Sebastian Spaeth wrote:
On 2010-07-11, Sebastian Klein wrote:
Sebastian Spaeth wrote:
Question: You say that subpart styles override generic style even if it
comes later in the file. And the line
way [highway]::*
suggests that it applies to all subparts and consequently overrides them
all if it comes later in the file. But you write it is synonym to "way
[highway]", could you clarify?
Well, I just made ::* be a synonym for the generic case for now. And
generic rules never override rules for specific subparts. But that is
mainly just to make my implementation easier. I agree that ::* should
probably override things too.
Btw., it could be useful to be able to override style for all subparts:
E.g. override the anti-aliasing for efficiency or make everything
transparent (by a certain factor (?)), ...
?
Can you give an example? Like this:
way [highway]::centerline {bezier:yes;}
way [highway]::highlight {bezier:yes;}
way [highway]::* {bezier:no;}
E.g. you have a large and nice standard style file. But then you simply
want to show motorways on half transparent map:
[...] standard styles [...]
node::*, way::*, relation::* { opacity: eval(0.1 * prop(opacity)); }
way[highway=motorway] { opacity: 1; width: eval(1.4 * prop(width));
z-index: 100; }
(The example is a little artificial, but maybe you get the idea.)
What is
way [highway]::
'::' is just another specific subpart. I wrote that to make sure that no
one things that:
way [highway]::
overrides
way [highway]::centerline
because (in my implementation) it does not.
This is all open to discussion of course.
Sebastian
I implemented it a little different. The approach is described on the wiki:
http://wiki.openstreetmap.org/wiki/Talk:MapCSS/0.2
It took a view iterations, but I think it is now better than my initial
draft.
What do you think?
Sebastian
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