Andrea,
Many thanks for your feedback, detailing the various drawbacks. Having given
the idea some thought myself while off-line, I reckon the current approach is
good as it is. Indeed, you want point symbols to have the same size
irrespective of the markfactory or font-specific metrics. If you want to use a
font and its metrics, I should use the TextSymbolizer instead.
Kind regards,
Edward
Date: Thu, 2 Aug 2012 09:20:34 +0200
Subject: Re: [Geoserver-users] Character size difference TextSymbolizer vs
PointSymbolizer w/ TTFMarkFactory
From: [email protected]
To: [email protected]
CC: [email protected]
On Wed, Aug 1, 2012 at 8:44 PM, Edward Mac Gillavry <[email protected]>
wrote:
Andrea,
Many thanks for confirming my observations. Your explanation of the inner
workings certainly indicates it is font-specific. If I understand it correctly
in case of the TTFMarkFactory, the first scaling transformation (so the largest
side of the bbox becomes size 1) introduces the seemingly random adjustment
factor?
Would changing the current behaviour introduce any unforeseen/unwanted effects?
From a cartographic design point of view, it would be great to have
these two symbolizers have the same, predictable output size.
Every mark factory is supposed to generate a 1x1 symbol, changing that would
break the current API...
I could go for that, but there is a side effect that is grave: it would
invalidate all exisiting SLD styles
already using this functionality, forcing every user to manually re-adjust
their SLDs on upgrade.
I can see two ways forward if someone wants to code that change:
- make the new behaviour controlled by a global flag, and disabled by default
- add an extra bit in the ttf:// url that disables the rescaling, something
like ttf://myfont#code?rescale=false
I cannot guarantee that would give you exactly the same size though, one thing
is getting
a Font object at size 1, vectorize and rescale, then scale up to the desired
size(the rescaling to the desidered size is done out of the shape factories,
the factories are supposedto give out rescalable vector representations so it's
not their responsibility to match the requested
size), another is asking for a font at a specific size instead.
Cheers
Andrea
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