Hi,
Sounds interesting to me. Cartographers would love it! Esp. the dragging
along a line. Sounds like something for QGIS 2.1.
The other thing that bothers me a lot is the efficient (performant)
labeling of banana-shaped polygons ... this would be kind if it could
still be fixed in QGIS 2.0. But I'd be also patient and wait for 2.1 ;-)
Thanks a lot,
Andreas
On 3/5/13 9:16 PM, Larry Shaffer wrote:
Hi,
I have an idea concerning this that was originally cooked up for an
approach to doing multi-line curved labels [0]. I refer to them as
'label anchors,' which would be for line and polygon features (though
they could be handy for point features). The concept is roughly like so:
* An anchor point is sent into PAL that constrains where a single
label candidate is generated. The point could be data defined or a
reference to a calculate-able point, e.g. midpoint, beginning/end,
leftmost/rightmost, nearest point on on line relative to off-line
point, point furthest from extent center, etc..
* With data defined anchors, a map tool could be made that allows the
user to visualize and dynamically move the anchor along a line or even
place the anchor off the line (e.g., over a nearby related feature,
like a building-to-street relationship). This would allow data defined
curved labels to work like moving text along a path in an illustration
program, and allow for precise control over label placement along a
line without forcing full pinning of the label.
* Additional options could be weighting the above/below line labeling
option (for off-line anchors), and quadrant and offset placement of
the label relative to anchor.
There may be other advantages to sending controllable label anchor
points into PAL. This is different than data defined x/y, which
totally skips chosen placement algorithms and essentially treats the
feature geometry as a point. Right now it is just conceptual, and I'd
like to hear some feedback.
Regards,
Larry
[0] http://hub.qgis.org/issues/4442
On Tue, Mar 5, 2013 at 12:24 PM, Andreas Neumann <[email protected]
<mailto:[email protected]>> wrote:
Hi,
So this sounds like its not happening any time soon. Definitely
after QGIS 2.0
In this case I will do a helper layer and restrict that line using
linear referencing. My data is in Postgis and I can use its linear
referencing functions.
For the long run I would want to get rid of that helper layer and
find a QGIS only solution.
Thanks for your reply!
Andreas
On 3/5/13 8:13 PM, Martin Dobias wrote:
Hi Andreas
On Tue, Mar 5, 2013 at 2:20 PM, Andreas Neumann
<[email protected] <mailto:[email protected]>> wrote:
Hi,
Maybe Larry, Martin or Marco can answer this:
I am looking for the possibility to label a line at the
start or end (plus a
given offset from start/end). As far as I know this is not
yet possible now?
Does PAL support this and is it a matter of exposing this
option in the GUI
or is this not yet supported at all?
That's not supported as far as I know. It would be handy to have a
functionality in PAL that would allow us to constrain where
the label
candidates should be created and how they should be
prioritized. That
would also allow us to decide where to put labels for point
features
and which positions are preferred.
Martin
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