TAchart grid distance
lazarus / 55-TAChart

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lightningchaser · 2010-03-13 06:27

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).

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lightningchaser · 2010-03-16 06:29

is the image visible for you?

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Ask · 2010-03-16 23:03

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).

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

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Leledumbo · 2010-03-17 03:22

I was just about to ask the same question.
QuoteTAChart does not currently support arbitrary grid steps.Too bad.
QuoteYou can simulate the granularity you need by carefully selecting
you scaleIs there any document / article explaining about offset and
scale?

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lightningchaser · 2010-03-17 18:22

Quote from: Ask on March 17, 2010, 12:03:42 amThis 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).

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

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Ask · 2010-03-18 04:09

QuoteYou can simulate the granularity you need by carefully selecting
you scaleIs 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 ;-)

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Ask · 2010-03-22 07:05

Quote from: Leledumbo on March 17, 2010, 04:22:55 amQuoteTAChart does
not currently support arbitrary grid steps.Too bad.

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

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lightningchaser · 2010-03-22 12:18

QuoteNow 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?

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Ask · 2010-03-22 12:38

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)

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lightningchaser · 2010-03-23 12:48

Quote from: Ask on March 22, 2010, 01:38:46 pmYou 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.