Dynamic MajorTickInterval value

[Ye HaoChen]

Hi,

I need DateTimeCategoricalAxis.MajorTickInterval's value is dynamic.

For examaple:
I have a list binding with a LineSeries. the list's count are dynamic.
When the number of list is extremely small or large, it will be necessary to set the value of MajorTickIntrval dynamic.
So, the DateTimeCategoricalAxis.MajorTickInterval's value need to changed with List.count.
like:

//Count: List's count
//MajorStepNum: How many labels are there below the X axis.
MajorTickInterval = Count / MajorStepNum > 1 ? Count / MajorStepNum + 1 : 1;

But the DateTimeCategoricalAxis.MajorTickInterval can not be Binding.(will thrown an exception)
So, have other way can be done this? (Except for the assignment MajorTickInterval)

Thanks

[Petar Marchev]

Hi,

You are absolutely correct, the MajorTickInterval cannot be bound because it is not a dependency property. However you should still be able to achieve the desired effect with code behind.

Regards,
Petar Marchev
Telerik

[Ye HaoChen]

If it is not a dependency property, will break the MVVM architecture.
Do you have any way to solve it?

The Chart in the ListItemTemplate, and MajorTickInterval changes according to the List item data.
In this situation I don't know how to do.

[Petar Marchev]

Hi Ye HaoChen,

You can create a new attached property and use it to set the MajorTickInterval:

public static class ChartUtilities
{
 public static readonly DependencyProperty MajorTickIntervalProperty = DependencyProperty.RegisterAttached(
 "MajorTickInterval"
 typeof(int),
 typeof(ChartUtilities),
 new PropertyMetadata(null, OnMajorTickIntervalChanged));

public static int GetMajorTickInterval(DependencyObject obj) ....
public static int Set....

private static void OnDrillDownHelperChanged(DependencyObject target, DependencyPropertyChangedEventArgs args)
{
 var axis = target as DateTimeCategoricalAxis;
 axis.MajorTickInterval = (int)args.NewValue;
 ....

<telerik:DateTimeCategoricalAxis utilities:ChartSeriesGenerator.MajorTickinterval="{Binding ...}" />

Regards,
Petar Marchev
Telerik

[Ye HaoChen]

I would rather appreciate if you could give an example.

Regards
Haochen.Ye

[Coder]

Could this post please be elaborate on further? Possibly with some example code?

Thanks.

[Valerio]

Same here, could you post an example or extend/complete the code snippet above?

Thanks

[Petar Marchev]

There you go guys.

Regards,
Petar Marchev
Telerik