Sorry, It's my bug. > I have found a problem at drawing QgsMapCanvasItem. > At drawing > void QPainter::drawPolygon ( const QPolygon & points, Qt::FillRule > fillRule > = Qt::OddEvenFill ); > and > void QPainter::drawPolyline ( const QPolygon & points ); > if the first points of QPolygon are not visible nothing is drawn. >