I was wondering if the following features are possible with the NetAdvantage line chart, and if so how to use it.We use line charts to show a variable amount of data across a variable time domain. For instance, 3 years worth of patient temperature data. In some periods, 1 measurement per month can have been recorded. In another period, a measurement would have been done every 2 hours. The user looking at the graph might be interested in the 3-year trend, or the data of the last 48 hours. Exactly how much data each patient has and the timespan in which it occurs differs for each patient. The user is presented with the entire data set, and will do plenty of zooming and scrolling.One problem we run into is how to present the x-axis labels. We need:1. Dynamic x-axis text labels. When looking at a timespan of 3 years we do not want the time included in the text label. When looking at a timespan of hours, we do not want to repeat the date in each x-axis label.2. Visual grouping of parts of the x-axis, so that we can for instance specify the date only once for multiple ticks that occur on that date (but at different times). Something like the attached (google) example. How the grouping occurs should be dynamic and depend on zoom level (i.e. days, weeks, months, years).
Preferably we would use a purely declarative method (we use MVVM and try to keep the code behind to a minimum), we want to avoid having to do this programmatically.Are the described scenarios possible with NetAdvantage? Is there documentation describing how to do this?
So if there is a large gap in time between values in the chart, you would want there to be a large space, and an interpolated line from the previous to the next point?
The CategoryDateTimeXAxis on the xamDataChart fulfills these needs but its axis labels do not natively support some of the advanced scenarios you propose. It may be possible to augment their abilities with application code to meet your requirement, though, and you could make a feature request.
I will experiment with your request and get back to you.
-Graham
Graham Murray"]So if there is a large gap in time between values in the chart, you would want there to be a large space, and an interpolated line from the previous to the next point?
If I understand you correctly that is not what I'm asking. My request concerns the X axis labels only, not the data points and how they're connected.
An issue I'm running into with your code example is the following:
When zooming/scrolling the example works, but when the chart is resized (i.e. HorizontalAlignment is set to Stretch), when MeasureOverride is triggered, all the DateLabels have a Date of DateTime.MinValue
Hmm...
I don't seem to be experiencing this. Is there anything else you can tell me to help me reproduce the problem?
I am attempting to run sample using xamDataChart v11.2 but causes an exception at runtime. The "DateLabel" template Parent is null and hence the GetSortedLabels function cannot be executed.
Any ideas anybody?
I am using v15.1 and having the same issue as Paril in the comment above. Any ideas as to why DataLabel's aprent is NULL?
Since the time Graham posted that code we have made some changes to how axis are rendered so that is the likely reason why the code no longer works. I updated the code to work with 15.1 now. Check out my attached sample.
Thanks for the example Rob, your example works as advertised. Unfortunately, CategoryXAxis requires all series on the chart to have all x-values "aligned", so if I have two series that do not have completely matching times for the x-axis data, the second series will not be rendered (see http://ko.infragistics.com/community/forums/p/38082/220246.aspx). I tried to drop in a CategoryDateTimeXAxis in the example since it allows "non-aligned" x-values but that doesn't work - for example, simply changing this:
<igChart:CategoryXAxis x:Name="xAxis" ItemsSource="{StaticResource data}">
to this:
<igChart:CategoryDateTimeXAxis x:Name="xAxis" ItemsSource="{StaticResource data}" DateTimeMemberPath="Date">
does not work. Any suggestions on how to alter your example for this type of X-Axis?