Y axis Auto scaling

[User (Legacy)]

I'm using ChartFX .Net 6.2. I have embedded the ChartFX control onto a form, 

which allows the user to set appearance options relating to their chart.

Now I see from your knowledge base article Q7102046 says that once min/max 

values for the Y-axis have been set to explicit values they cannot be set 

back to Auto. The KB article says this is by design and presents some code 

to achieve the same. Trouble is, how does the end user achieve this? We have 

a  form that embeds ChartFX's control, and the user can change the Y axis 

properties by Right clicking the Y axis to see a ChartFX dialog, with 3 tabs 

and the Y-axis tab highlighted. The Y axis tab contains text boxes for 

editting the min/max values for the Y axis.

Values of Auto entered into min/max are ignored as explained by the 

knowledge base article. So it appears there is no way to set the auto 

scaling back using this form. The only solution to this problem seems to be 

to scrap the use of the Chart FX control in our form and build everything 

ourselves and just set the API. This is not a very desirable workaround. Big 

question is, why is this limitation by design? Will ChartFX not consider 

putting a button on this form to allow the Auto scaling to be reset?

Thanks,

Chris

[Software FX]

The reason is complicated. Complicated scenarios with multiple axes, units 

etc. makes this option very dangerous. You need to realize that your 

scenario is just one of many possible.

Since you know your scenario better, you can provide a simple UI to 

Re-Calculate the chart scale. You only need to program this ONE UI, I don't 

see a reason why you will need to stop using all the rest, you can provide 

this UI as a custom command (User Command) in Chart FX or in your own 

menu/toolbar.

The command will simply do the code listed in the article:

axis.AutoScale = true;

RecalcScale();

Also, you could ask the user whether he wants to recalculate the scale upon 

exiting the options dialog, in this case, you will receive an 

InternalCommand event with ID = CommandID.Apply.

If you want to prevent your users from changing the Min and Max, you can do:

chart1.Style &= ~ChartStyle.Scale;

-- 

Francisco Padron

www.chartfx.com