Andrew,
Some options (the horizontal and vertical alignment, maybe also
rotation) only works after you assigned a x/y coordinate data column.
QGIS needs to know from which point it needs to offset and rotate - with
automatic labeling this is not defined.
Andreas
On Fri, 25 Mar 2011 11:21:42 -0000, Andrew Chapman wrote:
Thanks for the feedback Andreas. I'll try just to use the "ABC" tool
from
now on - I realise that it is still in development, so my comments
aren't
criticism, just trying to understand how the tool is intended to work
and
where its development is at the moment.
So for a point shapefile, starting with "Label this layer" checked
and an
appropriate attribute selected for "Field with labels", no buffering
and "In
map units" selected, I then get text displayed as I would expect. I
can
change font, colour and size. However, when I start to experiment
further,
things get a little more complicated. If I set the size to zero
(limit case
test) and then "Apply", there are no complaints about the value but
the
on-screen text doesn't change. If I exit the dialog and return, the
last
accepted value has returned, so this would seem to be a very minor
bug.
Playing around the limit, I found that 0.0001 map units works ok, so
for my
metric CRS this equates to a text height of 0.1 mm - I could even
zoom in
from the whole world to labels on individual PCB tracks in my PC at
that!
The next step was using "Data defined settings" with a more realistic
range
of sizes defined by attribute and the placement set as "over point".
This
generally worked as expected, except that the "Label settings->Size"
value
changes the vertical placement of the label, in my case by
approximately 0.2
* value - I had expected this control to do nothing in these
circumstances.
As an aside, I didn't really understand most of the settings on the
"Advanced" tab, including the difference between "around point" and
"over
point".
I tried the "Data defined. color" and it worked with the described
#rrggbb
where rr, gg, bb are two hex digits for colour. However, before
getting your
response I tried the simple text string "red". and got red text! It
would
seem that there are also some pre-defined (English only?) colours.
Bold, italic, underline and strikeout all work as boolean values with
Null
and zero equating to False and (as far a I can see) any other value
equating
to True.
Font family works ok with any recognised font family name. Any values
that
aren't recognised are ignored and the font family defined on the
"Label
settings" tab is used instead.
To get buffering to work, it appears that "Buffer" has to be checked
on the
"Label settings" tab to get either normal or data defined buffering.
The
buffer size is shown in mm, although this doesn't relate to the map
units
used (metres in my case). As I zoom in and out, my labels (in map
units)
scale, but the buffer remains constant.
Buffer colour uses the same format as font colour.
I didn't try label distance and X & Y coordinates.
Horizontal and vertical alignments are currently inactive.
Rotation similarly is inactive. Unless I'm missing something, the
only way
that I can use the rotation attribute in my data is to go back to the
old
style.
Andrew
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--
--
Andreas Neumann
Böschacherstrasse 10A
8624 Grüt (Gossau ZH)
Switzerland
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