[Qgis-developer] How to change layer without redrawing the whole map

[Martin Dobias]

On Wed, Nov 2, 2011 at 7:27 AM, Marco Hugentobler
<marco.hugentobler at sourcepole.ch> wrote:
> Hi Jonny
>
> One possibility to handle this is to create a subclass of QgsMapCanvasItem
> to display the car symbols. That way, the QGIS background map is not
> re-rendered if the items change position.

Right. For the start you may use QgsVertexMarker class which is
derived from QgsMapCanvasItem. Simply create it and set (and update)
the position (in map coordinates).

Martin