Steema Central

We often show process values/parameters using multiple Line series:
Now we want to highlight values per Line series that are outside certain user given min/max limits. Is there a TChart Tool or a certain Series for that, or do we need to develop our own tool for that? Like drawing something on the Canvas in the OnAfterDraw event of the Chart etc.

Hello,

I believe you are trying to achieve something very similar to what was discussed in this thread.
Take a look at the example here.

Hello Yeray,

Thanks for the Tip, but all these lines add too much "Noise" to the graphics. I am now creating an extra TPointSeries that contains the violating Points as Yellow semitransparent circles. So the graphics only gets more populated with "stuff" in case there are min/max violations. But maybe I will use your tip for some other purpose.

Thanks and best regards,

Thomas

Hello,

Of course drawing the horizontal threshold line(s) is just an option.
Also note it's simpler if you only want to draw pointers where the values are out of the range; the tricky part in that example was to change the line pen between the in-range and the out-range points.