Automatic Axis Increment

[Lykke]

Dear Support Team

We have an issue with the axis automatic increment being not well selected. Steps to reproduce are the following:

1. Add a TChart to a form
2. Add a TPointSeries to the Chart
3. Add the following code:
Chart1.LeftAxis.SetMinMax(-0.855,0.855);
Chart1.BottomAxis.SetMinMax(-0.855,0.855);
Series1.AddXY(-0.475,0.151);
Series1.AddXY(0.475,0.151);

This result in bottom axis having just one label (at zero) as shown in attached screendump. Why is the automatic axis increment not working well in this case?

[Yeray]

Hello,

I'm afraid the algorithm for the automatic axis increment has limitations and it's difficult to handle all the possibilities.

[Lykke]

I understand it is difficult to handle all situations, but it is a very simple case that I think it should handle.

The example can be even simpler as there is no need to add the points. Just these lines give exactly the same behavior:

Chart1.LeftAxis.SetMinMax(-0.855,0.855);
Chart1.BottomAxis.SetMinMax(-0.855,0.855);

In the example the axis limits are the same on both axes and no points are added. The left axis increment is well selected, but not on the bottom axis which lead to exactly the same as uploaded earlier. I think automatic axis increments should cover such simple example.

[Yeray]

Hello,

We've discussed about it and ended adding a fix for this (#2589).
Since you own the sources, you can apply it and recompile.

Search for this line in TeEngine.pas:

Code: Select all

        if tmp.Active and IsAssociated(tmp) then

Modify it for this:

Code: Select all

        if tmp.Active and IsAssociated(tmp) and
           HasLabels(tmp) and not HasNoMandatoryValues(tmp) then

[Lykke]

I have done the change and confirm that it is working. Thanks a lot for your support!

[Yeray]

Hello,

Great. Thanks for the feedback!