TimeLine or TimeBar in VideoEditor (new question)

[Mike5]

Following up on the topic raised by Marcelo, I am also investigating the use of the RadTimeLine and RadTimeBar as controls for a video editor.  My goal is to enable both a large scale view of  key frames, over an hour perhaps, and also permit zooming down to a fine grain view of key  frames... at 4 mSec resolution perhaps.

What I observe is that if I define a RadTimeBar like this, with a 10 second period, I can zoom only down to 30 mSec:

<telerik:RadTimeBar x:Name="xRadTimeBar" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1"
                            PeriodStart="1/1/2011 00:00:00"
                            PeriodEnd="1/1/2011 00:00:10"
                            VisiblePeriodStart="1/1/2011 00:00:00"
                            VisiblePeriodEnd="1/1/2011 00:00:10"
                            SelectionStart="1/1/2011 00:00:00"
                            SelectionEnd="1/1/2011 00:00:10"
                            IsSnapToIntervalEnabled="True"
                            >
            <telerik:RadTimeBar.Intervals>
                <telerik:MinuteInterval IntervalSpans="1"/>
                <telerik:SecondInterval IntervalSpans="1"/>
                <telerik:MillisecondInterval IntervalSpans="4, 16, 32, 64"/>
            </telerik:RadTimeBar.Intervals>

        </telerik:RadTimeBar>

But with a period of 1 second, I can zoom down to 4 mSec:

<telerik:RadTimeBar x:Name="xRadTimeBar" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1"
                            PeriodStart="1/1/2011 00:00:00"
                            PeriodEnd="1/1/2011 00:00:01"
                            VisiblePeriodStart="1/1/2011 00:00:00"
                            VisiblePeriodEnd="1/1/2011 00:00:01"
                            SelectionStart="1/1/2011 00:00:00"
                            SelectionEnd="1/1/2011 00:00:01"
                            IsSnapToIntervalEnabled="True"
                            >
            <telerik:RadTimeBar.Intervals>
                <telerik:MinuteInterval IntervalSpans="1"/>
                <telerik:SecondInterval IntervalSpans="1"/>
                <telerik:MillisecondInterval IntervalSpans="4, 16, 32, 64"/>
            </telerik:RadTimeBar.Intervals>

       </telerik:RadTimeBar>

Maybe I am not using the control correctly... but if I am, it seem to me that zooming into mSec from a period greater than a few seconds is not supported.  Is that correct?

Changes to the VisiblePeriod values appears to make no difference, the final granularity appears to be tied to the PeriodStart/End values.

Usage advice greatly appreciated!


Thanks,
   Mike

[Tsvetie]

Hello Mike,

We already answered your support ticket with the same question. For your convenience, I give you the information here as well:

This limitation actually comes from the maximum width that RadTimeBar allows for its content. Currently, we have set a maximum of 30000 pixels for the content for performance reasons. So for a shorter period you will be able to zoom further in. We have a few ideas how we can improve the control for such scenarios, but I cannot give you a precise estimate, when we will allow for unlimited in width content in the timebar.

All the best,
Tsvetie
the Telerik team

[Alexandre]

Hi,
I'm evaluating RadTimeBar and looking for similar precisions (like 4-6min down to a couple of milliseconds). Is there any improvement of the component coming in this field?
Also, If I patch Telerik assembly and change the hardcoded 30000 pixels limit to some higher values, what are the performance reasons? I thought that the content would be clipped correctly by WPF. It would mostly depends on the number of underlying visual elements in the content, or there is something else?
Thanks

[Tsvetie]

Hello Alexandre,

In the current version of RadTimeline for WPF, you can specify a MinZoomRange value, depending on your specification and the value will be respected.

Regards,
Tsvetie
Telerik