hello,
When I first loaded a map,I want to display a part of map,I used
Qgsmapcanvas.setextent(),
But the map didn't change. The following code:
QgsMapLayerRegistry::instance()->addMapLayer(Layer);
mapCanvasLayerSet.append(Layer);
mapCanvas->setLayerSet(mapCanvasLayerSet);
mapCanvas->setVisible(true);
QgsRectangle r(0, 0, 800, 800);
mapCanvas->setExtent(r,true);
mapCanvas->setCachingEnabled(true);
mapCanvas->refresh();
How to use setextent,I could not understand this,and how to display a part of
map,Can you tell me ?
Thanks for help!!
tong
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