On Mon, Jul 14, 2014 at 5:03 PM, Jonathan Moules <
[email protected]> wrote:
> But throw in the other text layer:
>
> http://maps.warwickshire.gov.uk/gs/wms?LAYERS=OS_VML_ROADCENTRELINE,
> *OS_MM_CARTOGRAPHIC_TEXT*
> &STYLES=&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG%3A27700&BBOX=428428.71093752,264954.34570313,428618.8964844,265128.17382813&WIDTH=779&HEIGHT=712
>
> Of course, the weird thing again is as you can see, there's plenty of
> space for the label to be placed down the middle of the street (which is
> where it's placed much of the time):
> [image: Inline images 1]
>
>
Ah, there is plenty of space yes, but the labelling engine has a space
reservation system that is pretty simple,
it uses the axis aligned bounding box of the label to reserve and check
so... a diagonal label takes
a _lot_ of extra space
This is done for performance reasons, as checking intersections between
randomly rotated bounding
boxes (and for curved labels, funny curved worms) would be much more
intensive.
I had some thoughts about switching from rectangle based to "raster" based,
to account more or less
for the actual space used by the labels, but the funding to do this kind of
switch never materialized
Cheers
Andrea
> Is it still worth opening a JIRA or is this just some bad-luck with
> centroids and placement of text in relation to other text? (the other text
> only has "conflictResolution = true" as its vendorParameter).
>
> Assuming my understanding of layer render ordering is valid, the road text
> is rendered first, though I seem to remember labelling is something of a
> special case.
>
Yes, all labels are rendered at the end, so if you assign a high priority
to some labels, they should be rendered
before the others regardless of the layer order.
One little known thing is that the default priority is 1000, so you have to
go above it. Don't know why 1000 was chosen,
that was done by, I believe, David Blasby, many many years ago
Cheers
Andrea
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