Constant line on XYChart

Hi Sérgio,

Thanks for evaluating our Charts.  You could use the Ranges feature (see related QuickStart for an example) with a very thin range to render a line.

As for zooming, we don't support that feature at this time but I will log your request for it.

Hi, thank you for your quick response.

Using Range to simulate a "constant line" is a workaround that could work but consider to support a specific way of doing it. Something that needs only a value (for range you need to set two values, max and min, and do an adjustment for a thin line!)

I found two issues on using Range (I have a sample project that demonstrate these issues, how can I send it to you?):

- As I'm using two axis for Y, it seems that all Ranges are "attached" to Y2 (humidity).

Snippet for related code: 

<charts:XYChart.YAxes>

<charts:XYDoubleAxis x:Name="yAxis1" Title="Temperature" AreMajorTicksVisible="True" TickMajorInterval="5" Position="NearEdge">

<charts:XYDoubleAxis.Ranges>

<charts:XYRange Maximum="11.1" Minimum="10.9" Background="Red"/>

<charts:XYRange Maximum="-5.1" Minimum="-4.9" Background="Blue"/>

</charts:XYDoubleAxis.Ranges>

</charts:XYDoubleAxis>

<charts:XYDoubleAxis x:Name="yAxis2" Title="Humididty" AreMajorTicksVisible="True" TickMajorInterval="5" Position="FarEdge">

<charts:XYDoubleAxis.Ranges>

<charts:XYRange Maximum="60.1" Minimum="59.9" Background="Green"/>

<charts:XYRange Maximum="45.1" Minimum="44.9" Background="Yellow"/>

</charts:XYDoubleAxis.Ranges>

</charts:XYDoubleAxis>

</charts:XYChart.YAxes>

- It seems that Range do not support negative values!

this range doesn't appear at all:

<charts:XYRange Maximum="-5.1" Minimum="-4.9" Background="Blue"/>

Thanks

Hello,

If you have a simple sample project showing the two issues, can you please send it to our support address?  Be sure to rename the .zip file extension so that it won't get spam blocked.

I have marked down the suggestion of supporting a single-value annotation line.

For the negative values issue, I wonder if the problem there is that you need to flip the Maximum and Minimum values.  I would think that the Maximum should be the higher (more positive) value.  Try to flip those and see if it fixes that problem.

Thanks!