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QPainterPath path;
path.lineTo(....);
painter->drawPath(path);

painter->setRenderHint( QPainter::Antialiasing );

		QPainterPath path;
		//идем в начальную точку
		path.moveTo(points[0].x/scale*coef,
		        (w_height-points[0].y)/scale*coef);
		//строим все отрезки полигона
		for (int k=0; k<points.size(); k++)
			path.lineTo(points[k].x/scale*coef,
		           (w_height-points[k].y)/scale*coef);

    for (int k=1; k<points.size(); k++)
    {
        path.lineTo(points[k].x/scale*coef, 
                        (w_height-points[k].y)/scale*coef);
        qWarning("dx=%f dy=%f\n", (points[k].x-points[k-1].x)/scale*coef, 
                                                 (points[k].y-points[k-1].y)/scale*coef);
    }

QPolygonF isoline();
.... //заполнение точками
QPainterPath path(isoline[0]);
for (int k=1; k<isoline.size(); k++)
	path.lineTo(isoline[k]);
painter->drawPath(path);

QPolygonF isoline();
.... //заполнение точками
painter->drawPolyline(isoline);