[Qgis-user] Drawing over lapping polygons from postgis vector data table.

[Andreas Neumann]

Hi Dave,

There is no guaranteed drawing order for features within a layer.

However, to see all objects that are on top of each other you can use 
"feature blending mode multiply", potentially combined also with a layer 
blending mode of multiply (see bottom of style dialogue).

Then objects would shine through and the color would get darker where 
there are more objects on top of each other. See the attached image to 
see the effect.

Hope this helps,
Andreas

On 13.11.2014 10:34, Dave Potts wrote:
> Hi
>
> I am trying to display the results of a spatial analysis, the return 
> form is a set of polygons of increasing size. All located on top of 
> each other.  I want to draw it, so it looks like a target, but all 
> that happens is that the largest polygon is drawn last which blocks 
> out all of the others.  Is there an easy way of display the result?
>
> I can not see any way of using an outside function so that the largest 
> polygon would be drawn firsts with the next polygon drawn on top of it.
>
> Since its an import from a postgis table every does have an unique id.
>
> regards
>
>
> Dave.
>
>
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