Hi Ding,

Thank you for following up.

I understand that the suggested approach does not meet your requirement completely as the TickOrigin and Last values might differ from the MinimumValue and MaximumValue. The Custom Axis Tickmark Values approach is the way to go about this, however you are right that the example given in the documentation demonstrates statically defined values.

In an effort to adopt this approach to allow dynamically specifying the tick origin and interval values, I further modified the sample, so that an instance of the CustomTickmarkValues class is added as a member of the View Model and this instance is bound to the NumercYAxis TickmarkValues property:

TickmarkValues="{Binding CustomTickMarkVals, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

public CustomTickmarkValues(double tickOrigin, double interval, double last)
{
    // define custom tickmark values
    this.Tickmarks = new DoubleCollection();
    int tickCnt = (int)((last - tickOrigin) / interval) + 1;
    for (int i = 0; i < tickCnt; i++)
    {
       this.Tickmarks.Add(tickOrigin + i * interval);
    }
}

The CustomTickmarkValues class constructor is modified to include the tick origin, interval and last (maximum value) as parameters, which are used to calculate the tick mark values. In case the min and max value are required to also be marked, their values can be added to the Tickmarks collection in the Initialize method:

this.Tickmarks.Add(this.First);
this.Tickmarks.Add(this.Last);

Additionally, the bound CustomTickmarkValues object from the view model is reinitialized whenever the tick origin, interval or last values get changed, so that the change gets reflected.

Please, check out the modified sample and let me know if it helps achieve your requirement.

Best regards,
Bozhidara Pachilova
Infragistics