Steema Central

Hi !

I think it is an easy task, but I can´t find a way - maybe it´s to late

I use the TColorBandTool for marking an area. I got to values back:
Tool.StartValue
Tool.EndValue

These are x values. But how du I get the resulting index of the data table? I need a call like this: I know that this wont work because XValue needs an index / integer value. How can I get the index for a given value?

Maybe I´m blinded ...

Hi Dominik,

Yes, maybe some sleeping would help .

You can use Locate method as in the code snippet I posted here.

hi Narcis,

Ok that works ...
Chart[0].XValues.Locate(Tool.StartValue)

but one little problem left:

If you change the left position of the TColorBandTool then Tool.StartValue can contain values like 20,31252134 which is not a valid X value. The result is -1 ...

Is it possible to have a snapping for the TColorBandTool or the possibility that Locate uses the nearest value within the XValues?

Hi Dominik,

Yes, in that case you need to use TNearestTool and its GetNearestPoint method as in the examples I posted here:

http://www.teechart.net/support/viewtop ... arestpoint
http://www.teechart.net/support/viewtop ... arestpoint

An alternative would be using a TCursorTool set to Snap=true, assign the ColorBand X value to it and let the cursor snap to the nearest point.