[Qgis-developer] Problems with reprojecting to mercator

[hubbatov]

Ok, how can i set extent to layers extent?

	QgsApplication a(argc,argv, true);

	QgsProviderRegistry::instance("/usr/local/lib/qgis/plugins");
	a.setPkgDataPath(QDir::homePath() + QDir::separator() + ".harver/");

	QgsMapCanvas *canvas = new QgsMapCanvas(0, 0);
	canvas->enableAntiAliasing(true);
	canvas->useImageToRender(false);
	canvas->setCanvasColor(QColor(255, 255, 255));
	canvas->freeze(false);
	canvas->setVisible(true);
	canvas->refresh();
	canvas->show();

	QgsCoordinateReferenceSystem pseudo_mercator(3857,
QgsCoordinateReferenceSystem::PostgisCrsId);
	QgsCoordinateReferenceSystem wgs84_4326(4326,
QgsCoordinateReferenceSystem::PostgisCrsId);

	canvas->mapRenderer()->setProjectionsEnabled(true);
	canvas->mapRenderer()->setDestinationCrs(pseudo_mercator);
	canvas->mapRenderer()->setMapUnits(pseudo_mercator.mapUnits());

	QgsVectorLayer *layer = new
QgsVectorLayer("/home/xumuk/shapes/fields_r.SHP", "fields", "ogr");
	QgsSingleSymbolRenderer *renderer = new
QgsSingleSymbolRenderer(layer->geometryType());
	layer->setRenderer(renderer);
	layer->setCrs(wgs84_4326);
	layer->updateExtents();

	QgsMapLayerRegistry::instance()->addMapLayers(QList<QgsMapLayer*>() <<
layer);

	QList<QgsMapCanvasLayer> layerSet;
	layerSet.append(QgsMapCanvasLayer(layer));
	canvas->setExtent(layer->extent()); <====== here i have degrees, but i need
to set extent in pseudo_mercator.mapUnits
	canvas->setLayerSet(layerSet);
	canvas->refresh();




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