QuantumGIS 2.6.0 (Windows 7 64-bit)

I have created a PostgreSQL POLYGON as WGS84 (CRS EPSG:4326). The polygon is a series of points around (but not actually on) the edge of the map. This is a rectangle (see the first image below).

POLYGON((-179.9 -89.999,-179.8 -89.999,-179.7 -89.999...), 4326

I have changed the CRS 'on the fly' to World Robinson (CRS ESRI:54030). In the previous version of QGIS this would now display my polygon as the racetrack shape of the Robinson projection. In QGIS 2.6 the correct shape is only displayed when I toggle 'Toggle Editing'.

I believe that only the extreme points are being displayed, until I toggle editing, when it is using all of the points. I have also observed this behaviour in linestrings.

Why is this, and how can I get my desired behaviour? Any help gratefully received!

Update The polygon starts to render correctly as you zoom in.

Polygon (no editing)

Polygon (with editing toggled)


Try turning off the automatic simplification for the layer:

  1. Right click the layer and select "Properties"
  2. Click the "Rendering" tab
  3. Uncheck "Simplify geometry"

This feature can cause issues with certain projections, and I suspect that's what you're encountering.


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