TAChart: Vertical Labels
lazarus / 55-TAChart

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wp · 2012-03-02 21:03

When I rotate the labels of the bottom axis by 90 degrees I get the
impression that the default font suddenly looks like to a typewriter
kind of font (fixed character width). How to avoid that?

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Ask · 2012-03-03 09:33

I have just tested various fonts and orientations configurations with
labels
demo and was unable to reproduce this effect.
Which widgetset and font are you using? Which drawer (I assume the
default)?
Can you reproduce the problem with labels demo?
Can you post a screenshot?
Note that TAChart only passes orientation values to the drawer,
so if the problem exists, it is likely in the underlying library.

If all else fails, you can try BGRABitmap back-end --
it performs rotation pixel-by-pixel (with antialiasing), so the
resulting label
looks betters and is guaranteed to be of the same font as the
horizontal text.

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wp · 2012-03-03 12:30

Here are screenshots for vertical and horizontal labels taken from
Windows 7/64 bit. Lazarus (32-bit) is yesterday's snapshot on FPC 2.6.

Comparing the two images in more detail, I'd say, in contrast to my
first posting, that the font is the same, but the character spacing
has changed which gives the impression of a fixed-pitch font.

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Ask · 2012-03-03 14:14

Hm. I have Exactly the same setup, and as you can see from the
attached screenshot (from slightly modified labels demo), I do not
have the issue.

I suppose it boils down to some Windows setting --
default font, ClearType, theme etc. Maybe even locale.
For example, I use "XP" theme.

Anyway, you can try BGRABitmap (see bgra demo).
It does add additional dependency and some slowdown,
but also has a rich set of graphic effects and primitives,
and is actively maintained.

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JD · 2012-03-03 15:10

Why is there a gap between the base of the bars and the horizontal
axis? Is there a way to remove that gap?

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Ask · 2012-03-03 15:35

QuoteIs there a way to remove that gap?
Yes, by setting Chart.Margins.Bottom := 0.