[Qgis-developer] Python plugin: how to set a symbol for a layer?

[luca_manganelli at comune.trento.it]

Hi,

I've searched across documentation and mailing list, but I didn't found a
page explaining how to set a symbol.

For example:

  - point layer: I want to use a circle with width 0.5 and gray colour with
black border;
  - line layer: width 1 and continous green line

any hint?

Thank you in advance.