[Qgis-developer] Re: New Symbology : merge borders on nodes for lines

[kimaidou]

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.sk at gmail.com>

> On Thu, Feb 17, 2011 at 1:33 PM, kimaidou <kimaidou at gmail.com> wrote:
> >
> > 2011/2/17 Carson Farmer <carson.farmer at 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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