[Qgis-developer] Editing the geometry of a feature
roger.tait at ntu.ac.uk
Mon Oct 22 09:15:35 EDT 2007
I have a QGis::WKBPoint based vector layer containing a single feature.
I want to change the position of the feature using a single click of a button embedded in the tool bar.
I have unsuccessfully tried to change the position using the following:
QgsFeature *feature = pointLayer->getFirstFeature(true,false);
QgsGeometry *geometry = feature->geometry();
unsigned char *wkb = geometry->wkbBuffer();
memcpy(&wkb, &newPosX, sizeof(double));
memcpy(&wkb+sizeof(double), &newPosY, sizeof(double));
The correct feature and geometry are referenced however for some reason the new position is lost before the feature is drawn to screen.
I have also tried commitAttributeChanges(const std::set<QString>& deleted, ... ,std::map<QString,QString> >& changed); without success.
Please tell me how I can change the position of a feature?
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