Hi Andrea,
Thanks for the explanation, it's interesting stuff and does make sense
about the bounding boxes; approximations are almost always faster after all.
For now I'll just stick with using SLD 1.0 for the styles where I require
prioritisation. There aren't many.
One little known thing is that the default priority is 1000, so you have to
> go above it.
I did pick that up (why I'm using 2000 and 10,000) - it's neatly documented
though I guess not everyone reads them. ;-)
Thanks again,
Jonathan
On 17 July 2014 05:34, Andrea Aime <[email protected]> wrote:
> 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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> Ing. Andrea Aime
> @geowolf
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>
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