Thanks Martin for your explanation ! I know understand why and how activating "symbol levels" has an effect of the rendering of my linestrings :)
As you have seen, I am no native english speaker, so I am not able to help find the proper vocabulary. (I do not like substyle any more :) ) We need to look at Mapserver, OpenLayers, GeoServers, SLD cookbook to find which terms they use, IMHO. Kimaidou 2011/2/17 Martin Dobias <wonder...@gmail.com> > On Thu, Feb 17, 2011 at 1:33 PM, kimaidou <kimai...@gmail.com> wrote: > > > > 2011/2/17 Carson Farmer <carson.far...@gmail.com> > >> > >> Perhaps 'Symbol layer ordering' or simply 'layer order'? > > > > I dislike "layer order" as it is confusing : do we speak of layers from > the > > canvas ? Or "style" layers ? > > For me we should use the term "layer" in Qgis only for vector and raster > > layers > > Frankly, with the introduction of symbology-ng I have created some > mess in the terminology and I am not sure how to get out of this. > Where are the problems: > - "style" - before the style referred to Layer style (i.e. renderer, > labeling). symbology-ng uses this term for a collection of symbols > (and other visual items) > - "color ramp" - a convenient source of colors for symbology-ng. > Shouldn't that be called a "colormap" since it could be either a color > gradient, colors from a palette or just a bunch of random colors? > - "layer" - there are map layers and there are symbol layers. I think > that generally speaking, a layer always means a map layer. > - "categorized" / "graduated" renderer - I remember Carson raising the > discussion that these terms are not very clear > > An insight from a english native speaker and preferably a user of > several GIS would be valuable. It would be good to disambiguate the > terms. > > > > Shouldnt we use a different terme for styles within one vector layer ? > > We could name them "substyles" > > This way "Symbol Levels" would become "substyle order" > > Personally I do not like the term substyle order. > > > > So correct me if I am wrong, but you can define the order with 2 > different > > manners : > > * A/ use the arrows in [1] (left side of the ui) to change the order of > the > > different styles > > * B/ click on "symbol levels" and change the integers in the table : this > > 2nd manner overwrite the first, no ? > > No, it is more complex. Normally when a renderer renders a map layer, > for each feature it renders symbol layers one by one and proceeds to > another feature. By enabling symbol levels you tell the renderer that > it should first render first symbol layer of each feature and then > render second symbol layer of each feature. The numbers in the symbol > level table tell in what pass a symbol layer will be drawn (smaller > number = drawing earlier). > > This probably needs a better introduction in a blog post or > documentation with examples. > > Martin >
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