pen.setJoinStyle(Qt.MiterJoin) symbol = QwtSymbol() symbol.setPen(pen) symbol.setBrush(Qt.red) symbol.setPath(path) symbol.setPinPoint(QPointF(0.0, 0.0)) symbol.setSize(10, 14) # --- Test it within a simple plot --- curve = QwtPlotCurve() curve_pen = QPen(Qt.blue) curve_pen.setStyle(Qt.DotLine) curve.setPen(curve_pen) curve.setSymbol(symbol) x = np.linspace(0, 10, 10) curve.setData(x, np.sin(x)) plot = QwtPlot() curve.attach(plot) plot.resize(600, 300) plot.replot() plot.show() plot.grab().save( osp.join(osp.abspath(osp.dirname(__file__)), "images", "symbol_path_example.png")) app.exec_()