still a good fit for your scenario.
Let me know if you have any questions.

-Graham

Graham,

Will I have to use the ScatterLineSeries? Can I not use a StepLineSeries with the NumericXAxis? I haven't looked thorugh the example yet but there will be occations when I will have several hundred thousand points to plot (possibly into the millions).

I see now why I cannot use the StepLineSeries...this could be a problem.

How difficult (or even if possible) do you think it would be to use a CategoryDateTimeXAxis for my series hiding the xaxis gridlines and then add in a ScatterLineSeries with the same number of points with nulls for the y and all the same dates in tick simply for the xaxis labels?

Mike,

You might be able to do that. I'll try it out in the sample I sent you and let you know.

-Graham

Mike,

There are situations where you should not share a CategoryDateTimeXAxis in the same way that you should not really share a CategoryXAxis unless the series have the same labels and number of items. If you have the same number of items with the same dates assigned then you should be able to share the CategoryDateTimeXAxis. Sharing the NumericXAxis or NumericYAxis should not be a problem in those other scenarios as their range will just expand to accomodate all the series that they are assigned to.

-Graham

Oh, I read that and then completely forgot about that issue. I am usging the new service release now so I removed that code. This works so far. Hopefully I won't run into any new issues.

If I am dynamically adding multiple series that all will have the same time period should I have them all use the same axes or should they all use independent x axes?

along with the multiplication your were curious about.

Graham,

Perhaps this is a stupid question but I just can't figure out why you multiply the ticks by 170000?