TAchart grid distance

[lightningchaser]

Hi all,

Is it possible to control the grid distance in a TAchart? In the example image the day of the year is on the X-axis and a would like a grid line for every month (first line at 31 second line at 31+28 etc).

[lightningchaser]

is the image visible for you?

[Ask]

TAChart does not currently support arbitrary grid steps.
You can simulate the granularity you need by carefully selecting you scale
(for example, on the screenshot you provided the scale is obviously too large).

This is a good feature to have, and I may implement it in the future.
If you do not want it to be forgotten, please add an issue to the bugtracker.
Also, if you want faster response times from Lazarus developers,
try to communicate via mailing list instead of the forum.
(See links to both bugtracker and maillists on the left panel of the forum).

is the image visible for you?

Yes, the image is visible -- but only for logged-in users.

[Leledumbo]

I was just about to ask the same question.

TAChart does not currently support arbitrary grid steps.

Too bad.

You can simulate the granularity you need by carefully selecting you scale

Is there any document / article explaining about offset and scale?

[lightningchaser]

This is a good feature to have, and I may implement it in the future.
If you do not want it to be forgotten, please add an issue to the bugtracker.
Also, if you want faster response times from Lazarus developers,
try to communicate via mailing list instead of the forum.
(See links to both bugtracker and maillists on the left panel of the forum).

Thnx, I will submit a request to the bugtracker and register to the mailinglist.

[Ask]

You can simulate the granularity you need by carefully selecting you scale

Is there any document / article explaining about offset and scale?
[/quote]
No, moreover, the current offset/scale implementation is not final and might change
in the near future to complete the implementation of multi-axis support.
This support implementation is long planned, but is currently blocked by some changes
rejected by the core Lazarus team, so I need to think of another way to implement it.

Still, you can look at the "axis" demo project to see an example of usage --
it even supports logarithmic axis already ;-)

[Ask]

TAChart does not currently support arbitrary grid steps.

Too bad.

Now it does. See http://bugs.freepascal.org/view.php?id=16030

[lightningchaser]

Now it does. See http://bugs.freepascal.org/view.php?id=16030

Super! I'm currently using the 0.9.28.2 32bit windows lazarus version. What is the easiest way to update to the new version with the new demo program?

[Ask]

You can try a nightly build: http://www.hu.freepascal.org/lazarus/
but note the big warning at the top ;-)
(You need Lazarus-0.9.29-xxxxx-fpc-2.4.0-20100322-win32.exe)

[lightningchaser]

You can try a nightly build: http://www.hu.freepascal.org/lazarus/
but note the big warning at the top ;-)
(You need Lazarus-0.9.29-xxxxx-fpc-2.4.0-20100322-win32.exe)

this build does the job! see attach figure.